Název: Octree-generated virtual mesh for improved contact resolution in CFD-Dem coupling
Autoři: Studeník, O. ; Kotouč Šourek, M. ; Isoz, Martin
Typ dokumentu: Příspěvky z konference
Konference/Akce: Topical problems of fluid mechanics 2022, Praha (CZ), 20220216
Rok: 2022
Jazyk: eng
Abstrakt: The present work is focused on improving the efficiency of a computational fluid dynamics (CFD) – discrete element method (DEM) solver allowing for computations with non-spherical solids. In general, the combination of CFD and DEM allows for simulations of freely moving solid particles within a computational domain containing fluid. The standard approach of CFD-DEM solvers is to approximate solid bodies by spheres, the geometry of which can be fully defined via its radius and center position. Consequently, the standard DEM contact models are based on an overlap depth between particles, which can be easily evaluated for a sphere-sphere contact. However, for a contact between two non-spherical particles, the overlap depth cannot be used and has to be replaced by the more general overlap volume. The precision of the overlap volume computation is (i) crucial for the correct evaluation of contact forces, and (ii) directly dependent on the computational mesh resolution. Still, the contact volume evaluation in DEM for arbitrarily shaped bodies is usually by at least one order of magnitude more demanding on the mesh resolution than the CFD. In order to improve the computational efficiency of our CFD-DEM solver, we introduce the concept of an OCTREEbased virtual mesh, in which the DEM spatial discretization is adaptively refined while the CFD mesh remains unchanged.
Klíčová slova: CFD; DEM; HFDIB-DEM; OpenFOAM; washcoating
Číslo projektu: EF15_003/0000493
Poskytovatel projektu: GA MŠk
Zdrojový dokument: Topical Problems of Fluid Mechanics 2022, ISBN 978-80-87012-77-2, ISSN 2336-5781

Instituce: Ústav termomechaniky AV ČR (web)
Informace o dostupnosti dokumentu: Dokument je dostupný na externích webových stránkách.
Externí umístění souboru: http://www2.it.cas.cz/fm2015/im/admin/showfile/data/my/Papers/2022/21-TPFM2022.pdf
Původní záznam: https://hdl.handle.net/11104/0334776

Trvalý odkaz NUŠL: http://www.nusl.cz/ntk/nusl-510654


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Věda a výzkum > AV ČR > Ústav termomechaniky
Konferenční materiály > Příspěvky z konference