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March 5, 2011, 09:22 |
kOmegaSST_LowRe in OpenFOAM-1.5-dev
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#1 |
Senior Member
Join Date: Feb 2010
Posts: 213
Rep Power: 17 |
Hi, foamers.
I've always been using k-omega SST turbulent model with wall functions so far (with appropriate y+). Now I'm interested in a low Re model, I want to check how much it can affect my results. Maybe the difference is not so important for my case and my applications, in view of hardware and time consumption. If I'm correct, I can still use kOmegaSST OpenFOAM turbulent model and an appropriate finer mesh with a resulting y+≈1. But I also saw that OpenFOAM-1.5-dev implemented a kOmegaSST_LowRe. What's the difference with an usual kOmegaSST model with a y+≈1 mesh? Are there different settings for k and omega close to wall surfaces (I always use zeroGradient)? I looked for that in the forum but I couldn't find anything useful. Last edited by vaina74; March 18, 2011 at 03:19. |
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March 28, 2011, 15:15 |
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#2 |
Senior Member
Join Date: Feb 2010
Posts: 213
Rep Power: 17 |
I tried to run a simulation and I simply substitute kOmegaSST with kOmegaSST_LowRe in RASProperties, but I obtain an error:
Code:
Selecting incompressible transport model Newtonian Selecting RAS turbulence model kOmegaSST_LowRe [0] [1] [1] [1] keyword kOmegaSST_LowReCoeffs is undefined in dictionary "/home/maurizio/OpenFOAM/maurizio-1.5-dev/run/low_Re/propeller/processor1/constant/RASProperties" [1] [1] file: /home/maurizio/OpenFOAM/maurizio-1.5-dev/run/low_Re/propeller/processor1/constant/RASProperties from line 17 to line 188. [1] [1] From function dictionary::subDict(const word& keyword) [1] in file db/dictionary/dictionary.C at line 288. [1] FOAM parallel run exiting [1] [0] [0] keyword kOmegaSST_LowReCoeffs is undefined in dictionary "/home/maurizio/OpenFOAM/maurizio-1.5-dev/run/low_Re/propeller/processor0/constant/RASProperties" [0] [0] file: /home/maurizio/OpenFOAM/maurizio-1.5-dev/run/low_Re/propeller/processor0/constant/RASProperties from line 17 to line 188. [0] [0] From function dictionary::subDict(const word& keyword) [0] in file db/dictionary/dictionary.C at line 288. [0] FOAM parallel run exiting [0] [naospcm4:04902] MPI_ABORT invoked on rank 1 in communicator MPI_COMM_WORLD with errorcode 1 [naospcm4:04901] MPI_ABORT invoked on rank 0 in communicator MPI_COMM_WORLD with errorcode 1 |
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March 28, 2011, 16:11 |
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#3 |
Senior Member
Join Date: Feb 2010
Posts: 213
Rep Power: 17 |
OK, I solved. I included in RASProperties the following coefficients (suggested in kOmegaSST_LowRe.H):
Code:
kOmegaSST_LowReCoeffs { Cmu 0.09; alphaK1 0.85034; alphaK2 1.0; alphaOmega1 0.5; alphaOmega2 0.85616; alphah 1.0; // only for compressible beta1 0.075; beta2 0.0828; betaStar 0.09; gamma1 0.5532; gamma2 0.4403; a1 0.31; c1 10.0; } |
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