These are chat archives for **Fortran-FOSS-Programmers/General-Discussion**

Yes transforming uses Jacobian. So you're using multi-grid? Or chimera/overset grids?

@zbeekman Giacomo used a kinda of *multi-grid* (non dynamic/adaptive grid refinement), I am using dynamic overlapping grid (Chimera) with also multi-grid acceleration, but the point is that we want to have:

- multi-grid residual acceleration;
- AMR (dynamic/adaptive mesh refinement);
- dynamic overlapping grids (Chimera with moving bodies);
- initially based on structured (body fitted) blocks but at same point we want:
- mix also unstructured blocks (to easy mesh region of
*low interest*); - mix also immersed boundaries;
- track sharp interface between:
- same fluid with different
*state*or*phase*; - different fluids:

- same fluid with different

- mix also unstructured blocks (to easy mesh region of

One crucial point (among others) is doing interpolation with very different *solutions* computed on the some region.

@zbeekman And how you evaluate Jacobian elements? I refer to the derivatives of the physical coordinates respect to computational coordinates, or vice-versa.