# Turbulent frequency equation for compressible kOmegaSST turbulence model

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 August 31, 2013, 10:36 Turbulent frequency equation for compressible kOmegaSST turbulence model #1 New Member   Bojan Sekutkovski Join Date: Oct 2012 Posts: 15 Rep Power: 5 Hi everybody, I have one question that concerns turbulent frequency equation in compressible kOmegaSST equation (I mean "omega equation")... There is the definition of SuSP term in Programmers Guide: SuSp(rho,phi) = rho*phi In turbulent frequency equation: fvm::SuSp ( rho_*(F1 - scalar(1))*CDkOmega/omega_, omega_ ) which (by the programmers guide) means: (rho_*(F1 - scalar(1))*CDkOmega/omega_)*omega_ My question: Why don't we simply write: rho_*(F1 - scalar(1))*CDkOmega ? Regards!

 September 6, 2013, 06:45 #2 Senior Member   Joachim Herb Join Date: Sep 2010 Posts: 383 Rep Power: 11 I guess this is part of the numeric magic of OpenFOAM: fvm::SuSp can be used to either add a source term explicitly or implicitly to an equation depending on the sign of the factor. This can improve the stability by increasing the diagonal dominance of the matrix. See for example here: http://www.foamcfd.org/Nabla/guides/...x14-410002.4.9 Bojan likes this.

 Tags compressible komegasst, komegasst, omega, omega equation

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