setting up a free surface simulation using stl based domain

Dear all,

I would like to build a free surface simulation of a natural area.
I produced an STL file which describe the geometry of the domain.
For the free surface aspect, I try to follow the damBreak3d example and for the STL aspect, I follow the aneurysm example.
I try to make a mix of both examples, but enter in some difficulties as, in particular for the aneurysm example, there is also grid refinement aspect present in the code.
So I wonder if someone can indicate me an example closer to my simulation.