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set Critical Reynolds number - RANS k-w-SST

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Old   June 27, 2018, 10:15
Question set Critical Reynolds number - RANS k-w-SST
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Hey everybody,

Still quite new to openfoam and was doing some simulations to see how openfoam compares with reality.
I ran 3 different cases to check how simplefoam handles a flat plate and found that for the high Re form of the k-w-sst both cases (1 w/o surface rougness and 1 with surface roughness) show transition occurring at Re_x ~ 5.0e5 (see attached images), which makes sense for a flat plate without roughness, but not necessarily for other cases.

My question is, is there a way to change the critical Re_x criterion such that transition occurs at lower Reynolds numbers?
I'll be moving to airfoils with surface roughness soon and would like it to transition somewhere between 1.0e5-3.0e5.

Thanks in advance!

Attached Images
File Type: png Cf-Re_theta.png (65.8 KB, 11 views)
File Type: png Cf-Re_x.png (58.7 KB, 5 views)
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critical, flat plate, reynolds number, transition airfoil, transition boundary layer

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