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[Gmsh] 100 % under-determined cells with gmsh |
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August 31, 2015, 20:55 |
100 % under-determined cells with gmsh
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#1 |
Member
Hilbert
Join Date: Aug 2015
Location: Australia
Posts: 50
Rep Power: 10 |
Dear Foamers
I am quite new to the world of openfoam, and opensource mesh generation, so bear with me if my problem is trivial. I have been playing around with gmsh to replace icem which i am currently using. I am currently looking at square tutorial which is on the openfoam wiki (https://openfoamwiki.net/index.php/2...ial_using_GMSH). If I mesh the .geo file of that tutoial, convert that mesh to openfoam and then run checkMesh -allGeometry i get the following problem: Cell determinant (wellposedness) : minimum: 0 average: 4.84831e-35 ***Cells with small determinant (< 0.001) found, number of cells: 940 The entire mesh consists of 940 cells, so all of them are underdetermined. I have checked the mesh with the solvers that I want to use, and they do complain about this, so I do need a solution. Had anybody seen this before/ has an idea of how to solve it? |
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September 3, 2015, 21:48 |
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#2 |
Member
Hilbert
Join Date: Aug 2015
Location: Australia
Posts: 50
Rep Power: 10 |
I have made a bit of progress on this. If after the meshing step i run a refine step (gmsh mymesh.msh -refine) the tutorial mesh seems oke.
If i do the same for the geometry that i am interested in I am still left with about 10 bad cells. If I run the refine step again it will create the double amount of bad cells. Does anybody have a suggestion on how to remove the bad cells without increasing the cell count by a great deal? (I set the cells size really small I can reduce the number of bad cells by a couple but this leads to huge meshes which aren't necessary for what i want to do with it ) |
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