Grad's approximation for moving and stationary walls in entropic lattice Boltzmann simulations

摘要: We introduce a new generalized wall boundary condition for the entropic lattice Boltzmann method (ELBM) that is capable of handling complex flow geometries including moving walls. The Grad's ten moments approximation employed to approximate missing populations at nodes. significantly improves accuracy, stability and sub-grid features LBM in particular its variant, ELBM. proposed tested range flows two dimensions, planar channel flow, Couette past circular cylinder sedimenting particles. Further simulations involving such as flapping wing transversely oscillating demonstrate superior accuracy condition.