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Fluid-particle systems are very common in many natural processes andengineering applications. However, accurately and efficiently modellingfluid-particle systems with complex particle shapes is still a challengingtask. Here, we present a numerical model that combines the advantages ofLattice Boltzmann Method (LBM) in solving complex flow problems and thecapability of the recently introduced Metaball Discrete Element Method (MDEM)in handling non-spherical particle shapes. A sharp interface coupling scheme isdeveloped and the numerical instability issues due to the discontinuity ofinterfaces are carefully addressed. A local refilling algorithm for new fluidnodes is proposed and special treatments are introduced to reduce numericalnoises when two particles are close. The proposed model is validated bysimulations of settling of a single sphere (with metaball representation) aswell as a non-spherical particle in a viscous fluid. Good agreements are foundcomparing the simulations with experimental results which are also carried outin this study. The coupling scheme is also tested by multiple particlesimulations which clearly illustrated the stability of the proposed model.Finally, numerical examples with complex particle shapes demonstrated that theproposed model can be a powerful tool for future applications such asshape-induced segregation in riverbeds, and phase transition of densesuspension.

journal of computational physics

Coupled Metaball Discrete Element Lattice Boltzmann Method for  Fluid-Particle Systems with non-spherical particle shapes: A sharp interface  coupling scheme