Document idea of fieldaligned coordinate system
Document idea of fieldaligned coordinate system

for the discretization of parallel finite volume schemes
- another idea is to compute the entire thing on a refined grid
and only in the end project back to the original grid
- requires separation of communication and perp interpolation
- requires fine interpolation matrices, volume and vector

mwiesenberger/feltor,mwiesenberger/feltor,feltor-dev/feltor,mwiesenberger/feltor,feltor-dev/feltor,feltor-dev/feltor,mwiesenberger/feltor,feltor-dev/feltor