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[Gmsh] Gmsh - unused points error and patches undefined

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Old   May 30, 2020, 04:00
Default Gmsh - unused points error and patches undefined
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Saideep
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Dear OF users,


I am trying to use GMSH to build the case used in the openfoamwiki.

https://openfoamwiki.net/index.php/2...ial_using_GMSH


This works for me. However, I then tried to change the triangulated mesh into unstructured quadrilaterals using the following procedure:
Tools-> Options -> Mesh -> General -> Subdivision Alg. -> All quads


I have a mesh as shown in the next post with which I am happy. Also all boundary patch are well defined in gmsh.


Then I export in ASCII2 format and run gmshToFoam. I have two issues in here.
1. checkMesh reports one check failed.

Code:
 ***Unused points found in the mesh, number unused by faces: 72 number unused by cells: 72
2. The top, bottom, left and right patches are defined though I defined it using physical surfaces in .geo file.

Code:
Checking patch topology for multiply connected surfaces...
    Patch               Faces    Points   Surface topology                  
    back                684      721      ok (non-closed singly connected)  
    left                0        0        ok (empty)                        
    top                 0        0        ok (empty)                        
    right               0        0        ok (empty)                        
    bottom              0        0        ok (empty)                        
    front               684      721      ok (non-closed singly connected)  
    defaultFaces        72       144      ok (non-closed singly connected)
Can anyone assist me in finding what am I doing wrong? For reference, I am using the same script mentioned in the above link but using different meshing as I mentioned above.



Thanks.

Last edited by Saideep; May 30, 2020 at 04:05. Reason: Forgot to add image - changed corresponding text
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Old   May 30, 2020, 04:04
Default Desired mesh image
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Saideep
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Apologies, forgot to add the figure in the above post. The desired mesh for me looks as shown in the attached image.
Attached Images
File Type: jpg Screenshot from 2020-05-30 09-53-15.jpg (151.4 KB, 3 views)
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gmsh, mesh 2d to 3d, unstructed mesh

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