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October 23, 2019, 13:18 |
Non-orthogonal cells checkMesh
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Member
Nat K
Join Date: Oct 2017
Posts: 68
Rep Power: 9 |
Hi,
I am simulating the flow within a cone-plate rheometer (see attached image for geometry). The red region is the fluid which I am simulating and is being meshed using blockMesh. I tried to create the mesh in blocks using an O-grid method. I am able to mesh the geometry, however, I tend to get a large mesh non-orthogonality value (89) and there are several non-orthogonal faces when I use checkMesh (see below). I have viewed the areas where this occurs I can see these occur at the truncated region as it is a very small region compared to the size of the domain. How can I reduce the non-orthogonality in this region? checkMesh log Code:
Create time Create polyMesh for time = 0 Time = 0 Mesh stats points: 10220451 faces: 30220000 internal faces: 29780000 cells: 10000000 faces per cell: 6 boundary patches: 3 point zones: 0 face zones: 0 cell zones: 2 Overall number of cells of each type: hexahedra: 10000000 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 airInterface 40000 40800 ok (non-closed singly connected) plate 200000 200401 ok (non-closed singly connected) cone 200000 200401 ok (non-closed singly connected) Checking geometry... Overall domain bounding box (-0.02 -0.02 0) (0.02 0.02 0.0006983) Mesh has 3 geometric (non-empty/wedge) directions (1 1 1) Mesh has 3 solution (non-empty) directions (1 1 1) Boundary openness (-3.56487e-17 -2.98897e-17 -2.97265e-15) OK. Max cell openness = 1.33522e-15 OK. Max aspect ratio = 177.943 OK. Minimum face area = 8.74406e-13. Maximum face area = 1.09776e-08. Face area magnitudes OK. Min volume = 9.2687e-19. Max volume = 9.87975e-14. Total volume = 5.7744e-07. Cell volumes OK. Mesh non-orthogonality Max: 89.2769 average: 9.76535 *Number of severely non-orthogonal (> 70 degrees) faces: 84000. Non-orthogonality check OK. <<Writing 84000 non-orthogonal faces to set nonOrthoFaces Face pyramids OK. Max skewness = 0.437164 OK. Coupled point location match (average 0) OK. Mesh OK. End Thanks |
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block mesh, non orthogonal |
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