I am trying to solve a slope stability problem with ff3d.
The surface of space is not flat, but with a slope, such as 10 degree.
How to define the problem space in FEM? and how to identify the upper surface?
I know there are two methods implemented in ff3d, one is FEM, another one is FDM.
FEM can only run on regular hexahedral mesh defined by vector a, b, and n, is it right(here, FEM used only mesh)?
However, FDM can run on other irregular domain with the help of pov ray,
but the domain must be contained in the Mesh completely, is it true(here, FDM used doamin and mesh)?