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Thank you Matt for the useful info. I’ll try your idea.
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<div>Miguel</div>
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<div>On 15 Jan 2025, at 16:48, Matthew Knepley <knepley@gmail.com> wrote:</div>
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<div dir="ltr">On Wed, Jan 15, 2025 at 10:41 AM MIGUEL MOLINOS PEREZ <<a href="mailto:mmolinos@us.es">mmolinos@us.es</a>> wrote:</div>
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<div>Thank you Matt.</div>
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<div>Yes, I am getting the "CellDM" from the DMSwarm.</div>
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<div>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.</div>
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<div>Nice to hear that. Should I move to main?</div>
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<div>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.</div>
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<div>2. I assume you are using release</div>
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<div>You are correct. </div>
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<div>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).</div>
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<div>What do you mean by rebin?</div>
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<div>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.</div>
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<div> Thanks,</div>
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<div> Matt</div>
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<div>Miguel</div>
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<div> Thanks,</div>
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<div> Matt</div>
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Best,<br>
Miguel<br>
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<div>What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.<br>
-- Norbert Wiener</div>
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<div><a href="https://urldefense.us/v3/__http://www.cse.buffalo.edu/*knepley/__;fg!!G_uCfscf7eWS!ftMLihgZiKVFAR-BRnPC50J7_Albtps8mwCGwL9BAp2zqgrP8u4UmHO3nzVtXrHq-OZuegO2vaFRFL0E5YN5Yg$" target="_blank">https://www.cse.buffalo.edu/~knepley/</a><br>
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<div>What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.<br>
-- Norbert Wiener</div>
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<div><a href="https://urldefense.us/v3/__http://www.cse.buffalo.edu/*knepley/__;fg!!G_uCfscf7eWS!ftMLihgZiKVFAR-BRnPC50J7_Albtps8mwCGwL9BAp2zqgrP8u4UmHO3nzVtXrHq-OZuegO2vaFRFL0E5YN5Yg$" target="_blank">https://www.cse.buffalo.edu/~knepley/</a></div>
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