[michael157]

Hello,

I have a problem in setting up a chtMultiRegionFoam case with snappyHexMesh.
Following these steps i did:

- blockMesh with a block 50mmx50mmx50mm
- loaded stl for fluid and for solid region (fluid region cube 50x50x50 and solid a plate 2x10x10)
- SnappyHexMesh is then running and finishes without any error
- When I am doing splitMeshRegions I got a result which i don understand. I get two domains which is correct but for the fluid domain i got domain0 as name but I think i have specified that this domain should be named "air".

Has anybody any idea what am I doing wrong?
Thanks very much in advance for your help.

[dzi]

Hi michael,
you could try to give a name for that region in blockMeshDict like

...
blocks          
(
hex (0 1 2 3 4 5 6 7) myfluidname (10 10 10 ) simpleGrading (1 1 1)
);
...

I believe, if your block has the same dimensions like the stl, you dont have to read the fluid.stl. Maybe this is confusing for shm.
best dirk

[michael157]

Hi dirk,
thanks for your help. I now get only two regions but it is a bit strange how this is done.

I have the following situation. A plate is the solid domain (with contact to two sides min_X and max_X two the boundary) as you can see in the picture 01.jpg and the surrounding is the fluid domain.

My blockMeshDict looks as follows:
------------------------------------------------
blocks
(
hex (0 1 2 3 4 5 6 7) air (10 10 10) simpleGrading (1 1 1)
);
------------------------------------------------
so I think the fluid domain is defined well.

The solid domain is defined with an STL file named platte.stl.

--------------------------------------------------
geometry
{ platte.stl
{
type triSurfaceMesh;
name platte;
}
};

castellatedMeshControls
{
maxLocalCells 100000;
maxGlobalCells 2000000;
minRefinementCells 10;
maxLoadUnbalance 0.10;
nCellsBetweenLevels 1;
resolveFeatureAngle 80;

features
(
{
file "platte.eMesh";
level 1;
}
);

refinementSurfaces
{
platte
{
level (3 6);
faceZone platte;
cellZone platte;
cellZoneInside inside;
}
}
refinementRegions { }
locationInMesh (0 0 0);
allowFreeStandingZoneFaces true;
---------------------------------------------
I think the red highlighted text is how I define the second domain solid named platte.

In the /constant RegionProberties I have defined the following:
-----------------------------------
regions
(
fluid (air)
solid (platte)
);
-----------------------------------
so the air should be the fluid domain and the platte should be the solid domain.

What i got is quite strange (the colours stand for one region so red=region0 and blue=region1)
What am I doing wrong?

[michael157]

Hello,

I have solved the problem. The surfaces of the STL files has been orientated in two different direction (see picture). The colours stands for the orientation, grey orientation to the outside, yellow orientation to the inside.
That was the problem for that.

[dzi]

hi and sorry that I had no time to have a look at it so far ... but thanks for your update anyway!
regards dirk