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How to deal with cad-geometry

In general hexahedra-elements perform better than tets but if the mesh should be derived from a cad-geometry it is often more convenient to create a tetrahedra mesh as to modify or rebuild the geometry to make it meshable with hexahedra-elements. The following section gives some hints which alternatives are available.

The following section describes the process to generate a tet-mesh with cgx based on a cad model:

Figure 13: CAD-geometry meshed with tet-elements
\begin{figure}\epsfig{file=halter.eps,width=9cm}\end{figure}

For cyclic symmetric boundary conditions it is preferable to have the same mesh on both connected surfaces. To archive this the user should not mesh one of this sides. Instead he copies the elements of the meshed side to the location of the un-meshed side (see ''copy''). Then he flips the orientation of this elements (see ''flip'') and merges the nodes in that region (usually just ''merg n all''). Now the tet mesh can be generated.


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Next: How to check an Up: Tips and Hints Previous: How to process results   Contents
root 2019-11-22