S-A Turbulence Model and drag prediction

November 15, 2005, 18:48

Dear All,

Just needed everyone's opinion on the use of the S-A turbulence model for drag prediction of airfoils.

I have used the S-A 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 S-A does lift?

Many thanks in advance.

Alan

fuzzylogic · January 11, 2016, 07:47

Dear Alan ,

as compared to Cl , Cd are more sensitive to grid refinements .
Also , S-A is not very accurate (compared to k-w 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 !

shereez234 · January 11, 2016, 09:33

The threads you are replying to are very old. For instance this one is 11 years old.

November 15, 2005, 18:48	S-A Turbulence Model and drag prediction	#1
Alan Guest Posts: n/a	Dear All, Just needed everyone's opinion on the use of the S-A turbulence model for drag prediction of airfoils. I have used the S-A 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 S-A does lift? Many thanks in advance. Alan

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January 11, 2016, 07:47		#2
fuzzylogic New Member sandy Join Date: Oct 2014 Posts: 4 Rep Power: 12	Dear Alan , as compared to Cl , Cd are more sensitive to grid refinements . Also , S-A is not very accurate (compared to k-w 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 !

January 11, 2016, 09:33		#3
shereez234 Senior Member M Sereez Join Date: Jan 2014 Location: England Posts: 353 Blog Entries: 1 Rep Power: 13	The threads you are replying to are very old. For instance this one is 11 years old.