SA Turbulence Model and drag prediction
Dear All,
Just needed everyone's opinion on the use of the SA turbulence model for drag prediction of airfoils. I have used the SA model for predicting Lift Coef.. at different angles of attack and the results are very close to the wind tunnel results, however I havent had luck with the Drag Coef.. values? Which turbulence model would predict Drag as nicely as the SA does lift? Many thanks in advance. Alan 
Dear Alan ,
as compared to Cl , Cd are more sensitive to grid refinements . Also , SA is not very accurate (compared to kw SST ) in resolving the flow separations, that may be occurring at high AOA. You can refine the mesh using Prism elements at boundary layer and use a combination of RANS models with first order and second upwind schemes to save computational resources. Hope that Helps ! 
The threads you are replying to are very old. For instance this one is 11 years old. :D

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