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k and omega at inlet for k-omega SST

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Old   March 17, 2017, 11:38
Default k and omega at inlet for k-omega SST
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Audrius
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Hello Everyone,

I have just started using OpenFOAM and got into some issues trying to specify identical inlet conditions to ANSYS CFX.

In CFX I was using 'Medium' turbulence, which is 5% intensity and viscosity ratio μ_t/μ equal to 10.

In OpenFOAM I have found a way to specify the Intensity in k using turbulentIntensityKineticEnergyInlet and length scale in omega using turbulentMixingLengthFrequencyInlet. For the length scale I have specified 0.07 x Hydraulic Diameter.

Now this does not give me identical results to CFX. I know this discrepancy is because of k and omega values at the inlet. When I specify k and omega as fixed values, I get identical results in OpenFOAM and in CFX.

So my questions are:

1) Is there a way to specify viscosity ration in OpenFOAM?
2) Is there a way of estimating the length-scale from the viscosity ratio?

Many thanks,
Audrius
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