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nut, k, omega wall condition with k omega SST |
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April 2, 2016, 10:09 |
nut, k, omega wall condition with k omega SST
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#1 |
Senior Member
Join Date: Mar 2016
Posts: 133
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Hi guys, i would like to understand if my assumptions are corrected. I have a mesh of an airfoil with y+ around wall <1. I want use k omega SST. This model considers flux turbulent fully developed, so i want to understand if i have to consider the flux like was in y+> 30 and then use wall functions?
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April 2, 2016, 12:47 |
nut, k, omega wall condition with k omega SST
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#2 | |
Senior Member
Join Date: Mar 2016
Posts: 133
Rep Power: 10 |
hi guys, i have a mesh with y+<1 a i use k omega SST. How you valutate this BC on wall? K_wall=1e-12 omega_wall=1e+7 according this post:
Quote:
Last edited by wyldckat; April 2, 2016 at 18:37. Reason: Added missing QUOTE markers |
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April 3, 2016, 04:29 |
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#3 |
Senior Member
Alex
Join Date: Jan 2014
Posts: 126
Rep Power: 12 |
You can use a very small, non-zero fixedvalue for k, omegawallfunction for omega and nutlowrewallfunction for nut. These are my preferred lowRe mesh wall BCs for the variables.
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April 3, 2016, 10:59 |
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#4 |
Senior Member
Join Date: Mar 2016
Posts: 133
Rep Power: 10 |
I've set nut to calculated. And I have a doubt if my fvschemes and fvsolution are correct:
Fv schemes ddtSchemes { default steadyState; } gradSchemes { default Gauss linear; } divSchemes { default none; div(phi,U) bounded Gauss linearUpwind grad(U); div(phi,k) bounded Gauss upwind; div(phi,omega) bounded Gauss upwind; div((nuEff*dev2(T(grad(U))))) Gauss linear; } laplacianSchemes { default Gauss linear corrected; } interpolationSchemes { default linear; } snGradSchemes { default corrected; } wallDist { method meshWave; } Fv solution solvers { p { solver GAMG; tolerance 1e-06; relTol 0.1; smoother GaussSeidel; nPreSweeps 0; nPostSweeps 2; cacheAgglomeration true; nCellsInCoarsestLevel 10; agglomerator faceAreaPair; mergeLevels 1; } U { solver smoothSolver; smoother GaussSeidel; nSweeps 2; tolerance 1e-08; relTol 0.1; } k { solver smoothSolver; smoother GaussSeidel; tolerance 1e-8; relTol 0.1; nSweeps 1; } omega { solver smoothSolver; smoother GaussSeidel; tolerance 1e-8; relTol 0.1; nSweeps 1; } } SIMPLE { nNonOrthogonalCorrectors 0; pRefCell 0; pRefValue 0; residualControl { p 1e-5; U 1e-5; k 1e-5; omega 1e-5; } } relaxationFactors { fields { p 0.3; } equations { U 0.3; k 0.3; omega 0.3; } } |
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