Octree-generated virtual mesh for improved contact resolution in CFD-Dem coupling

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388998%3A_____%2F22%3A00560841" target="_blank" >RIV/61388998:_____/22:00560841 - isvavai.cz</a>

Result on the web

<a href="http://www2.it.cas.cz/fm2015/im/admin/showfile/data/my/Papers/2022/21-TPFM2022.pdf" target="_blank" >http://www2.it.cas.cz/fm2015/im/admin/showfile/data/my/Papers/2022/21-TPFM2022.pdf</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.14311/TPFM.2022.021" target="_blank" >10.14311/TPFM.2022.021</a>

Result language

angličtina

Original language name

Octree-generated virtual mesh for improved contact resolution in CFD-Dem coupling

Original language description

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.

Czech name

—

Czech description

—

Type

D - Article in proceedings

CEP classification

—

OECD FORD branch

20302 - Applied mechanics

Project

<a href="/en/project/EF15_003%2F0000493" target="_blank" >EF15_003/0000493: Centre of Excellence for Nonlinear Dynamic Behaviour of Advanced Materials in Engineering</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2022

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

Topical Problems of Fluid Mechanics 2022

ISBN

978-80-87012-77-2

ISSN

2336-5781

e-ISSN

—

Number of pages

8

Pages from-to

151-158

Publisher name

Ústav termomechaniky AV ČR, v. v. i.

Place of publication

Praha

Event location

Praha

Event date

Feb 16, 2022

Type of event by nationality

EUR - Evropská akce

UT code for WoS article

001235659500021