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Stability problems with kepsilon in external aero

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Old   June 11, 2008, 19:46
Default Hey guys, I have recently r
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Ryan Middleton
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Hey guys,

I have recently run a heap of 3D airfoils and have got some good results. I turn the turbulence off for around 400 iterations, and after that k and epsilon converge nicely. I think I have narrowed my error down to the "transformPoints" function in OpenFOAM. I was originally creating meshes in GAMBIT in mm, then converting this to FOAM and then scaling the mesh down to metres using:

transformPoints <root> <case> -scale "(0.001 0.001 0.001)"

Doing this gave poor results. What I did in the past couple of runs was to create the mesh in GAMBIT in metres, therefore I didnt need to use transformPoints in FOAM. Doing this I have got excellent conergence with both incompressible and compressible solvers. I am getting drag coefficients between 0.01-0.02 for my airfoils, which is very reasonable.

Dont know if this will help any of you, but thought I would post it.

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Old   July 16, 2008, 15:00
Default Hi Ryan, I'm also intereste
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Patrice Castonguay
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Hi Ryan,

I'm also interested in simulating the flow over wings. Do you think you could post one of your case or send it by email. It would be really useful.

Thank you

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