Poor Results with RSM in Fluent
 

I am trying to compute the skin friction coefficent on an isothermal plate for validation purposes. Using the k-w SST I get very accuate results. Using the RSM, not even close. The flow is at Ma = 0.5. The air is at 1000 K and the plate is at 200 K. The mesh has a y+ of 0.1.

Any suggestions?

Thank you very much for your time and help.