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Using forceCoeffs with multiphaseEulerFoam

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Old   August 9, 2022, 11:38
Default Using forceCoeffs with multiphaseEulerFoam
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Hi everyone,

I am working on a multiphase simulation with multiphaseEulerFoam and I would like to use OpenFOAM's post-processing function forceCoeffs.
I am calling it in the controlDict like:

        type forceCoeffs;
        functionObjectLibs ("");
        patches (walls);
        rhoInf 1.225;
        CofR (0.25 0 0);
        liftDir (0 1 0);
        dragDir (1 0 0);
        pitchAxis (0 0 1);
        magUInf 10.0;
        lRef 1;
         Aref 0.01;

         rho rhoInf;
        U U.gas;
I am getting the following error message:
No valid model for viscous stress calculation
I checked the source code to find out where the error is generated (l. 277 in functionObjects/forces/forces/forces.C). To avoid the error I have tried adding a transportProperties file with the following content:

transportModel  Newtonian;
rho             [1 -3 0 0 0 0 0] 1;
nu              [0 2 -1 0 0 0 0] 1e-05;
However, this did not solve the issue. Has anyone successfully used forceCoeffs in combination with multiphaseEulerFoam or could give me a hint on how to make them work together?
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