[johannes.tophoj]

Hi

I wish to simulate the flow over some structure. I have a mesh that works well with the wind approaching from one direction and I get a satisfactory steady solution. I use blockMesh and snappyHexMesh

Instead of generating new meshes for each alternative wind direction I would like to just rotate the central part of the mesh and make new cases from these meshes. This feature seems quite obvious to me but I have not yet determined how to do it. Note that I don't want a dynamic mesh. I just want to divide the mesh and rotate part of it. I attach a couple of sketches of what I am trying to do.

I have looked at the propeller and annularThermalMixer cases, even though the simulations are quite different from my needs, but it is hard for me to understand all the steps of the mesh generation.

What I imagine I should do is to split the mesh in two parts: a cylindrical part in the middle and the remaining part. I have managed to create a cylindrical zell cone with snappyHexMesh but now I feel I'm shooting in the dark with various meshing utilities. I don't understand the difference between sets, zones, regions and that makes it difficult for me to see a way through. And once split, I want to rotate the cylindrical part and merge the meshes to one or better, use AMI to connect them.

So my question is: Can anyone point me to some documentation on the data types (sets,zones,regions,...) or a tutorial that makes it possible to understand the necessary concepts in clear steps?