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Description of 
turbulence model
- Turbulence models and its parameters are set in file turbulenceProperties in directory constant
- Open e.g.:
# cat $FOAM_TUTORIALS/incompressible/simpleFoam/pitzDaily/\
constant/turbulenceProperties/*--------------------------------*- C++ -*----------------------------------*\ | ========= | | | \\ / F ield | OpenFOAM: The Open Source CFD Toolbox | | \\ / O peration | Version: dev | | \\ / A nd | Web: www.OpenFOAM.org | | \\/ M anipulation | | \*---------------------------------------------------------------------------*/ FoamFile { version 2.0; format ascii; class dictionary; location "constant"; object turbulenceProperties; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // simulationType RAS; RAS { // Tested with kEpsilon, realizableKE, kOmega, kOmegaSST, v2f, // ShihQuadraticKE, LienCubicKE. RASModel kEpsilon; turbulence on; printCoeffs on; } // ************************************************************************* // - RASModel selects turbulence model
- kEpsilon means two equation model
turbulence on;
- Parameter turbulence can switch turbulence modeling on or off (on/off )
printCoeffs on;
- Parameter printCoeffs says if model coefficients are printed at start of the computation (on/off )
/*---------------------------------------------------------------------------*\ | ========= | | | \\ / F ield | OpenFOAM: The Open Source CFD Toolbox | | \\ / O peration | Version: dev | | \\ / A nd | Web: www.OpenFOAM.org | | \\/ M anipulation | | \*---------------------------------------------------------------------------*/ Build : dev-e2ccbbbb Exec : simpleFoam Date : Sep 15 2017 Time : 11:59:59 Host : $HOSTNAME PID : $$ Case : $FOAM_RUN/pitzDaily nProcs : 1 sigFpe : Enabling floating point exception trapping (FOAM_SIGFPE). fileModificationChecking : Monitoring run-time modified files using timeStampMaster allowSystemOperations : Disallowing user-supplied system call operations // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // Create time Create mesh for time = 0 Reading field p Reading field U Reading/calculating face flux field phi Selecting incompressible transport model Newtonian Selecting RAS turbulence model kEpsilon kEpsilonCoeffs { Cmu 0.09; C1 1.44; C2 1.92; C3 0; sigmak 1.0; sigmaEps 1.3; } ... - Parameter kEpsilonCoeffs is optional and can change the default model coefficients in file turbulenceProperties
kEpsilonCoeffs { Cmu 0.09; C1 1.44; C2 1.92; C3 0; sigmak 1.0; sigmaEps 1.3; }