Hydrodynamic Theory of wet Particle Systems
|Gefördert durch:||Deutsche Forschungsgemeinschaft (Projekt SCHW 1168/6-1)|
Many natural phenomena and technical operations involve flows with wet granular materials, for example landslides or wet agglomeration. Detailed investigations of these processes can be performed with suitable numerical models. There are mainly two possible modeling approaches: discrete element method (DEM) simulations based on Lagrangian tracking of individual granular particles or computational fluid dynamics (CFD) simulations based on an Eulerian fluid dynamics (continuum) approach.
The objective of the actual research project is to develop a hydrodynamic description of the flow of wet granular materials, which is based on detailed knowledge of the links between micro-scale and macro-scale material parameters. The main targets of the project are (i) the formulation of suitable constitutive equations for the stress-strain relations, especially for wet granular materials, (ii) the deduction of the parameters in the constitutive equations from discrete element simulations, (iii) the validation of the micro-macro transition with data from suitable experiments with wet granular materials and (iv) the development of new, more efficient macroscopic simulation tools to model realistic, large-scale experiments. As the main working hypothesis, it is assumed that the constitutive stress-strain relations can be described by generalized fluid dynamics-like models, where the parameters of the constitutive model depend on local flow parameters, like e.g. density, pressure, shear rate or volume fractions of the wetting liquid and of the particulate solid phase, respectively.