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Thank you Matt, I will definitely do that. Thrilled to add a humble contribution to PETSc :-) Best, Miguel On 21 Apr 2024, at 16: 01, Matthew Knepley <knepley@ gmail. com> wrote: On Sun, Apr 21, 2024 at 9: 38 AM MIGUEL MOLINOS PEREZ <mmolinos@ us. es>
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<div>Thank you Matt, I will definitely do that. Thrilled to add a humble contribution to PETSc :-)
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<div>Miguel<br id="lineBreakAtBeginningOfMessage">
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<div>On 21 Apr 2024, at 16:01, Matthew Knepley <knepley@gmail.com> wrote:</div>
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<div dir="ltr">On Sun, Apr 21, 2024 at 9:38 AM MIGUEL MOLINOS PEREZ <<a href="mailto:mmolinos@us.es">mmolinos@us.es</a>> wrote:<br>
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<div>Dear Matt,
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<div>Thank you for your answer. In addition to your suggestion I solved a bug in the test (I was not updating the local size integer during the time loop). Indeed if I turn off periodicity it works. Furthermore, if I use instead DM_BOUNDARY_TWIST instead, it
works too.</div>
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<div>However, if I turn on DM_BOUNDARY_PERIODIC, I got an error in the search algorithm I implemented for the domain decomposition inspired by (<a href="https://urldefense.us/v3/__https://petsc.org/main/src/dm/tutorials/swarm_ex3.c.html__;!!G_uCfscf7eWS!djMj0jtH27HHR56cKhjzc0Kd4_HcjA62WBT1w_w1KFs0TfJQOtFQLA2AexxL7g4rS8aelbmYYFAE9n3wQLSIBA$" target="_blank">https://petsc.org/main/src/dm/tutorials/swarm_ex3.c.html</a>).
The algorithm is not capable of finding some of the particles at the initial stage of the simulation (without transport).</div>
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<div>Looks like the error is on my end, however it is puzzling why it works for DM_BOUNDARY_TWIST but not for DM_BOUNDARY_PERIODIC. </div>
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<div>I usually solve these things by making a simple example. We could make another test in Swarm test ex1 that uses periodicity. If you send a draft over that fails, I can help you debug it. It would make a fantastic contribution to PETSc.</div>
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<div> Thanks,</div>
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<div> Matt</div>
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<div>Thanks,</div>
<div>Miguel<br id="m_190239834841406916lineBreakAtBeginningOfMessage">
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<div>On 21 Apr 2024, at 14:53, Matthew Knepley <<a href="mailto:knepley@gmail.com" target="_blank">knepley@gmail.com</a>> wrote:</div>
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<div dir="ltr">On Thu, Apr 18, 2024 at 8:23 AM MIGUEL MOLINOS PEREZ <<a href="mailto:mmolinos@us.es" target="_blank">mmolinos@us.es</a>> wrote:<br>
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Dear all, I am working on the implementation of periodic bcc using a discretisation (PIC-style). I am working with a test case which consists on solving the advection of a set of particles inside of a box (DMDA mesh) with periodic bcc on
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<div dir="ltr">Dear all,</div>
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<div dir="ltr">I am working on the implementation of periodic bcc using a discretisation (PIC-style). I am working with a test case which consists on solving the advection of a set of particles inside of a box (DMDA mesh) with periodic bcc on the x axis. </div>
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<div dir="ltr">My implementation updates the position of each particle with a velocity field, afterwards I check if the particle is inside, or not, the supercell (periodic box). If not, I correct the position using bcc conditions. Once this step is done, I
call Dmswarmmigrate.</div>
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<div dir="ltr">It works in serial, but crashes in parallel with MPI (see attached nohup file).<span> I have checked some of the </span><span>Dmswarmmigrate examples, and they looks similar to my implementation. However they do not use periodic bcc. </span></div>
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<div dir="ltr">I am missing any step in addition to <span>Dmswarmmigrate?</span></div>
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<div>It does not sound like it. We do have parallel examples of periodic migration, such as Swarm ex9.</div>
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<div>What happens if you turn off periodicity and just let particles fall out of the box? Does it still crash?</div>
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<div> Thanks,</div>
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<div> Matt</div>
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<div>Best regards</div>
<div>Miguel</div>
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<div><a href="https://urldefense.us/v3/__http://www.cse.buffalo.edu/*knepley/__;fg!!G_uCfscf7eWS!djMj0jtH27HHR56cKhjzc0Kd4_HcjA62WBT1w_w1KFs0TfJQOtFQLA2AexxL7g4rS8aelbmYYFAE9n05B_V0QA$" target="_blank">https://www.cse.buffalo.edu/~knepley/</a><br>
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