2020/05/24 by Zhouyang Ge, Ge, Zhouyang, Luca Brandt +1 · 2 citations
Engineering · Physics and Astronomy · #Fluid Dynamics Simulations and Interactions #Granular flow and fluidized beds #Lattice Boltzmann Simulation Studies #cond-mat.soft #physics.flu-dyn
paper · pdf · doi:10.48550/arxiv.2005.12755
arxiv created 2020/05/24 · arxiv updated 2020/05/27
We describe and summarize a class of minimal numerical models emerged from recent development of simulation methods for dense particle suspensions in overdamped linear flows. The main ingredients include (i) a frame-invariant, short-range lubrication model for spherical particles, and (ii) a soft-core, stick/slide frictional contact model activated when particles overlap. We implement a version of the model using a modified velocity-Verlet algorithm that explicitly solves the N-body dynamical system in O(cN) operations, where c is a kernel constant depending on the cutoff of particle interactions. The implementation is validated against literature results on jamming transition and shear thickening suspensions from 40% to 64% volume fractions. Potential strategies to extend the present methodology to non-spherical particles are also suggested for very concentrated suspensions.