Grid sensitivity

Riki · August 12, 2013, 06:45

Hey. I am simulating 2d airfoil (very low reynolds number, laminar, incompressible, transient flow). I am comparing my results (CL) to some published work. I want to know about grid sensitivity rule.
I mean for every angle of attack first I have to use unrefined mesh and get converged result and then check different refine meshes to make it grid independent or just at initial few angle of attacks i should find the best refine mesh and will use it throughout?
Also, I have to refine the mesh in my meshing software (ICEM CFD in my case) or just refining in Fluent is enough (with "Adapt" option)?
My english is not very well, sorry for that.. Please clear my idea about this.. I will appreciate if someone correct me if i am wrong or add more about this.
thanks in advance

Barzanoni · August 17, 2013, 08:20

hi Riki

i had a similar problem as yours,
at first,
at first, i refined my mesh with ansys for first and second angel of attack, and check mesh dependency and found that with two step mesh adapt on the boundary the results had no differences, then did others case with two step adapt. of course, for last case, i check it again and didn't see any change.

also, you can adapt in the mesh softwarte or in the ansys

August 12, 2013, 06:45	Grid sensitivity	#1
Riki New Member TAK Join Date: Aug 2013 Location: China Posts: 9 Rep Power: 13	Hey. I am simulating 2d airfoil (very low reynolds number, laminar, incompressible, transient flow). I am comparing my results (CL) to some published work. I want to know about grid sensitivity rule. I mean for every angle of attack first I have to use unrefined mesh and get converged result and then check different refine meshes to make it grid independent or just at initial few angle of attacks i should find the best refine mesh and will use it throughout? Also, I have to refine the mesh in my meshing software (ICEM CFD in my case) or just refining in Fluent is enough (with "Adapt" option)? My english is not very well, sorry for that.. Please clear my idea about this.. I will appreciate if someone correct me if i am wrong or add more about this. thanks in advance

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August 17, 2013, 08:20		#2
Barzanoni New Member Yaser Join Date: May 2013 Location: I. R. Iran, Tehran Posts: 20 Rep Power: 13	hi Riki i had a similar problem as yours, at first, at first, i refined my mesh with ansys for first and second angel of attack, and check mesh dependency and found that with two step mesh adapt on the boundary the results had no differences, then did others case with two step adapt. of course, for last case, i check it again and didn't see any change. also, you can adapt in the mesh softwarte or in the ansys