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Matching OpenFOAM to ANSYS CFX results

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Old   March 17, 2017, 10:51
Default Matching OpenFOAM to ANSYS CFX results
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Audrius
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Hello Everyone,

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:

For k

inlet
{
type turbulentIntensityKineticEnergyInlet;
intensity 0.05;
value $internalField;
}

For omega

inlet
{
type turbulentMixingLengthFrequencyInlet;
mixingLength 0.021; //0.07 x Hydraulic Diameter
value $internalField;
}

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?

Many thanks,
Audrius
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