Tools to split one boundary into two

[pj131611]

Hi there,

While using "Thermal Contact" for mutually contacting geometry, we need to find a way to turn the interface or intersection between two geometry into two different boundaries. But I'm stuck on how to do so while the two contacting objects are in different size, let's say, a cube with length of 1 and a cube with length 2. Do I have to cut the larger cube in this case?

Any help will be much appreciated!

[GiudGiud]

Hello

The contact interfaces do not have to match.
If your geometries are cubes, the sidesets-generators in moose (under MeshGenerator) should easily add the new sidesets
(bottom of https://mooseframework.inl.gov/syntax/Mesh/index.html)

If your mesh started out with the two cubes merged together, you can use the BreakMeshByBlockGenerator to split them
https://mooseframework.inl.gov/source/meshgenerators/BreakMeshByBlockGenerator.html
Guillaume

[pj131611]

Cutting a large boundary into multiple parts.

[GiudGiud]

can you use the ParsedGenerateSideset with include_boundaries to do that?

[pj131611]

I always run into error while using Parsed related functions, but I manage to split the interface with SideSetsAroundSubdomainGenerator by setting different normal vectors (benefit of cubes :D), but I noticed that some of the side side doesn't have a corresponding node set and the name of side set and node set doesn't agree either, did I missed anything?

[GiudGiud]

If there is a missing nodeset you can use an option in the Mesh block to convert the sidesets to nodeset s

There is also a generator for this conversion

SidesetsToNodesetsGenerator iirc

[pj131611]

That's Wonderful. Thanks again for all your help!