Dual Grid Approach

[lwJi]

How can I turn this mode on when I evolve both mesh data and particle data?
https://amrex-codes.github.io/amrex/docs_html/DualGrid.html

[atmyers]

Hi @lwJi,

It isn't as simple as turning a switch, unfortunately. Basically, you need to use the ParticleContainer regrid methods to set the particle grids to what you want. Then, when doing particle-mesh interpolation, you need to do an extra copy if the particles and mesh are on different grids, as here.

[lwJi]

Thanks @atmyers
Just to make sure I understand correctly: I need to construct the dmap myself so that it's separate from the one used for the mesh data, right?

Also, do you know of any application codes that implement this approach so I could take a look at a working example?

[atmyers]

That's right, although there are routines in AMReX that can help you build the dmap given the appropriate cost vectors. I believe that if you search for "dual_grid" in this repository you can see an example of this in action.

[lwJi]

Thanks @atmyers . I really appreciate it