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The disadvantage of the Hex Dominant meshing technique is that it generates poor elements in transition regions between hex and tet elements. A pure hex mesh can be generated by splitting up the model and using the Multizone meshing technique as per the video below. The video considers only one parts. You need to divide the parts as per the image below to get a pure hex mesh.
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<iframe width="560" height="315" src="https://www.youtube.com/embed/AJFHvoKNy2c?rel=0" frameborder="0" allowfullscreen></iframe> |
The video considers hex meshing for one part only. It turns out you need to divide the parts as per the image below to get a pure hex mesh for all parts. Note that the mesh quality improves if you make two of the splits perpendicular to certain faces as indicated in the image.
Check that you have a pure hex mesh by turning on element quality. The Hex20 label refers to hex elements with 20 nodes per element including midside nodes.
