Holes in cylinder AMI snappy 2.3.0
 

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.

https://lh6.googleusercontent.com/-O...no/Capture.PNG

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

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?

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.