Patrick G. Hu

August 6, 2002 09:34 
Corner Vortex for Backward Facing Step
Recently I performed the numerical calculation for backward facing step using komega model of Wilcox's low Reynolds number version in 1998 (This case is standard case for validating the code, and has a experimental data for comparison. See the Journal paper: AIAA Journal Vol.23, No.2, David M. Driver and H. Lee Seegmiller, "Features of Reattaching Turbulent Shear Layer in Divergent Channel Flow"). I used 121x121 grid points and the domain is 45x9 (using the height of the step as the length scale). I do captured the corner eddy which is confined within about 1 dimension of the step hight. But some papers claimed that calculation did not capture this corner eddy before. I would like to know if recently anybody captured this corner eddy too if using Turbulence Modeling like ke and komega model. Why calculation is difficult to capture this corner eddy. In the experiment, Driver at al. saw the existance of this coner eddy confined within 2 times of the step hight. I very appreciate if anybody can share your idea with me.
