# K omega SST equations in Openfoam

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 March 13, 2020, 07:09 K omega SST equations in Openfoam #1 Member   Tom Join Date: Apr 2017 Posts: 37 Rep Power: 4 Hi All, I'm looking at the k-mega SST equations for the value of omega in openfoam and i noticed that two different equations are used: The standard omega= k^0.5/CMu*L https://www.openfoam.com/documentati...omega-sst.html And theturbulentMixingLengthFrequencyInlet https://www.openfoam.com/documentati...frequency.html where omega is defined as omega =Cmu^0.75* k^1.5/L My question is why there are two different definitions of omega and which is correct to use for turbo-machinery internal flows?

 March 13, 2020, 23:49 #2 New Member   Join Date: Mar 2009 Posts: 20 Rep Power: 14 (k^3/2*cmu^3/4)/L is the expression for epsilon. Using SI units, it results m^2/s^3. And I think that the other expression is wrong. Omega is equal to epsilon/(cmu*k). So, omega=k^1/2/(cmu^1/4*L). This expression results s^-1 in SI units. vatavuk likes this.

 Tags k-omega-sst, modelling, turbulence