In one spatial dimension one can choose between
-
Eulerian grid: fixed in space
-
Lagrangian grid: moving with the flow (makes the linear 1D advection trivial)
- Hybrid grid: moving with another speed
- No ``grid'': SPH (grid is replaced by particle positions)
In multi-dimensions things become more complicated.
In the following examples the grid points will be fixed (Eulerian) and equidistant.