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K-Omega SST BC set up for omega and K

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Old   July 6, 2017, 17:15
Default K-Omega SST BC set up for omega and K
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Joseph O'Neill
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Hi All,

I am attempting to set up a 2-D case for a NACA 4318 airfoil using HELYX-OS and OpenFOAM in an attempt to simply match data from both accepted NACA data and other CFD software, namely GHOST and STAR-CCM+.

I have managed to do this well using the Spallart-Allmaras model. My very basic setup (I have only been using OpenFOAM for just over a month) to begin with was a simple non-slip wall over the airfoil and slip walls at all other boundary conditions with uniform inlet velocity being approximately 23.45 m/s with a zero pressure gradient at the inlet and a zero gradient velocity and fixed value of 0 for pressure at the outlet. Using SA, these conditions worked relatively well for matching Cl and Cp (drag was still a bit off).

I have tried similar boundary conditions for the K-Omega SST model, and yield absurdly large values for both Cl and Cd so I'm fairly certain I'm mixed up on how to set up my boundary conditions for K-Omega SST with respect to OpenFOAM.

Could anyone help guide me along for a proper set up for the K-Omega SST model BC's? And help at all would be much appreciated! I'm currently paging through a few tutorials given by OpenFOAM to diagnose the issue, but again I am relatively new to this software and CFD as a whole so I'm not quite sure where to begin.

Regards,

Joe
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Old   July 10, 2017, 12:20
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Joshua
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This is an older post, so I am not sure how much has changed, but it is worth looking through.

Why Menter's SST model low-Re issue has not been seriously investigated?

There are also this post on CFD Online.

Near wall treatment in k-omega SST
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Old   July 10, 2017, 14:29
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Joseph O'Neill
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Josh,

Thanks! I'll give these a look through and try to implement what I find and I'll let you know what I cycle through and find out.

Best,

Joe
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