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Coupled three‐dimensional discrete element‐lattice Boltzmann methods for fluid‐solid interaction with polyhedral particles
Author(s) -
Gardner Michael,
Sitar Nicholas
Publication year - 2019
Publication title -
international journal for numerical and analytical methods in geomechanics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.419
H-Index - 91
eISSN - 1096-9853
pISSN - 0363-9061
DOI - 10.1002/nag.2972
Subject(s) - lattice boltzmann methods , discrete element method , fluid–structure interaction , particle (ecology) , simplex , aerodynamics , finite element method , cfd dem , mechanics , fluid dynamics , physics , mathematics , geometry , engineering , geology , structural engineering , oceanography
Summary Interaction between solid particles and fluid is of fundamental interest to scientists and engineers in many different applications—cardiopulmonary flows, aircraft and automobile aerodynamics, and wind loading on buildings to name a few. In geomechanics, particle shape significantly affects both particle‐particle and particle‐fluid interaction. Herein, we present a generalized method for modeling the interaction of arbitrarily shaped polyhedral particles and particle assemblages with fluid using a coupled discrete element method (DEM) and lattice Boltzmann method (LBM) formulation. The coupling between DEM and LBM is achieved through a new algorithm based on a volume‐fraction approach to consider three‐dimensional convex polyhedral particles moving through fluid. The algorithm establishes the interaction using linear programming and simplex integration and is validated against experimental data. This approach to modeling the interaction between complex polyhedral particles and fluid is shown to be accurate for directly simulating hydrodynamic forces on the particles.