[nikoscham]

Hi, I am trying to simulate a conjugate heat transfer problem with four solid regions heated by six propeller fans (simulated as MRF zones).

I have created my geometry using snappyHexMesh. I have also declared the MRF zones at the snappyHexMeshDict, e.g. for the first MRF zone in the refinementSurfaces sub-dictionary:

AMI1
        {
            level (1 1); 
            cellZone rotatingZone1;
            faceZone rotatingZone1;
            cellZoneInside inside;
        }

After the mesh creation, I execute:

splitMeshRegions -cellZones -overwrite

in order to split the domain into regions. Finally I end up with one fluid (Air) and four solid regions, as I wanted. The MRF zones are located in the fluid region.
The rotation velocity is declared at the MRFProperties (in constant\Air), e.g. for the first MRF zone:

MRF1
{
    cellZone    rotatingZone1;
    active      yes;

    // Fixed patches (by default they 'move' with the MRF zone)
    nonRotatingPatches ();

    origin      (2.59793 3.940 11.37112);
    axis        (0.0 1.0 0.0);
    omega       -120;
}

Finally, I start the chtMultiRegionFoam solver where it informs me that it has detected all the MRF regions. So far, so good:

Adding MRF

Creating MRF zone list from MRFProperties
    creating MRF zone: MRF1
    creating MRF zone: MRF2
    creating MRF zone: MRF3
    creating MRF zone: MRF4
    creating MRF zone: MRF5
    creating MRF zone: MRF6
    Adding fvOptions

The problem is solved, unfortunately however, the velocity field is zero.. It seems that MRF is not working.
I note here that the same configuration (with a similar snappyHexMeshDict and MRFProperties) is working perfectly with the simpleFoam solver (just for the flow problem in this case).

My openFoam version is v2012. Any clues of what is missing? Thanks in advance!
Nikos

[nikoscham]

If anyone is interested, I have found a solution for this problem. I realized that the MRF cellZones weren't defined. So, I defined them manually by using topoSet.

[Pappelau]

A short note on your Problem + Fixing,

you can work with splitMeshRegions -cellZonesfile to specifiy a cellzone file where u have fluid + 4 solids and actually your "realfile" also holds the mfrs from snappyHex then you can keep the mfrzones during splitting !

greetings