[Jan995]

Hi all,

I have a problem with decomposition or in fact, running the multi-region mesh with different decomposition values. For example, I have a huge fluid region - more than 100mio cells and small solid region (around 1mio cells). I decompose the fluid region to few thousand processors, but only decompose the solid region to around 100 processors.
Now, the problem is, that when doing that I obtain an error when running chtMultiRegionFoam that in the processor* folders there are no points for solid region. There are no points for some processors for solid region as I have decomposed it into fewer processors. Do I need to do another step when doing the decomposition? Decomposition of the solid region into several thousand processors is really not optimal and I would like to run with different decompositions for different regions. Is there a way?

[Tobi]

You can specify in the decomposeParDict to keep face regions. Never checked it out but it should be possible. https://github.com/OpenFOAM/OpenFOAM...composeParDict

However, mixing different numbers of processors does not work (I never heard that). Nevertheless, FOAM is decomposing in a way that each processor does have (more or less) the same amount of cells (e.g., using scotch decomposition method).