[nskelly]

Hi,

I am performing some LES of BFS flow and I am computing the primary recirculation zone length located behind the step.

I am comparing my data with experimental data of Armaly, with difficulty. According to Armaly at Re=2000, the RZL (x/S - length of zone divided by step height) should be roughly 13.5, whereas I am getting quite large value of 20. For greater Re this also increases (linearly) whereas shows decrease.

Would anyone know why this would happen? Would wall boundary conditions be the problem? I am using Smagorinsky SGS models, with a mesh of y+ < 1, and no wall functions.

Any help would be appreciated