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Old   June 22, 2011, 10:10
Default mergeMeshes hex + tet
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Hello,

I want to do mergeMeshes on a hex and a tet mesh, see picture. Is this possible? When I run
mergeMeshes . grid1 .grid2
I get
Code:
Master:      "." "grid1"  region region0
mesh to add: "." "grid2"  region region0

Create Times
Reading master mesh for time = 0
Create mesh

--> FOAM Warning : 
    From function directTopoChange::addMesh(const polyMesh&, const labelList&,const labelList&, const labelList&,const labelList&)
    in file directTopoChange/directTopoChange/directTopoChange.C at line 2281
Segmentation fault
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Old   June 22, 2011, 10:24
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Steven van Haren
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You need to have a conformal interface as far as I know.

This is not the case for you. I don't know how you made the mesh, but maybe you can retry with a conformal interface. I think it will work than.
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Old   June 22, 2011, 16:16
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Logan Page
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You can create nice hybrid structured / unstructured meshes with gmsh (tho it can take a while to setup for more complex geometries). This also imports into OpenFOAM quite nicely.
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Old   June 23, 2011, 03:45
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Arne Stahlmann
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Quote:
I want to do mergeMeshes on a hex and a tet mesh, see picture. Is this possible?
I don't know the source of your error message, but it is generally possible to merge tet + hex meshes and use them in OF, see attached picture. I made this using blockMesh, salome, engrid, mergeMeshes and stitchMesh.
Generally I would not recommend it, as you can get a lot of trouble using tet meshes (at least when using the interFoam solver). You could try snappyHexMesh instead.



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Old   June 23, 2011, 10:14
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kshitij neroorkar
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I know you can have non-conformal interfaces using ggi patches, but I am not sure if it is alright to have one side hex and another side tet. Does anyone know about this?
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Old   June 23, 2011, 11:10
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GGI doesn't really care about cell-topology on either side. The only limitation is that patch faces be convex, because of a limitation in the intersection algorithms.
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Old   June 23, 2011, 11:53
Default A little explanation
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Thanks for the many replies.

A little explanation: I made a tet mesh around a foil inside a circle with gmsh. Now I want to add layers on the foil surface. As far as I know, this cannot be done in gmsh, because the foil is an extrude spline profile.

If I use
refineWallLayer -overwrite airfoil 0.3
I get a bad layer with skew cells, see picture.

So any suggestions on how to ad these layers?
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Old   June 23, 2011, 12:03
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Quote:
A little explanation: I made a tet mesh around a foil inside a circle with gmsh. Now I want to add layers on the foil surface
If you just want to add layers, you might become happy with engrid! On simple structures, I achieved good results with this tool (which is not part of OF!). But it only seems to work for 3D cases - I don't know what your case is.

RefineWallLayers might not be a good choice in your case, as it just splits your surrounding cells.
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