Volume Shrink Wrap Meshing
Produce an all-hexa or all-tetra mesh based on the selected elements or geometry, then use the shrink wrap functionality as a quick mechanism to generate solid meshes.
Note: When generating such a mesh, the Jacobian value has a large effect on the
coarseness of the resulting volume mesh, as described below.
Using the shrink
wrap mesh to achieve improved FE output from OptiStruct
topology runs has also provided very good results which allow for quick tetra-meshing
and, therefore, quick re-analysis after the optimization run.Comparison of Altering the Jacobian Value for Solid Mesh Generation
Within both tight and loose wrap algorithm’s there is an option to generate solid
mesh. This will generate an all hexa mesh on completion of the shrink wrap. When the
generate solid mesh checkbox is selected it will expose a
minimum jacobian input, this option essentially will hexa mesh the part with this
element quality criteria defined, it controls the hexa quality which is directly
linked to the adherence to the topological features of the original component. The
jacobian value must be between 0 and 1. The nearer the value is to 1 the cruder the
output will appear, the mesh will be more heavily voxelised. When the value is
closer to 0, you are allowing the shrink wrap solid mesh algorithm to smooth and
adhere to more features while maintaining the solid mesh minimum jacobian element
quality. By default the minimum jacobian value is 0.3.
 Figure 1. 2mm Solid Mesh, Jacobian=1.0 |
 Figure 2. 2mm Solid Mesh, Jacobian=0.3 |