An adaptive timestepping algorithm for particle time integration in coupled CFD-DEM simulations.

Abstract

An adpative integration technique for time advancement of particle motion in the context of coupled computational fluid dynamics (CFD) -discrete element method (DEM) simulations is presented in this work. CFD-DEM models provide an accurate description of multiphase physical systems where a granular phase exists in an underlying continuous medium. The time integration of the granular phase in these simulations present unique computational challenges due to large variations in time scales associated with particle collisions. The algorithm presented in this work uses a local time stepping approach to resolve collisional time scales for only a subset of particles that are in close proximity to potential collision partners, thereby resulting in substantial reduction of computational cost. This approach is observed to be 2-3X faster than traditional explicit methods for problems that involve both dense and dilute regions, while maintaining the same level of accuracy.

Fluid-elastic structure interaction simulation by using ordinary state-based peridynamics and peridynamic differential operator

“…damage in Multiphysics problems [45] 1) a nonlocal extension of continuum mechanics formulation [15] 2) easy to implement for damage prediction capability [15] Limited literature on fluid flow [34] SPH Explicit [46] or Implicit (ISPH) [47] Fluid flow [46] Simple formulation [46] Heavily dependent on choice of kernel function [48] DEM Explicit [49] Fracture in Solids [49],…”