[.bastian]

Hi.

I am trying to set up a compressible MRF case using steadyUniversalMRFFoam or steadyCompressibleMRFFoam as a part of foam-extend 4.1.

In the boundary conditions I have specified a mass flow for the velocity at the inlet. During the first runs I noticed that the boundary condition seems to be not properly applied. As can be seen on the plot, the inlet mass flow is anything but constant.

My boundaries are defined as following:

0/U

inlet
    {
        type            flowRateInletVelocity;
        flowRate        0.177777777778;
        value           uniform (0 0 -20);
    }
outlet
    {
        type            zeroGradient;
    }

0/p

inlet
    {
        type            totalPressure;
        rho             rho;
        psi             none;
        gamma           1.693;
        p0              uniform 28500000;
        value           uniform 28500000;
    }
outlet
    {
        type            fixedValue;
        value           uniform 29706129.152;
    }

Any idea what i'm doing wrong?