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December 19, 2017, 13:50 |
non-orthogonal mesh problem
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New Member
Luca Montagliani
Join Date: Nov 2017
Posts: 5
Rep Power: 8 |
Hi guys,
Thank you for the help you can give me. I have to build a mesh around an airfoil with gmsh and then run a simulation with OpenFOAM (v5). Once the mesh is built and imported into OpenFOAM, I run checkMesh to verify that everything is OK, but it turns out that no-orthogonality is not respected. The log is: ---------------------------------------------------------------------------------- Create time Create mesh for time = 0 Time = 0 Mesh stats points: 454960 internal points: 0 faces: 906818 internal faces: 451858 cells: 226446 faces per cell: 6 boundary patches: 4 point zones: 0 face zones: 0 cell zones: 1 Overall number of cells of each type: hexahedra: 226446 prisms: 0 wedges: 0 pyramids: 0 tet wedges: 0 tetrahedra: 0 polyhedra: 0 Checking topology... Boundary definition OK. Cell to face addressing OK. Point usage OK. Upper triangular ordering OK. Face vertices OK. Number of regions: 1 (OK). Checking patch topology for multiply connected surfaces... Patch Faces Points Surface topology Left&Right 452892 454960 ok (non-closed singly connected) Body 596 1192 ok (non-closed singly connected) In 256 514 ok (non-closed singly connected) Out 1216 2434 ok (non-closed singly connected) Checking geometry... Overall domain bounding box (-9.569 -10 -0.1) (15 10 0) Mesh has 3 geometric (non-empty/wedge) directions (1 1 1) Mesh has 3 solution (non-empty) directions (1 1 1) Boundary openness (2.23116e-18 -1.32643e-18 7.69188e-20) OK. Max cell openness = 2.3566e-16 OK. Max aspect ratio = 377.225 OK. Minimum face area = 6.5753e-07. Maximum face area = 0.100058. Face area magnitudes OK. Min volume = 6.5753e-08. Max volume = 0.0100058. Total volume = 44.8375. Cell volumes OK. Mesh non-orthogonality Max: 83.81 average: 8.67972 *Number of severely non-orthogonal (> 70 degrees) faces: 8. Non-orthogonality check OK. <<Writing 8 non-orthogonal faces to set nonOrthoFaces Face pyramids OK. Max skewness = 0.946479 OK. Coupled point location match (average 0) OK. Mesh OK. End --------------------------------------------------------------------------- I would like to have some suggestions to solve this problem and to increase the quality of the mesh. I also report the geometry. |
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gmsh, non-orthogonal, openfoam |
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