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必须是三角形或者四边形,具体参考帮助:
For an area to accept a mapped mesh, the following conditions must be satisfied:
1、The area must be bounded by either three or four lines (with or without concatenation).
2、The area must have equal numbers of element divisions specified on opposite sides, or have divisions matching one of the transition mesh patterns.
3、If the area is bounded by three lines, the number of element divisions must be even and equal on all sides.
4、The meshing key must be set to mapped [MSHKEY,1]. This setting results in a mapped mesh of either all quadrilateral elements or all triangle elements, depending on the current element type and/or the setting of the element shape key [MSHAPE].
5、If your goal is a mapped triangle mesh, you can also specify the pattern ANSYS uses to create the mesh of triangular elements [MSHPATTERN]. If you do not specify a pattern, ANSYS chooses one for you. See the MSHPATTERN command description in the ANSYS Commands Reference for an illustration of the available patterns.
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