|March 17, 2017, 11:38||
k and omega at inlet for k-omega SST
Join Date: Mar 2015
Posts: 6Rep Power: 4
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?
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