Sedimentation of general shaped particles using a multigrid fictitious boundary method

Nazia Talat, Saqia Jabeen, Kamran Usman, Moubin Liu*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

7 Citations (Scopus)


In this paper, a direct numerical simulation technique, the Finite Element Fictitious Boundary Method (FBM), is used to simulate fluid-solid two-phase flows of different general shaped particles. The momentum interactions between solid and fluid phases are handled by using the FBM. The continuity and momentum equations are solved on a fixed Eulerian grid that is independent of flow features by using a discrete projection scheme inside a multi-grid finite element approach. A detailed description is presented for the geometric representation and modeling of two-dimensional particles of different general shapes, i.e., circular, elliptical, square, rectangular, triangular, and pentagonal shapes inside the fluid. We discussed the effects of particle shapes and the influences on the settling behavior of the particles. A comparison of the settling trajectories of the particles of the same mass but with different shapes is presented. Moreover, depending upon the particle's shape, some interesting facts are discovered, which have a great influence on the particles' trajectory and settling velocity. Some very important correlations between the drag force coefficient and particle's Reynolds numbers with different density ratios of particles are obtained. Furthermore, we also studied the settling behavior of elliptical and rectangular particles with different axis ratios and a boomerang particle with different concave angles.

Original languageEnglish
Article number063301
JournalPhysics of fluids
Issue number6
Early online date1 Jun 2020
Publication statusPublished - 2020
Externally publishedYes


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