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May 22, 2018, 05:15 |
Setting change from k omega to k omega SST
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#1 |
New Member
bingjr
Join Date: May 2018
Posts: 3
Rep Power: 8 |
Dear Openfoam users,
I am doing the simulation of a diffuser with simplefoam and turbulence model. I have tried several times both by k omega and k omega SST, but no result makes sense. In terms of the k omega model, the inlet velocity profile is wrong. In terms of the k omega SST model, I have got many different weird results (most of them has irregular vortex or singularity with larger velocity). Here are my settings for simulation. k: fixedvalue (a small value like 1*10^-12) omega: omegaWallFunction nut: calculated 0 (I also tried nutUSpaldingWallFunction) boundary: top : wall bottom: wall inlet: patch outlet: patch frontAndBack: empty fvschemes: ddtSchemes { default steadyState; } gradSchemes { default Gauss linear; } divSchemes { default none; div(phi,U) bounded Gauss linearUpwind grad(U); div(phi,k) bounded Gauss linearUpwind grad(k); (also tried //limitedLinear 1;//linearUpwind grad(k) [/U][/I][/I] div(phi,omega) bounded Gauss linearUpwind grad(omega); // limitedLinear 1;//linearUpwind grad(omega); div((nuEff*dev2(T(grad(U))))) Gauss linear; } laplacianSchemes { default Gauss linear corrected; } interpolationSchemes { default linear; } snGradSchemes { default corrected; } wallDist { method meshWave; } // ************************************************** *********************** // Could you please tell me what I should change? Thanks! |
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