Low Reynolds number backward-facing step flow calculation and adaptive mesh application

Abstract

In this paper, a study of the flow behavior in a backward facing step in low Reynolds number range from 100 to 800 is conducted using COMSOL Multiphysics^®. The k-ε turbulence model is takne into account. The investigation starts from a standard mesh and then refine the standard mesh using an adaptive mesh refinement method. The horizontal and vertical velocity component profiles, pressures and the velocity quiver are shown on the refined meshes. The overall characteristics of separating shear layer, the flow behavior of the transverse vortices in the main flow and a reattachment length on a lower side wall is presented. The effectiveness of the adaptive mesh refinement method is verified and the method could be expected as a CAE analysis tool for industrial utilization.