Hi all,

I'm doing an analysis on the effect of surface roughness on transition from laminar to turbulent flow past a spheroid body. When I run the same simulation with or without roughness hight of 1000,400,100,50 micron it seems I don't get any change of the results (pressure distribution, shearing stress etc).

further more the cells near the solid walls were higher than the roughness hight as requested in fluent user guide (Cs=0.5). I use a standard k-omega model for transitional flows.

Thanks in advance john

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Laminar flow you have no influence of roughness

y=64/RE is remember

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