Computation of Turbulent Shear Flow over Surface‐Mounted Obstacle

Abstract

A numerical prediction of turbulent shear flow over a two‐ and three‐dimensional obstacle is obtained by solving weakly compressible flow equations, along with Smagorinsky's subgrid‐scale turbulent model. The numerical scheme is based on MacCormack's predictor‐corrector explicit finite volume method. First, computations were made for the case of flow over a two‐dimensional obstacle having different input boundary‐layer thickness, then for a cubical bluff body in one fourth‐power boundary layer. The computed results are in good agreement with the available experimental data. The effect of input boundary layer on the flow field in the two‐dimensional case was analyzed. The time‐averaged pressure around the cubical bluff body, wake pattern behind the body, horseshoe vortex, and a pair of axial vortices in the far wake region were well predicted.