How do you add boundaries to a complicated structure in GMSH. Prior to importing it to Fenics.
For my particular project I need to create over a 100 tubes, and be able to model and calculate the external flow as well as the internal flow of the tubes with a penetrable membrane.
The tubes would be stacked in a configuration similar to a radiator on a car.
Right now I have a single tube modeled and then in Solidworks I put them in the configuration I want then export the model to Gmsh. But can’t figure out how to do boundaries on each one. (would prefer to use cylindrical coordinate system if possible)