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Holes in cylinder AMI snappy 2.3.0

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Old   February 27, 2014, 13:45
Default Holes in cylinder AMI snappy 2.3.0
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Pete Bachant
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I am having trouble creating a valid AMI surface from a cylindrical STL with the newest snappyHexMesh. I am using similar settings that have worked in 2.2.2, but with some modifications to mimic the 2.3.0 version of the propeller tutorial (which I think is basically that the AMI is created using createPatch, instead of topoSet). Anyway, I am getting "holes" in the AMI surface that are hard to avoid. I have even tried recreating the dict from scratch using the generic snappyHexMeshDict included with 2.3.0, but still have problems with removing faces (or just never creating them) on the cylinder.



Note I am running snappy in parallel on 6 processes. Any tips for getting rid of these holes?

Last edited by pbachant; March 1, 2014 at 14:40.
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Old   March 14, 2014, 10:07
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Hi,

how does your initial background mesh look like? Have you tried to increase the bounding box just a little bit in each coordinate direction?

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Old   March 14, 2014, 14:03
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Pete Bachant
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Quote:
Originally Posted by cutter View Post
Hi,

how does your initial background mesh look like? Have you tried to increase the bounding box just a little bit in each coordinate direction?

Cutter
My background mesh is a simple rectangle built out of cubes. I have only been playing around with the number of cells in the blockMesh, not the size. Why do you recommend stretching the size?
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Old   March 14, 2014, 23:37
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Pete Bachant
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Seems I have found a way around this problem. Luckily, I was free to change the length of the cylinder to make it 3/4 the height of the blockMesh, then cut the blockMesh in the z-direction such that some existing cells would be coincident with the end faces of the cylinder.
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