[petsc-users] Update DMDA attached to DMSWARM

[MIGUEL MOLINOS PEREZ]

Thank you Matt for the useful info. I’ll try your idea.

Miguel

On 15 Jan 2025, at 16:48, Matthew Knepley <knepley at gmail.com> wrote:

On Wed, Jan 15, 2025 at 10:41 AM MIGUEL MOLINOS PEREZ <mmolinos at us.es<mailto:mmolinos at us.es>> wrote:
Thank you Matt.

Yes, I am getting the "CellDM" from the DMSwarm.

1. I have recently overhauled this functionality because it was not flexible enough for the plasma simulation we do. Thus main and release work differently.

Nice to hear that. Should I move to main?

The changes allow you to have several cell DMs. I want to bin particles in space, but also in velocity, and then in the tensor product of space and velocity. Moreover, sometimes I want to use different Swarm fields as the DM field for the solver. You can do all that with main now. If you just need a single DM with the same DM fields, release is fine.

2. I assume you are using release

You are correct.

3. In both main and release, if you change the coordinates of your CellDM mesh, you need to rebin the particles. The easiest way to do this is to call DMSwarmMigrate(sw, PETSC_FALSE).

What do you mean by rebin?

When you provide the cell DM, Swrm makes a "sort context" that bins the particles into DM cells. If you change the coordinates, this binning will change, so you need it to "rebin" or recreate the sort context.

  Thanks,

    Matt

Miguel


  Thanks,

     Matt

Best,
Miguel
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--
What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.
-- Norbert Wiener

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