Hi @kelrocha, for future reference:
A format like this allows us to see your project without auto copying it in our dashboard. I can see right off the bat that the first issue you will have is that the solids are penetrating each other. You need to make Boolean operations (substractions) so that there’s only one body in a given space.
After that, I think you have the right approach regarding the mesh type but you have to personalize it a little better. When you click on “Operation 1” you will see properties, the number of cells needs to be increased and probably like that there are other things that need to be personalized. A trick that does this for you and I learned recently from @sjesu_rajendra is to select the geometry “Igreja…” in the geometries tab and then you should see on the top, next to “geometry” a button that says make new mesh. If you create your mesh this way, when you select hexahedra parametric and click save it should automatically fill stuff based on your geometry. After that make sure that your material point is occupying the volume of air and not any solid.
Good luck, this church looks pretty cool: love the names in Portuguese!