CSG Geometry problem

[newbyJulia]

Hello everybody,

i have a short question about CSG geometries.
I was trying to build my domain via a polygon, but unfortunately if i am marking my boundaries, i can’t handle my condition, zero flux, on only one boundary.

Now i trying to build the domain via GSG geometries. There a several geometries like unit circle or rectangle. But is there also a geometry from a triangle? I can’t find it on the internet. Sorry ;).

Greetings

[dokken]

Please construct a minimal example as described in:

Read before posting: How do I get my question answered?

Here are a few tips to help get your question answered: Phrase the title of your post as a question and make it meaningful. Check that your question hasn’t been asked before using the search functionality. Post a “minimum working code example” (MWE) to illustrate the problem: A MWE is the simplest piece of code that reproduces or explains the problem you have. It must be possible to take the MWE, paste it into a file and run it, without any extra modifications. Good MWEs can be as little as …

One of the things that you should add to your question is the code that cannot handle the condition, as well as a reference to a simple CSG geometry and the software required to generate a mesh from it.