|March 17, 2017, 10:51||
Matching OpenFOAM to ANSYS CFX results
Join Date: Mar 2015
Posts: 6Rep Power: 4
Recently started learning OpenFOAM. I am trying to define the inlet turbulence exactly how I have it in ANSYS CFX.
In CFX I have used Medium, which means 5% intensity and a viscosity ratio μ_t/μ equal to 10.
In OpenFOAM I have used Intensity and Length Scale:
mixingLength 0.021; //0.07 x Hydraulic Diameter
It's kOmegaSST turbulence model BTW.
I know the problem is in the k and omega specification because if I specify them as fixed values, OpenFOAM and CFX give identical results.
So my questions are:
1) Is it possible in OpenFOAM to specify the intensity and the viscosity ratio instead of length scale?
2) If not, can I calculate turbulent length scale from the viscosity ratio?
3) Maybe I should'n stick to the CFX's default turbulence setting and there is a better way of estimating the turbulence values for the inlet?
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