The value you specify for a wall function is only an initial guess (as it is the initial value for the internal field), so theoretically speaking it could be quite arbitrary. The value specified for a wall function, should it be the value at the wall (k=0.) or at the first grid point let's say at 40 y+? So I hope it is not to annoying to ask you a simple question: I am afraid, but I am new both to CFD in general and to OpenFoam in particular.Īs I just mentioned, I'm new to CFD and OpenFoam. If you want to use kOmegaSST it is clear that you need to specify omega instead of epsilon. Have a look at the code in your Openfoam directory /src/turbulenceModels/incompressible/RAS/derivedFvPatchFields/wallFunctions for details and further wall functions. Furthermore there are Wall Functions for nut (implying that you want to do incompressible calculations), such as nutWallFunction or nutSpalartAllmarasWallFunction. what means type zerogradient? The variabel will not change in that boundary?Īs far as I know you can use kqRWallFunction for k, epsilonWallFunction for epsilon and omegaWallFunction for omega. Are there more wallfunctions for the k-omega-SST model? For the k-epsilon-model I can use kqRWallFunction for k and for epsilon I can use epsilonWallFunction? Type turbulentIntensityKineticEnergyInlet īut relating to the wallfunctions I need a little bit more support, please. TurbulentMixingLengthDissipationRateInlet for epsilon in the inlet (then description mixing length and value) TurbulentMixingLengthFrequencyInlet for omega in the inlet (then description mixing length, k and value) TurbulentIntensityKineticEnergyInlet for k in the inlet (under that you make the description of the intensity and the value) Also for these three variables I found some functions: You don´t know, how you helped me with that information :-). Thank you very much! Now I could calculate epsilon, k and omega. Calculation of k, epsilon and omega - CFD Online Discussion Forums
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