[RobertHB]

Hello everyone,
i need to generate a mesh of a long cylinder or tube where the outer hull is divided into three single patches. The goal is to get the faceSet of all outer faces of the middle patch to use in a fvOptions source. See the image below.
So far i have tried using snappyHexMesh, but snappyHexMesh usually creates one outer patch (if its the whole cylinder) or only the part of the cylinder where the pointInMesh is, when i subdivide my stl-file.
I came accross a thread where it is suggested to use splitRegionMesh with the subdiveded stl-file to create different cellZones. That works, yes, but i dont get patches, but cellZones, and the results of my simulation is incorrect.

Does someone know how to solve this problem?

-Robert

[simrego]

Hi!


If you are using snappyHexMesh, save the different patches of the pipe into different stl files, and you can generate the mesh with different patches.
Or if you have the same boundary conditions for every parts, you can select the faces for the different parts with topoSet. First select all faces for example in a box (boxToFace) which contains the part of the region you need, and then use subset for the boundary patches. Then in the faceSet you will have all the boundary faces in the given region.

[RobertHB]

Originally Posted by simrego

If you are using snappyHexMesh, save the different patches of the pipe into different stl files, and you can generate the mesh with different patches.
Or if you have the same boundary conditions for every parts, you can select the faces for the different parts with topoSet. First select all faces for example in a box (boxToFace) which contains the part of the region you need, and then use subset for the boundary patches. Then in the faceSet you will have all the boundary faces in the given region.

Hi simrego,
thanks for the advice, that is exaclty what i ended up doing.