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[ICEM] Mixed Grids

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Old   July 24, 2014, 08:27
Default Mixed Grids
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I am trying to create a hybrid structured/unstructured mesh around a helicopter rotor. I want a stuctured grid around 1 chord of the blade and then unstructured. Because hexa meshes are of good quality i started by blocking my topology and making a structured mesh.
As you can see from the pics I have created surfases "hugging" the blades.Inside those surfaces I want the structured grid.Everywhere else unstructured.

In 2d making unstructured blocks was quite easy.However in 3D things get more complicated.

My problem is that I have around 250 blocks.It is very difficult to set up each face explicitly and even if I do that (with blocking index control) the result is poor quality mesh everywhere.

Is it possible to extract the portions of the structured grid I want (the 2 hugging surfaces) and then do a tetra/mixed flood fill in the rest of the space?

I have tried using the surface meshes of the blade and the hugging surface and then generate an octree mesh but all i get is a segmentation fault. Octree meshing the whole geometry results in a poor quality geometrical representation of the blade(How can you fill the surface with high ratio triangles instead of the classic ones)

What is the strategy one should follow for creating unstructured grids in 3d?

Any ideas would be really helpful.

Attached Images
File Type: jpg blocks.jpg (84.9 KB, 15 views)
File Type: jpg meshc2.jpg (97.2 KB, 15 views)
File Type: jpg meshc.jpg (94.5 KB, 15 views)
File Type: jpg blades.jpg (24.2 KB, 13 views)
File Type: jpg cgrid.jpg (25.6 KB, 12 views)
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