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January 13, 2014, 13:07 
Production limiter only used for k  kOmegaSST  OpenFOAM 2.2.x

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I'm trying to understand which version of Menter's komega SST turbulence model OpenFOAM 2.2.2 is using.
Looking at the incompressible komega SST model, the production limiter is only added to the k equation. Code:
// Turbulent kinetic energy equation tmp<fvScalarMatrix> kEqn ( fvm::ddt(k_) + fvm::div(phi_, k_)  fvm::laplacian(DkEff(F1), k_) == min(G, c1_*betaStar_*k_*omega_) // Production limiter  fvm::Sp(betaStar_*omega_, k_) ); Code:
// Turbulent frequency equation tmp<fvScalarMatrix> omegaEqn ( fvm::ddt(omega_) + fvm::div(phi_, omega_)  fvm::laplacian(DomegaEff(F1), omega_) == gamma(F1)*S2 // No limiter  fvm::Sp(beta(F1)*omega_, omega_)  fvm::SuSp ( (F1  scalar(1))*CDkOmega/omega_, omega_ ) ); I found a bug report on the same topic, but I don't think it provides a answer to the question. http://openfoam.org/mantisbt/view.php?id=286 Thanks in advance. 

January 21, 2014, 16:40 

#2 
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Eric Robertson
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...........
Last edited by msuaeronautics; February 16, 2014 at 21:33. 

January 21, 2014, 22:19 

#3 
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Eric Robertson
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The NASA resource states that Menter required production limiters on both equations, but his actual 2003 paper only seems to call for the limiter on k. So, I suppose that the code only does what's been called for.
Last edited by msuaeronautics; February 16, 2014 at 21:33. 

January 22, 2014, 01:50 

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I have compared Fluent's and OFs' kwsst model. and found always the OF value of w is higher than Fluent' s w.(between 10 to 100 times).
but other fields (k U p) is very close to Fluent ones. I think this thread is the reason of higher w in OF 

January 22, 2014, 11:04 

#5 
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Eric Robertson
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Can you provide some data showing this?


January 30, 2014, 14:05 

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OK
I will provide some examples,as soon as possible 

February 20, 2014, 06:33 

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I'm also interested in why the production limiter is not used in the omega equation, or indeed if it should be.
Does anyone know where the correction referred to on the NASA website comes from? Could it be the following reference (I don't have access to this so cannot check, does anybody else?), or is it just knowledge that Chris Rumsey has? (who is curator of the NASA page). Menter, Florian R. "Review of the shearstress transport turbulence model experience from an industrial perspective." International Journal of Computational Fluid Dynamics 23.4 (2009): 305316. There is another bug report about the same issue and it seems the developer (Sergio) decided there is not a published paper to base the correction on: http://openfoam.org/mantisbt/view.php?id=486 

March 3, 2014, 18:11 

#8 
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Eric Robertson
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I have personally tried using a custom limiter on omega, which appears to keep omega in check, but introduces some nonphysical elements (like hotspots in TKE). Will have to do further testing.


September 21, 2015, 08:55 

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Hello all,
the omegaequation has changed with 2.3.x: Code:
// Turbulent frequency equation tmp<fvScalarMatrix> omegaEqn ( fvm::ddt(omega_) + fvm::div(phi_, omega_)  fvm::laplacian(DomegaEff(F1), omega_) == gamma(F1) *min(S2, (c1_/a1_)*betaStar_*omega_*max(a1_*omega_, b1_*F23()*sqrt(S2)))  fvm::Sp(beta(F1)*omega_, omega_)  fvm::SuSp ( (F1  scalar(1))*CDkOmega/omega_, omega_ ) ); Best regards, Kate Quote:


Tags 
komega sst, production limiter, turbulence models 
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