Cubit 16.04 User Documentation
One technique for creating a symmetric mesh on a symmetric model is to mesh only half of the volume, then copy the mesh onto the other half. The following example employs this technique. This model at first appears quite simple, but it actually requires a good deal of webcutting to get a reasonable mesh that is not highly skewed.
| Webcut | Command |
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CUBIT> webcut body 1 with plane xplane offset 0 CUBIT> delete body 2 |
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CUBIT> webcut body 1 with cylinder radius 2.75 axis y |
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CUBIT> webcut body 1 3 with plane yplane offset 0 |
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CUBIT> webcut body 1 with plane yplane offset -15 |
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CUBIT> webcut body 1 6 4 with plane surface 64 |
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CUBIT> webcut body 1 with plane surface 67 |
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CUBIT> webcut body 5 with plane zplane offset 1.5 CUBIT> webcut body 11 with plane zplane offset -1.5 |
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CUBIT> create vertex on curve 540 distance 2 from vertex 368 CUBIT> webcut body 4 with plane vertex 409 vertex 410 vertex 630 |
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CUBIT> create vertex on curve 1093 distance 3 from vertex 646 CUBIT> webcut body 14 with plane vertex 570 vertex 569 vertex 647 This wedge shape webcut is a method of controlling skew in the final mesh. |
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CUBIT> unite body 5 11 12 |
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CUBIT> unite body 4 13 CUBIT> delete vertex all CUBIT> imprint all CUBIT> merge all CUBIT> vol all size .5 |
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CUBIT> surf 229 size .25 CUBIT> mesh surf 229 CUBIT> volume 5 scheme sweep source 229 target 230 CUBIT> mesh volume 5 |
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CUBIT> volume 4 scheme sweep source surface 526 target 528 CUBIT> mesh volume 4 |
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CUBIT> volume 14 scheme sweep source 543 target 541 CUBIT> mesh volume 14 CUBIT> delete mesh CUBIT> unmerge all |
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CUBIT> webcut body 6 with plane surface 524 |
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CUBIT> unite body 16 17 |
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CUBIT> webcut body 8 with plane surface 524 |
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CUBIT> webcut body 18 with plane surface 540 |
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CUBIT> webcut volume 9 with plane zplane offset -3 rotate 5 about x This is another effort to prevent skew in the final mesh CUBIT> imprint all CUBIT> merge all |
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CUBIT> mesh volume 5 (swept around) CUBIT> mesh volume 4 (mapped) CUBIT> mesh volume 14 (swept top to bottom) CUBIT> volume 15 scheme map CUBIT> curve all in volume 15 size 0.5 CUBIT> mesh volume 15 |
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CUBIT> volume 18 scheme tetprimitive CUBIT> volume 18 interval 3 CUBIT> mesh volume 18 |
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CUBIT> volume 9 scheme sweep source surface 579 601 target surface 592 rotate off CUBIT> mesh volume 9 CUBIT> mesh volume 20 |
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CUBIT> volume 6 scheme sweep source 569 target 570 CUBIT> mesh volume 6 |
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CUBIT> volume 3 scheme sweep source 224 target 226 CUBIT> surf 224 226 scheme map CUBIT> mesh volume 3 |
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CUBIT> volume 19 scheme sweep source 543 target 586 CUBIT> mesh volume 19 |
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CUBIT> volume 17 scheme sweep source 545 583 582 target 239 CUBIT> mesh volume 17 |
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CUBIT> volume 8 scheme sweep source 574 597 601 target 241 CUBIT> mesh volume 8 |
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CUBIT> volume 7 1 size 2 CUBIT> volume 7 1 scheme auto |
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CUBIT> volume 10 scheme sweep source 270 target 267 CUBIT> mesh volume 7 1 CUBIT> mesh volume 10 |
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CUBIT> unmerge all CUBIT> body all copy reflect x CUBIT> merge all |
The entire mesh is copied and reflected around the x axis during the last step. The advantage of symmetry in this example is that it cuts the decomposition in half, and it also ensures a perfectly symmetrical mesh.
