6
2
1
5
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$ \color{white} \omega$ varying with height or radius

The widely used boundary condition for  40 1 in rotating machinery inlet is turbulentMixingLengthDissipationRateInlet.

omega:

 boundaryField
 {
".*_inlet"
    {
        type            compressible::turbulentMixingLengthDissipationRateInlet;
        mixingLength    0.1;
        phi             phi;
        k               k;
        value           $internalField;
    }
 }

For internal flows the parameter mixingLength is recommended to be equal to hydrostatic diameter of the pipe.

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