Turbulence model change

msha · September 25, 2007, 00:57

I'd like to use Q-Zeta turbulence model instead of k-epsilon.But I don't know how to do this.

Once I simply replaced "k" with "Q" and "Zeta" with "epsilon" in "fvshcemes" and set turbulence model to Q-Zeta in turbulenceproperties dictionary but it did not work.

Generally if someone wants to change turbulence model,what steps are required.

I appreciate any help in steps.

Any suggestions please.

cosimobianchini · September 25, 2007, 03:50

Hi Mojtaba,
first you have to select the chosen turbulence model on the turbulencePropertiesDict in constant/turbulenceProperties file. Remember to also set the right values for the coefficients in the turbulenceModelCoeffsSubDict. For your model simply define dimensionedScalar Cmu,C1,C2,alphaZ and a switch anisotropic.
Second you have to set up the proper fields needed by the model in the startTime directory (k and epsilon for kEpsilon, k and omega for kOmegaSST etc etc) with the proper boundary conditions. For the QZeta model you just need k and epsilon (have a look at the code in src/turbulenceModel/incompressible/QZeta).
Hope this is clear,
Regards
Cosimo

msha · September 28, 2007, 03:08

Hi Cosimo
Thank you for help
I'll do so.

Best regards.

September 25, 2007, 00:57	I'd like to use Q-Zeta turbul	#1
msha Member Mojtaba Shahmohammadian Join Date: Mar 2009 Posts: 73 Rep Power: 17	I'd like to use Q-Zeta turbulence model instead of k-epsilon.But I don't know how to do this. Once I simply replaced "k" with "Q" and "Zeta" with "epsilon" in "fvshcemes" and set turbulence model to Q-Zeta in turbulenceproperties dictionary but it did not work. Generally if someone wants to change turbulence model,what steps are required. I appreciate any help in steps. Any suggestions please.

September 25, 2007, 03:50	Hi Mojtaba, first you have to	#2
cosimobianchini Member cosimo bianchini Join Date: Mar 2009 Location: Florence, Tuscany, Italy Posts: 88 Rep Power: 17	Hi Mojtaba, first you have to select the chosen turbulence model on the turbulencePropertiesDict in constant/turbulenceProperties file. Remember to also set the right values for the coefficients in the turbulenceModelCoeffsSubDict. For your model simply define dimensionedScalar Cmu,C1,C2,alphaZ and a switch anisotropic. Second you have to set up the proper fields needed by the model in the startTime directory (k and epsilon for kEpsilon, k and omega for kOmegaSST etc etc) with the proper boundary conditions. For the QZeta model you just need k and epsilon (have a look at the code in src/turbulenceModel/incompressible/QZeta). Hope this is clear, Regards Cosimo __________________ Cosimo Bianchini Ergon Research s.r.l. Via Panciatichi, 92 50127 Florence - ITALY Tel: +39 055 0763716 Mob: +39 320 9460153 e-mail: cosimo.bianchini@ergonresearch.it URL: www.ergonresearch.it

September 28, 2007, 03:08	Hi Cosimo Thank you for help	#3
msha Member Mojtaba Shahmohammadian Join Date: Mar 2009 Posts: 73 Rep Power: 17	Hi Cosimo Thank you for help I'll do so. Best regards.

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