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News from the chair NTFD
Within the scope of the NTFD-seminar current research themes will be presented. The series of lectures will begin on 03.03.2014 at 10:00 in room DBI 304 and will proceed biweekly. The topics are available under following link PDF.
All interested persons are kindly invited!
Sebastian Popp, M.Sc. joined the Chair of Numerical Thermo-Fluid Dynamics at 02/03/14. In his research, he will perform Large Eddy Simulations (LES) for combustion of hydrogen, mixtures of hydrogen and natural gas and also syngases.
Martin Pollack, M.Sc. joined the Chair of Numerical Thermo-Fluid Dynamics at 01/06/14. In his research, he will perform simulations of spray combustion using flamelet modeling. This work is in direct continuation of his master thesis.
Thesises and student research projects updated
The topics for thesises and student research projects of the chair NTFD has been updated. Interested persons should directly contact the responsible persons.
Frank Hartmann, M.Sc., joined the Chair of Numerical Thermo-Fluid Dynamics at 12/02/13. In his research, he will perform simulations of internal combustion engines. This work is in direct continuation of his master thesis.
Klaus Hildebrandt, M.Sc., joined the Chair of Numerical Thermo-Fluid Dynamics as research associate at 12/02/2013. He will focus on simulations of coal conversion processes. This topic represents a continuation of his master thesis.
Visit of Prof. Dinkelacker
On 06.12.2013, Prof. Dinkelacker and his workgroup from Leibniz University Hanover (Institute for technical combustion) will visit the university of Freiberg. It is planned to have a casual get together, some lectures about the institutes in general as well as specific working areas. Furthermore a lab tour by the chair of gas and heat technology as well as the chair of reaction engineering will take place.
Presentation Prof. Olaf Deutschmann
On thursday, 11/22/2013 at 14:30 , Prof. Olaf Deutschmann from the Institute for Technology and Polymer Chemistry of the Karlsruher Institute of Technology will present the topic "Catalytic reformation of fuels into hydrogen". (PDF) All interested ones are kindly invited to follow this event. The presentation will be given in German language.
Defense of master thesises
At the chair of NTFD will be interesting defenses around the turn of the year:
- 11/28/13 at 10:30: Frank Hartmann, B.Sc.,
"3D-CFD-Simulation of internal combustion engines using the ANSYS-CFX ICE-process" (Room: DBI_304)
- 12/13/13 at 09:00: Stefan Frommater, B.Sc.,
"Simulation of the Three-Way Catalyst Conversion Behavior on Engine Test Benchs and in the European Driving Cycle" (Room: DBI_201)
- 12/19/13 at 15:00: Martin Pollack, B.Sc.,
"Development of a tabulation based Flamelet progress variable approach to model auto-ignition in non-premixed flames" (Room: DBI_304)
- 12/20/13 at 9:00: Markus Hempel, B.Sc.,
"Quantitative analysis of spatial discretization for flow simulation using scale-resolving models" (Room: DBI_304)
- 01/09/14 at 9:00: Sebastian Popp, B.Sc.,
"Simulation of combustion in a rotating combustion chamber" (Room: DBI_304)
- 01/09/14 at 11:00: Erik Göhler
"3D-CFD Simulation for the validation and optimisation of SCR-mixer" (Room: DBI_304)
The presentations will take place in the DBI-building, Reiche Zeche, Fuchsmühlenweg 9 (rooms shown in the listing). All interessented persons are kindly invited to follow this events..
Virtuhcon Status Seminar
Upcoming thursday (2013/11/14) the researchers of the centre „Virtual High Temperature Conversion (ZIK Virtuhcon)“ will show the current research work at a status seminar. The event will take place at the institute of "Energy Process Engineering and Chemical Engineering" in the DBI-building (Room: DBI_318). All interested persons of the TU Bergakademie Freiberg are invited to discuss current issues of modeling and simulation of high temperature conversion processes. For further informations about the program of the status seminar visit the homepage www.virtuhcon.de (News).
Presentation Martin Votsmeier
On Friday, 08. November 2013, a presentation will be given by Martin Votsmeier from Umicore AG & Co. KG on the topic of "Detailled Physical-Chemical Models as a Development Tool for Technical Catalyst Systems in Automotive Exhaust-Gas Cleaning". The talk will be especially about the roll of simulations as a tool in the development process of of modern exhaust-gas aftertreatement systems and novell catalyst materials. Additional information can be found in the attached PDF. All the interested ones are kindly invited! The presentation will be given in German language.
Michael Gauding is a new employee at chair NTFD. His field of research is the DNS of turbulent flows at high performance comuters. Until September 2013 he works at the Cluster of Exellence "Maßgeschneiderte Kraftstoffe aus Biomasse" at the Institute for Combustion Technology at RWTH Aachen.
New ESF-Research Group
Beginning in October the new ESF funded research group "Dynamik der katalytischen Schadstoffreduktion zur emissionsoptimierten Realisierung der dieselmotorischen CO2 Potentiale" (DynMo) will engange in research concerning the pollutant reduction of modern Diesel engines. At the Chair of Numerical Thermo-Fluid Dynamics four scientists will participate in this project. DynMo is a joint project of the Chairs of Numerical Thermo-Fluid Dynamics, Reaction Engineering and Gas and Heat Technology. The project is supported by the state of Saxony and the European Social Fund with 1.5 million Euro. For further reading: medienservice.sachsen (in German language).
Miriam Rabaçal from Instituto Superior Técnico de Lisboa (IST), Portugal, will join the chair of Numerical Thermo-Fluid Dynamics in Freiberg for a short term scientific mission (STSM) during 3 months starting September 2013, under the COST Action framework. Miriam Rabaçal works on LES of large-scale biomass and coal co-firing in collaboration with Professor Andreas Kempf from Duisburg-Essen UniversitÃ¤t, for which an accurate description of biomass conversion processes is necessary. The STSM project aims to create a bridge between detailed network pyrolysis models and less expensive algebraic pyrolysis models for usage in LES. Models like bio-FLASCHAIN, bio-CPD and FG-Biomass will be used to obtain detailed pyrolysis data over a broad range of conditions validated with experimental data from IST. Data will be subsequently fitted to algebraic models for coupling with LES models.
NTFD officially announced ANSYS Partner
The chair NTFD is now official ANSYS partner. The partnership will enhance the already very active collaboration in the CFD area. In addition to the direct contact with the developement team, ANSYS provides NTFD with academic licenses. These licenses are used for highly-parallel simulations of turbulent flows.
In the last week, two papers were accepted for publishing:
- Peter Keller, Andre Bader, Christian Hasse: "The influence of intra-droplet heat and mass transfer limitations in evaporation of binary hydrocarbon mixtures", International Journal of Heat and Mass Transfer.
An advanced droplet model including the species and temperature gradients along the radius is compared with one with rapid internal mixing. The influence of ambient conditions as well as mixture composition is investigated in detail and measured with a segregation factor introduced in this work, which gives an information whether the evaporation of different species proceeds simultaneously or separated.
- Uwe Prüfert, Franziska Hunger, Christian Hasse: The analysis of chemical time scales in a partial oxidation flame, Combustion and Flame.
the paper deals with time scales of chemical reactions at different zones within a partial oxidation flame. Two Algorithms known from literature and two algortims developed in the paper are compared. As one result, it is shown that algorithms based on eigenvalue analysis give the best results, but the numerical costs differ significantly. Here, our two new algorithms give comparable results by lesser numerical costs.
Conferences in September
In the next week members of NTFD group will present their work at conferences.
- Martin Ullmann will present the poster "Application of Proper Orthogonal Decomposition Methods in Reactive Pore Diffusion Simulation" at 3rd International Symposium on Modeling of Exhaust-Gas After-Treatment (MODEGAT III) from Sept. 8-Sept. 10. in Bad Herrenalb (Germany).
The related paper (authors Ullmann, Prüfert, Ernst, Hasse) will be published in an extra issure of "Canadian Journal of Chemical Engineering".
- Sandra Hartl will present the poster "Numerische und experimentelle Untersuchungen der laminaren Brenngeschwindigkeit von ethanolhaltigen Brennstoffen" (Hartl, Rau, Voss, Trimis, Hasse) at the "26th Deutscher VDI Flammentag", which is held from Sept. 11th-12th at University Duisburg/Essen.
- Also at "Flammentag", Franziska Hunger will held a talk about "Gekoppelte Flamelet-CFD Simulation der Hochdruck-Vergasung unter besonderer Berücksichtigung des Strahlungseinflusses in optisch dichten Medien".
- Steffen Salenbauch will give a talk at 4th COST annual meeting held 9/16 - 9/18/2013 in Perugia titled "Numerical and Experimental Investigation of Soot Formation and Particle Size Distributions in Laminar Premixed Flames" (authors Salenbauch, Frenzel, Trimis, Hasse).
PhD. Defense at Chair NTFD
Dipl.-Ing. Dirk Linse successfully defended his PhD. thesis "Modeling and Simulation of Knock and Emissions in Turbocharged Direct Injection Spark Ignition Engines" on June 21st. First advisor was Prof. Dr.-Ing. Christian Hasse (TU Bergakademie Freiberg), second examiner was Prof. Dr.-Ing. Ulrich Spicher (Karlsruher Institut für Technologie).
Paper on entrained flow gasification accepted for Fuel
The paper "Simulation of entrained flow gasification with advanced coal conversion submodels. Part 1: Pyrolysis" (Authors Vascellari, Arora, Pollack, Hasse) was accepted today for publication in the peer-reviewed journal Fuel (Impact Factor 3.248). This particular publication reports important research results obtained by the Reactive Flow Systems Group (RFS) at the ZIK Virtuhcon. It is noteworthy that it took only two months from the first submission to acceptance, which is unusually fast for Fuel. All three reviewers asked only for minor revisions.
Paper on flamelet curvature correction accepted for Combustion and Flame
The paper "A Consistent Flamelet Formulation for a Reacting Char Particle Considering Curvature Effects" (Authors Xu, Hunger, Vascellari, Hasse) was accepted today for publication in the peer-reviewed journal Combustion and Flame (Impact Factor 3.585). New flamelet equations, which include the effect of tangential (meaning tangential to the iso-mixture fraction surface) diffusion of species and enthalpy, are derived and validated against fully resolved (DNS) calculations. The new transport terms can be modeled as curvature terms of the mixture fraction and the respective scalar.
Lectures Introduction to Asymptotic Analysis of Reactive Flows scheduled
In the week June 17th to 21st 2013 the chair of numerical thermo-fluiddynamics will host a lecture series with the title Introduction to Asymptotic Analyses of Reactive Flows. Guest lecturer is Professor K. Seshadri (University of California San Diego). He has nearly 40 years experience in this particular field and is author of numerous publications concerned with asymptotic analysis
Paper on modeling bicomponent droplet evaporation accepted for Journal of Heat and Mass Transfer
The paper "The influence of non-ideal vapor-liquid equilibrium on the evaporation of ethanol/iso-octane droplets" by A. Bader, P. Keller, C. Hasse was accepted for publication in the Journal of Heat and Mass Transfer .
NTFD joined COST Action CM0901
Since 24.04.2013, the chair NTFD is a member of the COST Action CM0901: Detailed chemical kinetic models for cleaner combustion. The aim of this European research cooperation is the development and implementation of improved chemical combustion models.
The overall project is divided into 5 working groups, whereas the NTFD will participate in working group 3: "PAHs and Soot".
To learn more about visit
Lecture Courses in Summerterm 2013
Offered by Chair NTFD:
For students in the master's programme "Verfahrenstechnik" offered by IEC/Virtuhcon:
- Prof. Hasse: Strömungs- und Temperaturgrenzschichten. Lecture: Thursday, 18:30-20:00 h, Room WEI-0120. Tutorial: Mondays of even weeks, Room WEI-1116.
- Dr. Prüfert: Fortgeschrittene Methoden der Programmierung in Matlab. Lectures at Thursday, 7:30-9:00 h. Room WEI-0120, Tutorial: Wednesdays of odd weeks, 18:30-20:00 h, Computer pool at Reiche Zeche.
All Courses are in German language.
- Dr. Raatz: Grenzflächenverfahrenstechnik I, Wednesday, 9:30-11:00 h Room RAM-2220
Dirk Dietzel will support the chair from March to May 2013 as scientific assistant. He will continue his work on turbulent inflow generation methods for Large Eddy Simulation of turbulent flows
The paper "An Abstraction Layer for efficient memory management of tabulated chemistry and flamelet solutions" by S. Weise, D. Messig, B. Meyer, C. Hasse, a collarboration between the chairs NTFD and EVT was accepted to publish in Combustion Theory and Modelling .
Paper on inverse diffusion flames accepted
The paper "Development of an inverse diffusion partial oxidation flame and model burner contributing to the development of 3rd generation coal gasifiers", which is the result of a collaboration between the chair NTFD and the chairs EVT (Prof. Meyer) and GWA (Prof. Trimis) was accepted for publication in Fuel Processing Technology. This work illustrates the importance of the partial oxidation flame developed in Freiberg, see also previous publications in Proceedings of the Combustion Institute and Flow Turbulence and Combustion for the development of gasification processes.
A. Scholtissek started as PhD student
On January 1st 2013 A. Scholtissek, MSc. started as a PhD student at the chair of Numerical Thermo-Fluid Dynamics. He will work on multidimensional flamelet modeling of coal/biomass combustion and gasification. This work is a direct continuation of the research performed during his master thesis where he investigated the scalar dissipation rate profiles for coal particles during pyrolysis.
Invited Lecture at the von Karman Institute on modeling of coal
Prof. Hasse was invited to give a lecture on "Modeling of Coal Combustion and Gasification" at the von Karman Institute in Brussels as part of the VKI Lecture Series "Turbulent Combustion". This confirms again that there is increasing interest within the research-oriented combustion community in the topic of modeling of chemically reacting flows with coal as feedstock. This connection between the combustion and the gasification communities was already foreseen the in the Virtuhcon strategy concept.
Minisymposium on coal modeling and 7 contributed presentations accepted for 2013 Siam Conference on Numerical Combustion
For the 14th International Conference on Numerical Combustion from 8.4.-10.4.2013 in San Antonio, the chair of Numerical Thermo-Fluid Dynamics organizes in cooperation with the University Stuttgart and the University Duisburg-Essen a minisymposium on "Coal Combustion and Gasification: From Fundamental Processes to Technical Applications" split in 2 sessions with 4 oral presentations each.
- CFD Modeling of Radiation Effects in a Partial Oxidation Flame Including Optically Thin and Dense Regions
- Flamelet Modeling of Radiation Effects in a Partial Oxidation Flame
- Flamelet Modeling of High Pressure Partial Oxidation
- Comparison of Inflow Generation Methods for LES of Turbulent Flames
- A Comparative Study of Large Eddy Simulations of a Pulverised Coal Jet Flame
- DNS of turbulent oxy-fuel flames ï¿½ effects of differential and thermal diffusion
- Influence of Chemical Pyrolysis Product Composition on Coal Particle Ignition
M. Ullmann started as PhD student
On Dec. 15th 2012 M. Ullmann, MSc. started as a PhD student at the chair of Numerical Thermo-Fluid Dynamics. He will work on the developing and applying software for the simulation of heterogeneous catalysis. This work is a direct continuation of the research performed during his master thesis, which is tightly coupled to the experimental work conducted at the chair of reaction engineering (Prof. Kureti) within the project BioRedKat
New employee: Stefan Buhl
Stefan Buhl joined the Chair of Numerical Thermo-Fluid Dynamics beginning of 1th December 2012. In his research he will study the Large Eddy Simulations of Flows.
At the chair NTFD four new positions starting in March 2013 are offered. For details see NTFD open positions.
Paper on Large Eddy Simulation of Pulverized Coal Flames accepted for publication in Flow, Turbulence and Combustion
The paper "Towards comprehensive coal combustion modelling for LES", which is the result of a collaboration between the chair NTFD/Virtuhcon and the universities in Stuttgart, Duisburg-Essen and Imperial College London, was accepted for publication in Flow, Turbulence and Combustion. The work is an important step in the Virtuhcon project to model and simulate coal conversion with sophisticated models. The paper will appear in a special issue "Gasification", which is directly linked to the 1st ERCOFTAC Conference on Multiphase Flows in Gasification and Combustion, which was organized by the Virtuhcon centre.
Paper on Flamelet Radiation Modeling accepted for Combustion and Flame
The paper "Evaluation of Radiation Modeling Approaches for Non-premixed Flamelets Considering a Laminar Methane Air Flame" by D. Messig, F. Hunger, J. Keller, C. Hasse was accepted for publication in Combustion and Flame . In this paper, several methods were investigated to account for radiation losses in flamelet structures and to quantify their effect on the temperature and species profiles. Considering radiation effects is especially important in gasification/POX flames and in general when pure oxygen is used as oxidizer (oxy-fuel). Due to the high flame temperatures, significant heat losses occur, which are partially reabsorbed in the optically thick post-flame/gasification zone. Guidelines were developed in the paper how to account correctly for this heat redistribution in a flamelet context.
The developed methodology is a significant step forward in the virtualization of high temperature conversion/gasification processes. Further information can be requested by authors.
New class "Introduction to Kinetic Theory of Gases"
Starting this winter semester, the NTFD chair offers the class "Introduction to Kinetic Theory of Gases" with 5 ECTS points. In contrast to the macroscopic point of view, which considers gases as a continuum, a molecule-based methodology is applied here. Starting from a simplified description, the connection between thermodynamic quantities such as the temperature with the movement of molecules is established. Further contents of the class are: general distribution functions, the Maxwell distribution for equilibrium, the Boltzmann equation and the derivation of the Navier-Stokes equations from the Boltzmann equation, the latter connecting the microscopic and the macroscopic approaches. Finally, an introduction to Lattice-Boltzmann methods is given.
16. 7. 2012
New Reseach Associate at Chair NTFD
Steffen Salenbauch joined the Chair of Numerical Thermo-Fluid Dynamics beginning of 16th July 2012. In his research Steffen Salenbauch will work on modelling of soot in model flames and gasoline engines.
13. 7. 2012
First Phd. Defense at Chair NTFD
Dipl. Ing. Sebastian Grasreiner is the first Phd student who has successfully defensed his thesis "Combustion modeling for virtual SI engine calibration with the help of 0D/3D methods." at the chair NTFD. Sebastian Grasreiners work was supervised by Prof. Dr. Christian Hasse (TU Bergakademie Freiberg) and Prof. Dr. Michael Wensing (FA Universität Erlangen).
Update: Two contributions for the International Symposium on Combustion accepted
Two contributions were accepted for oral presentation at the International Symposium on Combustion, which will take place form July 29th to August 3rd in Warsaw (Poland).
Both papers were also accepted for publication in the Proceedings of the Combustion Institute
- Stelzner, B., Hunger, F., Voss, S, Keller, J. Hasse, C., Trimis, D.: Experimental and Numerical Study of Rich Inverse Diffusion Flame Structure.
- Vascellari, M., Xu, H., Hasse, C.: Flamelet Modeling of Coal Particle Ignition
Further information concerning the research results are available from the authors.
Invited Talk on coal gasification modeling with flamelets on Norbert Peters's celebratory colloquium
Christian Hasse will give an invited presentation on the celebratory colloquium on the occasion of the 70th birthday of Prof. Dr. Norbert Peters in Aachen on July 10th-11th. The title of the presentation will be "Flamelets brush up Coal Combustion and Gasification". Recent results on the development of flamelet models for coal combustion and gasification will be shown. This research was performed at the Virtuhcon centre.
Indian Students arrived for summer research internship
Two indian students, Rishabh Gupta and Rahul Arora, will stay from middle of May to beginning of August at the chair of Numerical Thermo-Fluid Dynamics. Both young researchers studied at the Indian Institute of Technology (IIT) Delhi und were supervised by Prof. Prabal Talukdar. They will work on the simulation of coal gasifiers using advanced models for the char burnout (Rahul Arora) and the flamelet simulation of the coal particle ignition considering complex pyrolysis kinetics (Rishabh Gupta). The contact to the IIT was initially established by the advisory board member Prof. Franz Durst and Prof. Dimosthenis Trimis.
Training Session at 7th OpenFOAM Workshop
A two hours training session in advanced applications will be held at the 7th OpenFOAM Workshop in Darmstadt:
Keller, P.: A deeper look into Lagrangian spray source code - information for case setup and model development
In this training the comprehension of OpenFOAM source code will be taught to make Lagrangian case setup and model development easier.
Three contributions for the 7th OpenFOAM Workshop accepted
Three contributions were accepted for oral presentation at the 7th OpenFOAM Workshop, which will take place form June 25th to June 28th in Darmstadt.
Further information concerning the research results are available from the authors.
- Messig, D., Fuest, F., Dreizler, A., Hasse, C.: Modeling of laminar partially premixed dimethyl ether flames using detailed chemistry and transport approaches
- Weise, S., Messig, D., Hasse, C., Meyer, B.: Managing large scientific database files in OpenFOAM using a memory abstraction layer (MAL)
- Stein, O., Olenik, G., Kronenburg, A, Ghiani, M., Vascellari, M., Hasse, C., Franchetti, B., Cavallo Marincola, F., Kempf, A.: LES of a pulverised coal jet flame: OpenFOAM vs. Competitors
Two NTFD papers on 9th European Conference on Coal Research and its Applications
The following tow papers will be presented at the 9th European Conference on Coal Research and its Applications at the University of Nottingham 10-12 September 2012: "The Influence of Devolatilization Modeling on Flame Structure and Stabilization in Large Eddy Simulation of Pulverized Coal Combustion" by Marco Ghiani, Michele Vascellari, and Christian Hasse and "The influence of pyrolysis models and volatile matter composition on coal particle ignition" by Michele Vascellari and Christian Hasse.
New lecture course: Advanced Programming with Matlab
Starting with the spring semester 2012 the cair NTFD offers a lecture course devoted to the object-oriented progamming with Matlab. The course will held (in German language) by Uwe Prüfert.
Felix Dietzsch recieves DAGA student award
On the occasion of the awarding of student theses, Felix Dietzsch will be receiving the award for his diplom thesis "Numerical Investigations for Sound Propagation in Moving Flows" at the 38th German Annual Conference on Acoustics on March 20. He will give his talk about "Schallausbreitung in Strömungen - Ein Vergleich zwischen Galbrun-Gleichung und Potentialformulierung" on March 21.
Presentation at ICLASS conference
At the 12th International Conference on Liquid Atomization and Spray Systems (ICLASS) A. Bader, P. Keller, Prof. C. Hasse, and Prof. B. Meyer will publish there work on "The influence of non-ideal vapor-liquid-equilibria on the vaporization behavior of multicomponent hydrocarbon fuels". The paper is acceptet and will be presented at the conference on Sep. 2nd-6th 2012 in Heidelberg, Germany.
In the paper the differences between ideal and non-ideal vapor-liquid-equilibrium (VLE) and the effect on vaporization for multicomponent hydrocarbon fuels, which are representative for engines or gasifiers, are investigated. Based on these deviations, a parametric study of non-ideal VLE-behavior for a pressure range of 0.5-20.0 bar and a temperature range of 50-250 °C, which are typical evaporation conditions in IC engines and gasifiers, is performed. The VLE results are then applied for a 0D - single droplet evaporation model, which can be considered as a base model for most CFD applications. The droplet life time and the evaporation rates of the single components are compared between ideal and non-ideal behavior varying the pressure, the temperature and the particle Reynolds number. The observed differences suggest that non-ideal VLE have a significant impact on the droplet evaporation characteristics under engine conditions for complex hydrocarbon mixtures.
More Information about the conferenz can be found under http://iclass2012.org/.
NTFD organized Workshop on Chemnitz Linux Days
Steffen Weise and Danny Messig will give a workshop "OpenFOAM: Numerik mit freier Software am Beispiel" in the frame of the Chemnitz Linux Days. Driven by an experiment, where a bottle of beer plays an importand role, the way from the experiment to a running numerical simulation will be described.
For the simulation, the open source software OpenFOAM will be used. On the hands on workshop the participiants learn how to generate meshes, define boundary conditions, and how to interpret the results and visualize them with help of the programm Paraview. To learn more about the Chemnitz Linux Days visit the website website.
Christian Hasse member of the Scientific Committee of LES4ICE'12 conference
IFP Energies nouvelles organizes this conference on the challenges and applications of Large Eddy Simulation (LES) in internal combustion (IC) engines every two years since 2006. In 2012, the conference will take place on Nov. 29th/30th in Rueil-Mailmaison close to Paris at the IFP headquartes. Further information can be found at the following link link . Details of the 2010 conference are available here.
Seminar Talk by Prof. Norbert Peters
Prof. Norbert Peters form the Institute for Combustion Technology at TWTH Aachen will give a seminar talk on February 8th 2012 on "Turbulence Statistics along Gradient Trajectories" (seminar room 318, DBI building). Recent developments in the analysis of dissipation elements in turbulent flows are presented, which are based on high resolution direct numerical simulations (DNS) results. The detailed announcement can be downloaded here.
Visit Prof. Tommaso Lucchini
Professor Tommaso Lucchini from the Energy Department of the Politecnico di Milano visited the group of Numerical Thermo-Fluid Dynamics within the 24th till 25th of November. As part of the visit the collaboration of the two professorships was constituted in terms of exchanging PhD students, sharing data and scientific knowledge.
Prof. Stoyan gives course in Lisp and application to Emacs programming
Prof. Stoyan (formerly University Erlangen) will give a short course in Lisp programming for the researchers at the chair of Numerical Thermo-Fluid Dynamics and Energy process engineering on Nov 21st-23rd and Nov 28th-30th. In the first week, he will give an introduction to the concepts of Lisp, which includes e.g. functional programming, object oriented programming. In the second part, the focus will be on eLisp and specific Emacs related programming examples.
Uwe Prüfert will give talk on COMSOL Conference 2011 in Stuttgart
Uwe Prüfert will give on October 26th a talk "Mathematics-based Optimization in the COMSOL Multiphyscis Framework" on the COMSOL Conference 2011 in Stuttgart. The paper behind the talk is a result of the collobaration with Professor Thomas Slawig from the University of Kiel. The COMSOL Conference series provides a forum for scientists from ingenieering and science to present their models computed with the help of the multiphyiscs software COMSOL. Prof. Slawig and Dr. Prüfert present a paper where their analyse the applicability of equation based software to the optimal control of PDE. The main aspect in the paper was to verify some features provided by such kind of software as e.g. the solution of non differentiable equations by Newtons method.
Axel Zschutschke joins Chair of Numerical Thermo-Fluid Dynamics
Axel Zschutscke will join the Chair of Numerical Thermo-Fluid Dynamics in December 2011 as a researcher. He is currently writing his diploma thesis on the simulation of wetting behavior of liquid films using Lattice Boltzmann methods. During his PhD, Axel Zschutschke will work on the simulation of turbulent reactive flows.
Sandra Hartl joins Chair of Numerical Thermo-Fluid Dynamics
Sandra Hartl will join the Chair of Numerical Thermo-Fluid Dynamics in November 2011 as a researcher. She is currently a student of mathematics (major in numerical mathematics) at Technical University Chemnitz and she is currently writing her diploma thesis on the development of preconditioners for the simulation of MHD problems. During her PhD, Sandra Hartl will work on the development of flamelet models for URANS and Large Eddy Simulations (LES).
25th IFIP Conference 2011
On September 14, Uwe Prüfert will give a talk entitlet "Model Reduction in Chemical Engineering" on the 25th IFIP TC7 Conference on System Modelling and Optimization. The 25th IFIP TC7 Conference takes place from September, 12-16 in Berlin. Dr. Prüfert is invited to the minisymposia "Parameter Optimization and Model Improvement". The International Federation for Information Processing Technical Committee 7 - System Modeling and Optimization - arranges in a cycle of two years highly regarded conferences to several topics of Applied Optimization such as Optimal Control of Ordinary and Partial Differential Equations, Modeling and Simulation and Industrial Applications.
Researcher from Tshinghua University visits for 12 months
Zhiwei Yang from the Tsinghua University / Beijing will come for an extended research stay of 12 months to the chair of Energy Process Engineering and Numerical Thermo-Fluids Dynamics in Freiberg starting middle of October 2011. Zhiwei Yang has been working on simulation of particle flows using Euler-Euler methods. In Freiberg, he will focus on slag-flow modeling in gasifiers with special consideration of the multiphase thermodynamics. He will arrive in Freiberg middle of October.
Researcher from Cagliari University in Freiberg for 6 months
Marco Ghiani from the University of Cagliari in Italy will join the chair of Numerical Thermo-Fluid Dynamics in Freiberg for an extended research stay of 6 months starting middle of September 2011. Marco Ghiani works on the numerical simulation of coal gasification. In Freiberg, he will focus on Large Eddy Simulation of coal particle laden flows and flamelet-modeling.
Professor Thomas Slawig was guest of working group Numerical Thermo Fluid Dynamics
On July 21th, Professor Thomas Slawig was guest of the chair of working group Numerical Thermo Fluid Dynamics. Within the NTFD-Seminar he was giving a talk "Automatic differentiation in Simulation and Optimal Control". Professor Slawig is the Head of the Research Group "Algorithmic Optimal Control - Computational Marine Science" in the Cluster of Excellence "The Future Ocean" at the Department of Computer Science at Christian-Albrechts-Universität zu Kiel. In a fruitfull discussion the problem of applicability of AD for VIRTUHCON was discussed. A concrete collaboration the subproject "Model reduction by optimal Control" - which is the Master thesis of Philipp Mäser - was appointed. For the next future, a collaboration based on Bachelor/Master theses is planed.
Paper on Flamelet modeling of high pressure gasification accepted for Energy & Fuels
The paper: A flamelet based time scale analysis of a high pressure gasifier by P. Vegendla, D. Messig, S. Weise and C. Hasse was accepted for publication in Energy & Fuels (impact factor 2.4). This is the first published paper on gasifier modeling using a non-equilibrium flamelet-based approach and the results were compared to in-house experimental data. The HP-POX plant in Freiberg was simulated using natural gas as a feedstock. An OpenFOAM-flamelet coupling for a multi-feed system was developed. The validity of the flamelet approach was investigated in detailed usinig a time-scale analysis, which itself was derived from the flamelet equations. Except for hydrogen, the flamelet assumption was found to be applicable.
ERASMUS Bilateral Agreement with ELTE Budapest
An ERASMUS bilateral agreement between the Institute of Chemistry of the Eötvös Loránd Tudományegyetem(ELTE) Budapest and the IEC has been signed. Under- and post graduate students can now apply for a semester at the Institute of Chemistry at the ELTE. The Eötvös Loránd Tudományegyetem (engl. Loránd-Eötvös-University) Budapest was founded in 1635 and is the largest and oldest University in Hungary. About 32.000 Students will be schooled by 1.090 Professors and Lectures, included 58 ordinary members of the Hungarian Academy of Science. For further Information about ELTE visit www.elte.hu/en.
For detailed information about the study feel free to contact Professor Dr. Christian Hasse. Information about the application process you will find at the pages of the IUZ.
Visit Professor Slawig
On July 21th-22th 2011, Professor Thomas Slawig will visit the chair of NTFD. Professor Slawig is the head of the working group "Algorithmic Optimal Control - Computational Marine Science" at the Cluster of Excellence "The Future Ocean" at Christian-Albrechts University Kiel. One challenging problem when modeling geo-biochemical and oceanic models is the dimension of the parameter space as well as the size of the domain. Hence, model reduction is an important part of the modeling and the numerical treatment of such problems. It is not so surprising, that one can found interesting analogies to the reduction of reaction mechanisms what offers the potential for future collaboration.
On July, 21th. Professor Slawig will give a lecture titled "Automatic differentiation in Simulation and Optimal Control" within the NTFD-Seminar.
Diploma thesis defense Jens Keller
On June 23rd at 2:00 pm, Mr. Keller will defend his diploma thesis. In his thesis Mr. Keller worked on detailed diffusion flux modelling in laminar partially premixed flames. A new solver in OpenFOAM® was implemented and validated with experimental results. Furthermore there are studies on using Flamelet theory in laminar partially premixed flames. Mr. Keller studies mechanical engineering at the Technischen Universität Bergakademie Freiberg and was supervised by Prof. Hasse, Prof. Trimis and Mr. Messig.
Visit to Pennsylvania State University (USA) attending the 6th OpenFOAM Workshop
The OpenFOAM Workshop is an international conference on the open source equation solver system OpenFOAM which allows calculation in several fields of physics, fluid dynamics and especially the coupling of different fields of physics. New techniques using the software are presented to the participants in the workshop part of the conference. In the second part of the conference several scientific applications are presented and discussed. Over 250 participants exchange contacts and experiences on 4 days in several fields of application. Four members of the chair of numerical thermo fluid dynamics will give 4 out of 57 presentations in different sessions.
For more information check: www.openfoamworkshop.org
- Messig, D., Keller, J., Meyer, B., Hasse, C.: Modeling laminar partially premixed flames with complex diffusion in OpenFOAM®
- Uebel, K., Messig, D., Gschaider, B., Hasse, C,. Meyer, B.: Modeling high viscosity slag flows in entrained flow gasifiers using a Volume of Fluid (VOF) approach
- Vegendla, P., Weise, S., Messig, D., Hasse, C.: A CFD-FLAMELET model based time scale analysis of three-feed stream in a high pressure gasifier
- Keller, P., Hasse, C.: 2011 Simulation of Binary Droplet Evaporation using VOF Methods
Joint Virtuhcon paper accepted for Journal of applied mathematics
The paper Kestel, M., Nikrityuk, P.A., Hennig, O. and Hasse, C.: Numerical study of the partial oxidation of a coal particle row in steam and dry air atmospheres has been accepted for publication in the IMA Journal of applied mathematics. This work has been performed in collaboration between the Virtuhcon groups Interphase Phenomena (IPP) and the reactive flow systems (RFS).
The work focuses on the influence of the gas atmosphere on the gasification behavior of single and multiple coal particle showing a significant influence of steam.
Computing Ressources granted for DNS of partial oxidation flames
The Virtuhcon centre aims at understanding the physical processes under partial oxidation conditions (gasification). Direct numerical simulation of turbulence-chemistry interaction accounting for detailed transport mechanism is used to develop flamelet models for use in CFD simulation of gasification reactors. Direct numerical simulation requires significant High performance Computing (HPC) resources both in terms of CPU time and memory. The resources (650 000h CPU time) were granted on the SGI Altix at ZIH TU Dresden for the project dnsnppox. The research is performed in collaboration with the Lab. of Fluid Dynamics & Technical Flows (OvG University Magdeburg, Prof. Thévenin) and the DNS code parcomb3D is used.
CFD Summer School
In collaboration with the two departments of Fluid Dynamics and Thermodynamics, the chair of Numerical Thermo-Fluid Dynamics invites students to participate in a Computational Fluid Dynamics (CFD) summer school, which is especially targeted towards engineering students with a background in fluid mechanics and thermodynamics. Depending on previous experience, a crash course in basics of CFD and Linux is offered as prep course. Further information (in German) can be found in the flyer or here.
Extra NTFD Seminar
On May 26th, Dipl. Math. (FH) Philipp Mäser will give an introduction on his upcoming Master thesis and present first (theoretical) results. In his thesis Mr. Mäser works on the reduction of reaction mechanisms by using a method that comes from the Optimal Control of ODE/PDEs. The announcement can be downloaded . Mr. Mäser studies Scientific computing at the Technische Universität Berlin and is supervised by Professor Fredi Tröltzsch from TU Berlin and Uwe Prüfert, Phd. from VIRTUHCON.
Workshop on Laminar Burning Velocities
During the European Combustion Meeting in Cardiff (28.6.-1.7.2011) in Cardiff, a workshop on determining the laminar burning velocity with the Heat Flux Burner is being held. The heat flux burner and a combustion chamber for measuring burning velocities and high temperatures and pressures (up to 40 bar) are currently installed in Freiberg in a collaborative effort of the chair of Heat and Gas Technology (Prof. Trimis) and the chair of numerical Thermo-Fluid Dynamics. The goal is to measure accurate burning velocity data for syngas mixtures and biofuels for engines. This data is used both for CFD simulations as well as chemical kinetic mechanism development and reduction.
Short course on Turbulent Combustion
A short course on turbulent combustion is offered at the chair of numerical fluid dynamics. Eight lectures will cover modeling, experimental aspects of combustion modeling as well as spray combustion an d applicatons. The course starts Tuesday, 10th May 2011, 8 am in the Seminarraum, Haus 1, Reiche Zeche. The full course agenda can be downloaded here.
Christian Hasse visits University of Lund, Sweden
Christian Hasse will visit Lund University on 11th and 12th of May. He will give a presentation on the experimental and numerical results of the FG-flame (inverse diffusion flame under partial oxidation conditions). On May 12th he is the faculty opponent for the Phd defense of Tobias Joelsson, the title of the thesis is Large Eddy Simulation of Turbulent Reactive Flows under HCCI Engine Conditions.
Visit Prof. Turanyi, Co-operation with ELTE appointed
Prof. Turanyi from the Eötvös University Budapest (ELTE) was from 29th - 30th of March a guest of the chair of NTFD.
During his stay, Prof. Turanyi visited the Institute of Energy Process Engineering and Chemical Engineering, the Institute of Heat Technology and Thermodynamics and the Institute of Mechanics and Fluid Dynamics.
On the second day, Professor Turanyi was giving a Lecture "Optimization of combustion mechanisms". In a fruitful discussion several points of interest have been discussed. A intensive collaboration between the department of chemistry of ELTE and NTFD/Virtuhcon in the fields of combustion modeling, mechanisms development/mechanisms reduction, and combustion experiments has been arranged.
Further, the constitution of an ERASMUS program for the exchange of students was appointed.
Visit Prof. Turanyi on March 29th-30th 2011
Prof. Turanyi, Professor of Chemistry at the Institute of Chemistry, Eötvös Universität (ELTE) Budapest, and a leading expert in the field of for Chemical Kinetics, will visit the chair of Numerical Thermo-Fluid Dynamics and the Virtuhcon centre. On March 30th, Prof. Turanyi will give a lecture titled "Optimization of combustion mechanisms".
Details can be found on the announcement.
Beside a laboratory tour of the facilities in Freiberg, Prof. Turanyi will visit the Institute of Thermal Engineering. Based on Prof. Turanyis research interests, future collaborations in the field of model reduction in combustion chemistry will be discussed.
Two upcoming presentations at the Conference on Engine combustion processes in Munich
Current research results on engine combustion will be presented at the International Conference in Munich.
" Simulation der Stickoxidemissionen von direkteinspritzenden Ottomotoren mit einem gekoppelten CFD-Multizonen Modell", D. Linse, A. Kleemann, B. Durst, C. Hasse
"Thermodynamic modeling for new BMW Group spark ignition engines – A contribution to physical real time combustion prediction", S. Grasreiner, D. Linse, C. Hasse
The 10th conference on engine combustion processes will take place from 24.-25.3 in Munich, Germany (www.hdt-essen.de)
Invited presentation at Von Karman Institute
Prof. Hasse was invited to give a presentation about the current state-of-the-art in gasification modeling at the renowned Von Karman institute (www.vki.ac.be). Due to timing conflicts, Dr. Stefan Murza agreed to give the lecture "Modeling of gasification processes" on March 24th.
Prof. Bockhorn will give invited lecture at the 1st Ercoftac conference on Multiphase Flows in Gasification and Combustion
Prof. Bockhorn from KIT will give an invited lecture at the 1st Ercoftac conference on Multiphase Flows in Gasification and Combustion. The topic of his talk is "Simulation of Soot in Combustion Systems: Black Magic or Knowledge-based Modeling". Details on the invited lectures of the conference can be found on www.virtuhcon-conference.de.
Dr. Henning Bockhorn is Professor of Chemical Engineering and Professor of Combustion Technology. He is director of the Section of Combustion Technology at the Engler-Bunte-Institute at the Karlsruhe Institute of Technology (KIT). He is also chairman of the collaborative Research Center (Sonderforschungsbereich) 606: Instationary combustion - Transportation Phenomena, Chemical Reaction, Technical Systems.
Visit Prof. Thévenin on March 3rd 2011
Prof. Thévenin, co-organizer of the 1st Ercoftac conference on Multiphase Flows in Gasification and Combustion (www.virtuhcon-conference.de), and two of his research team members visited the chair of Numerical Thermo-Fluid Dynamics and the Virtuhcon centre. Based on the common research interests, the ongoing experimental and numerical research activities on inverted rich diffusion flames (FG flame) were discussed. It was agreed to start collaboration on simulating the physical and chemical processes in the reforming zone of the FG flame using direct numerical simulation (DNS).
Prof. Thévenin gave a seminar on "Direct Numerical Simulation of highly turbulent flames" showing recent results. He highlighted the possible use of DNS for advanced model development as well as High Performance Computing (HPC) aspects.
Prof. Thévenin holds the chair of Fluid Dynamics & Technical Flows at the Institute of Fluid Dynamics & Thermodynamics at Otto-von-Guericke Universität Magdeburg (www.uni-magdeburg.de). He is an expert in modeling of turbulent combustion using direct numerical simulation (DNS)
Visit Prof. Kronenburg on March 2nd 2011
Prof. Kronenburg and Dr. Oliver Stein from the University of Stuttgart visited the chair of Numerical Thermo-Fluid Dynamics and the Virtuhcon centre. After an extended laboratory tour of the facilities in Freiberg, possible future collaborations were discussed. Prof. Kronenburg gave a seminar on “Combustion LES of turbulent lifted flames”. He illustrated the use of conditional moment closure (CMC) especially focusing on the different stabilization mechanisms of lifted flames.
Prof. Kronenburg holds the chair of Technical Combustion at the University of Stuttgart (www.itv.uni-stuttgart.de). He is an expert in modeling of turbulent combustion using conditional moment closure (CMC).
Two Presentations accepted for 13th International Conference on Numerical combustion
The two submissions for the conference on numerical combustion were accepted
"Flame structure and flamelet analysis of an inverse diffusion flame", K. Uebel, B. Stelzner and C. Hasse
"Numerical Simulation of Binary Mixture Droplet Evaporation and Breakup for Different Weber Numbers", P. Keller and C. Hasse
The conference will take place in Corfu, Greece April 27th-29th (www.icnc2011.ntua.gr)
Dr. Vascellari joins the Chair of Numerical Thermo-Fluid Dynamics as senior researcher
Dr. Michele Vascellari joined the Chair of Numerical Thermo-Fluid Dynamics and the Virtuhcon centre beginning of March 2011. Dr. Vascellari will work on the modeling of coal gasification developing advanced flamelet based models. Dr. Vascellari is an expert in modeling of coal combustion and gasification. He obtained his PhD degree from the University of Cagliari (www.unita.it) in 2003, his thesis was entitled "Zero emission hydrogen/oxygen combustion steam turbine power plants integrated with coal gasification and carbon dioxide removal". After obtaining his PhD degree he worked on several research projects on pulverized coal gasification and combustion, fixed bed gasification.
Prof. Gupta will give invited lecture at the 1st Ercoftac conference on Multiphase Flows in Gasification and Combustion
Prof. Ashwani Gupta from the University of Maryland will give an invited lecture at the 1st Ercoftac conference on Multiphase Flows in Gasification and Combustion. The topic of his talk is "Benchmark experiments for gasification modeling" Details on the invited lectures of the conference can be found on www.virtuhcon-conference.de.
Professor Ashwani K. Gupta has been a faculty member in the Mechanical Engineering Department at the University of Maryland, College Park since 1983, following six years at MIT as a member of the research staff in the Energy Laboratory and Department of Chemical Engineering, and three years at Sheffield University as an independent research worker and research fellow in the Department of Chemical Engineering and Fuel Technology.
Franziska Hunger starts as PhD student at the Chair of Numerical Thermo-Fluid Dynamics
Franziska Hunger joined the Chair of Numerical Thermo-Fluid Dynamics and the Virtuhcon centre beginning of 15th February 2011. In her PhD research Franziska Hunger will work on developing flamelet models for inverted rich diffusion flames (FG-flame). This laboratory flame, which is developed jointly with the chair of heat and gas technology, is a reference setup for studying the physical processes in gasification reactors featuring both a combustion zone near the nozzle and a reforming zone.
Franziska Hunger studied chemical engineering at TU Freiberg majoring in simulation and obtained in Diploma degree in January 2011. In her diploma thesis she investigated numerically and experimentally the NOx formation in burners and possible strategies for emission reduction by exhaust recirculation.
Contribution accepted GAMM Meeting in Graz
The contribution for the 82nd Annual Meeting of International Association of applied mathematics and mechanics (GAMM) was accepted
"Investigation of inverse diffusion flames in the partial oxidation regime for gasification processes", B. Stelzner, S. Voss, K. Uebel, A. Laugwitz, B. Meyer, D. Trimis, C. Hasse
The conference will take place in Graz/Austria from April 18th-21st (www.gamm2011.tugraz.at)
Prof. Reveillon will give invited lecture at the 1st Ercoftac conference on Multiphase Flows in Gasification and Combustion
Prof. Julien Reveillon from the University of Rouen will give an invited lecture at the 1st Ercoftac conference on Multiphase Flows in Gasification and Combustion. The topic of his talk is "Towards fully coupled modeling of liquid atomization and dispersed spray combustion". Details on the invited lectures of the conference can be found on www.virtuhcon-conference.de.
Julien Reveillon is Professor at the Department of Physics of the University of Rouen and he conducts research at CORIA laboratory, a CNRS facility dedicated to energy research and related topics.Julien's main areas of study are two-phase flows and combustion phenomena. He carries out direct numerical simulation (DNS) analysis of liquid atomization, dispersion and evaporation that leads to mixture ignition and flame propagation.
Felix Dietzsch starts as PhD student at the Chair of Numerical Thermo-Fluid Dynamics
Felix Dietzsch joined the Chair of Numerical Thermo-Fluid Dynamics and the Virtuhcon centre beginning of 1st February 2011. In his PhD research Felix Dietzsch will use direct numerical simulation (DNS) to study turbulent inverted rich diffusion flames (FG-flame). This laboratory flame, which is developed jointly with the chair of heat and gas technology, is a reference setup for studying the physical processes in gasification reactors featuring both a combustion zone near the nozzle and a reforming zone. The DNS will focus on the processes in the reforming zone and the results will be used to develop suitable flamelet/multi-scale models, which are used in the simulation of laminar and turbulent gasification flames.
Felix Dietzsch studied mechanical engineering at TU Dresde and obtained in Diploma degree in January 2011. The research for his diploma thesis "Numerical Investigations for Sound Propagation in Moving Flows" was partially conducted in Chile.
Dr. Pepiot will give invited lecture at the 1st Ercoftac conference on Multiphase Flows in Gasification and Combustion
Dr. Perine Pepiot from the National Renewable Energy Laboratory will give an invited lecture at the 1st Ercoftac conference on Multiphase Flows in Gasification and Combustion. The topic of her talk is "Biomass gasification for biofuel synthesis: a modeling approach to the tar problem". Details on the invited lectures of the conference can be found on www.virtuhcon-conference.de
Dr. Pepiot is currently an research scientist in the National Bioenergy Center at the National Renewable Energy Laboratory in Golden, Colorado, USA. She received a Master of Science in Aeronautics and Astronautics from ENSAE (Supaero) in Toulouse, France, and a Master of Science in Mechanical Engineering from Stanford University in 2004. She graduated from Stanford University in June 2008 with a Ph.D. in Mechanical Engineering.
Prof. Hasse on European Exascale Software Initiative Expert Panel
Prof. Hasse attends the 1st meeting of the meeting of the working group "Industrial and Engineering Applications" of the European Exascale Software Initative (EESI) in Paris to discuss the applications for the next generation of Exaflop computers. This expert panel consists of 15 members both from industry and academia. Started in June 2010 and funded by the European Commission, the goal of EESI is to build a European vision and roadmap to address the challenge of performing scientific computing on the next generation of computers composed of millions of heterogeneous cores, which will provide multi Petaflop performance in 2010, and Exaflop performance in 2020. These hardware capabilities will lead to outstanding technological breakthrough opportunities in computations and simulations.
Two contributions accepted for 5th European Combustion Meeting
Two abstracts were accepted for the upcoming 5th European Combustion Meeting.
"Reduction of a detailed kinetic model for the ignition of gasoline surrogate mixtures using simulation error minimization methods", Tibor Nagy, U. Prüfert, C. Hasse, H. J. Curran, T. Turányi.
"Preliminary investigation of inverse diffusion flames in the partial oxidation regime", B. Stelzner, S. Voss, K. Uebel, A. Laugwitz, F. Hunger, B. Meyer, D. Trimis, C. Hasse
The Fifth European Combustion Meeting is to be held in Cardiff University from 28th June - 1st July 2011 (www.ecm2011.org)