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A pressure boundary integral method for direct fluid–particle simulations on Cartesian grids

✍ Scribed by Julian A. Simeonov; Joseph Calantoni

Publisher
Elsevier Science
Year
2011
Tongue
English
Weight
814 KB
Volume
230
Category
Article
ISSN
0021-9991

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✦ Synopsis

We consider a new Cartesian grid method for direct numerical simulations of fully coupled interaction of incompressible flow and spherical particles, based on a discontinuous extension of the pressure Poisson equation (PPE) across particle boundaries. We give a complete mathematical description of the boundary-integral treatment of the discontinuous PPE that includes the derivation of a new pressure boundary condition for accelerating boundaries and the solution of the system of boundary integral equations using spherical harmonics expansions. The model was validated with the standard test for finite Reynolds number flow around a sphere and with a novel test using the analytical solution for the Stokes flow past two adjacent spheres moving with the same velocity. The model capability and numerical efficiency was demonstrated with simulations for the collective settling of groups of 64-512 particles.

Published by Elsevier Inc.

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