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Help needed to generate a graded pipe mesh.

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Old   August 22, 2009, 08:58
Default Help needed to generate a graded pipe mesh.
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Jim Enright
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I'm trying to generate a 'doughnut' pipe mesh with different levels of refinement at different parts of the pipe using blockMesh.
I want the mesh to be fine in the middle of the pipe and coarse at the inlet and outlet sides.

I create the pipe mesh using a script that allows me to specify the outer and inner radius of the pipe (attached).

I've used the refineHexMesh utility on cells within a bounding box near the centre of the pipe. I also tried snappyHexMesh to refine the region inside a searchable box.
However, both of these seemed to refine in only one direction and the edges from the refined region didn't connect well with the non-refined region. I hope you can see this in the attached screenshot.

Does anyone have any suggestions?
Is it possible to modify my script to get refinement in a specific part of the pipe?

Attached Images
File Type: jpg pipeMesh_refineHexMesh.jpg (59.3 KB, 89 views)
Attached Files
File Type: gz doughnutPipeMesh.m4.gz (1.4 KB, 23 views)
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blockmesh, mesh quality, refinement

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