Meshing Tiny Thermal Vias

Hi everyone,

By using the Joule Heating Modul, I am trying to get the max. temperature around an electronic component. I have studied similar models before; but this time addionally placed several tiny (in radial direction) and long thermal vias across the PCB.

You can imagine those as really narrow and relatively long cylindrical tunnels connecting both sides of the PCB.

I figured that the "build all" takes forever and meshing gives memory errors. Even if I use an extra coarse mesh the simulation seems like it would take ages.

What would be an ideal (meshing or some other type of) approach to those structures?

Thanks,
Bartu