[marango]

Hi everybody,

I'm currently working on a complex geometry with multiple regions. Therefore I decided to use snappyHexMesh to create a mesh of my geometry. Since my results are not useful, I do have some questions about working with sHM. Perhaps somebody can help me, finding the answers.

(1) In my geometry I have two regions that consists of different materials. One region is a pipe with a wall thickness of 2mm and the other one is a cylinder that perfectly fits in that pipe, so that there's no space in between. My question is how sHM works with these two regions. Does it create the mesh for each region one after the other and finally puts them together OR does it uses the regions "in parallel" while creating the mesh?

(2) I tried to to create a mesh for each region and manually merge them with mergeMeshRegions. Since sHM cannot exactly resolve the curvature of the pipe and cylinder, it creates some space between these two parts (see picture below). Does anyone can give me some advice to make them perfectly fit?

(3) In snappyHexMeshDict I have to define an inside point. Do I have to choose a special point or is it indifferent in which region this point lies?

(4) When I use multiple regions with sHM, it doesn't remove the outer cells I don't need. Is there a way to remove them manually?

Many thanks in advance!

Marango