Off-center peaks in an impinging jet

John

Hi,

I am trying to simulate 2D slot and 3D square impinging jets(free and confined) with FLUENT. At low nozzle-to-plate spacings and at high Re(say H/W<2, Re_W>10000), experimental data shows an off-center peak in the skin-friction factor and Nu profiles. I tried all the k-eps and RSTM cases (steady) with the standard and enhanced wall functions, but cannot capture those secondary peaks. The nozzle exit BC's are 1-10% turbulent intensity and a turbulence length scale of 0.07W. I also tried the case with fully developed turbulent flow between two parallel plates in the case of slot jets(using k and eps profiles obtained from the flow between parallel plates at the nozzle exit) as the nozzle-exit condition but didn't work either. Any suggestions? Will unsteady simulations help?

Thank you in advance.

John

p.s. Is there anybody running LES using Smagorinsky model and getting good agreement?