# how to use 'turbFoam standard k-Epsilon ?'

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 October 22, 2009, 06:27 how to use 'turbFoam standard k-Epsilon ?' #1 Senior Member   Jiang Join Date: Oct 2009 Location: Japan Posts: 186 Rep Power: 9 Dear Foamers: I want to simulate the air flow across an single building . I try to use the standard k-Epsilon of turbFoam. This is my steps: 1. generate the mesh using ICEM in windows, and then save to *.msh; 2. using "fluentMeshToFoam *.msh -scale 0.001",convert to foam mesh; 3.checkMesh, no problem; 4.copy turorials/turbFoam/cavity to my case directory, delete the "nuTilda and R" files, note the nuTilda and R lines in fvSchemes file. divSchemes { default none; div(phi,U) Gauss limitedLinearV 1; div(phi,k) Gauss limitedLinear 1; div(phi,epsilon) Gauss limitedLinear 1; // div(phi,R) Gauss limitedLinear 1; // div(R) Gauss linear; // div(phi,nuTilda) Gauss limitedLinear 1; div((nuEff*dev(grad(U).T()))) Gauss linear; } laplacianSchemes { default none; laplacian(nuEff,U) Gauss linear corrected; laplacian((1|A(U)),p) Gauss linear corrected; laplacian(DkEff,k) Gauss linear corrected; laplacian(DepsilonEff,epsilon) Gauss linear corrected; // laplacian(DREff,R) Gauss linear corrected; // laplacian(DnuTildaEff,nuTilda) Gauss linear corrected; } 5. when I run , it displays the following mistakes: kEpsilonCoeffs { Cmu 0.09; C1 1.44; C2 1.92; alphaEps 0.76923; } Starting time loop Time = 0.0005 Courant Number mean: 0.0197359 max: 0.237347 DILUPBiCG: Solving for Ux, Initial residual = 1, Final residual = 1.2995e-06, No Iterations 1 DILUPBiCG: Solving for Uy, Initial residual = 1, Final residual = 1.91917e-09, No Iterations 2 DILUPBiCG: Solving for Uz, Initial residual = 1, Final residual = 7.8287e-09, No Iterations 2 DICPCG: Solving for p, Initial residual = 1, Final residual = 9.7326e-07, No Iterations 177 time step continuity errors : sum local = 1.35378e-10, global = 9.41494e-13, cumulative = 9.41494e-13 DICPCG: Solving for p, Initial residual = 0.0826107, Final residual = 9.50741e-07, No Iterations 158 time step continuity errors : sum local = 4.28276e-11, global = 1.23514e-13, cumulative = 1.06501e-12 DILUPBiCG: Solving for epsilon, Initial residual = 0.556573, Final residual = 1.13615e-06, No Iterations 2 DILUPBiCG: Solving for k, Initial residual = 1, Final residual = 2.70281e-07, No Iterations 3 ExecutionTime = 10.26 s ClockTime = 11 s It seems does not converge. because I'm newer , don't understand why. If it is because I haven't used turbFoam k-Epsilon correctly? I think it is only an simple case ,fluent can solve this easily, Why OpenFOAM has so many problem? Thank you very much.

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