0566514 - ÚT 2023 eng C - Conference Paper (international conference)
Studeník, O. - Kotouč Šourek, M. - Isoz, Martin - Kočí, P.
Improvements in contact resolution of arbitrarily shaped bodies in CFD-DEM solver.
[International Conference of SSCHE & Membrane Conference PERMEA 2022 /48./. Tatranské Matliare (SK), 15.05.2022-18.05.2022]
R&D Projects: GA MŠMT(CZ) EF15_003/0000493
Institutional support: RVO:61388998
OECD category: Applied mathematics

The automotive industry faces increasing demand for pollution reduction. Present methods and technologies developed for exhaust gas after treatment must be optimised and improved to meet rising demands. Such optimisation can be accomplished with a mathematical model describing the washcoating deposition of active catalytic material into a structure of catalytic filter. This process is currently described only with empirical models. The irregular solid particles of catalyst are dispersed in fluid in the form of slurry during washcoating. The fluid and solid phases are mutually affected by the solid particles coming into contact with each other and with the substrate. Such conditions require a detailed description of particles and fluid. This can be achieved with the coupling of CFD and DEM methods. However, the vast majority of currently available CFD-DEM solvers replace solid particles with spheres. Nevertheless, the real particles often cannot be simplified to spheres, and the irregularity of their shape must be considered. In this work, we present the extension to the custom-developed CFD-DEM solver designed to ensure accurate solution of particle collisions without a significant burden on computation time, the so-called virtual mesh. The principle of the proposed virtual mesh is to increase the resolution of particle collisions without any modifications to the computational mesh. The results of this approach are presented in a pilot study comparing the trajectory of particles and normal contact force for a plastic collision between two spheres. The test was carried out for the standard sphere DEM, dynamic mesh refinement and virtual mesh.
Permanent Link: https://hdl.handle.net/11104/0338253