[Rotidpor]

Hello Foamers.


So I work on a case right now that involves 54 solid unconnected regions within a fluid region.
The problem is that I plan to do the huge calculation on a node that has 42 cores.
I would like to attribute to three cores 18 solid regions each so that the 39 remaining cores can work on CFD in the fluid region.


I tried the following workflow :


-Meshing all solids with cfMesh individually

-Then I created my three 18solid regions using mergeMesh -overwrite
-Then I created the three corresponding cellZones with topoSet.


-I then merged these three meshes into my fluid region mesh which was already topoSetted
-After this, I used : splitMeshRegions -cellZonesOnly -overwrite
-checkMesh told me that everything was fine unless a little warning for unconnected mesh regions.
-Then, when I try to : decomposePar -allRegions, I get this floating point error when he tries to construct processor meshes for the solid region :
"Cell 1contains face labels out of range: 6(6 7 8 9 -1 0) Max face index = 2215444"


Here is a bit of my checkMesh and my decomposeparDict : (I did a run test with only my fluid and two unconnected solid regions)



checkMesh :

The mesh has multiple regions which are not connected by any face.
<<Writing region information to "0/cellToRegion"
<<Writing region 0 with 771573 cells to cellSet region0
<<Writing region 1 with 333418 cells to cellSet region1
<<Writing region 2 with 333820 cells to cellSet region2

[...]

Checking basic cellZone addressing...
CellZone Cells Points VolumeBoundingBox
fluid 771573 934897 5.18368971 (-1.22889 -0.997725 -0.3482447631) (2.07346 0.971991 0.515783)
solid1_2 667238 883771 0.3893450275 (-0.811048 -0.6 -0.0135121) (1.58886 0.6 0.2221337304)



decomposeParDict :

numberOfSubdomains 20;

method scotch;


regions
{
solid1_2
{
numberOfSubdomains 1;
method simple;
coeffs {n (1 1 1);}
}
}



__________________________________________________ _


When I try to assign one processor to each solid region, everything works fine with this workflow.
Does anyone have any idea about what's going on ?
Thank you all for reading,


Fab