<div><br></div><div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Le ven. 7 janv. 2022 à 19:23, Matthew Knepley <<a href="mailto:knepley@gmail.com">knepley@gmail.com</a>> a écrit :<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;padding-left:1ex;border-left-color:rgb(204,204,204)"><div dir="ltr"></div><div dir="ltr"><div dir="ltr">On Fri, Jan 7, 2022 at 12:58 PM Thibault Bridel-Bertomeu <<a href="mailto:thibault.bridelbertomeu@gmail.com" target="_blank">thibault.bridelbertomeu@gmail.com</a>> wrote:<br></div></div><div dir="ltr"><div class="gmail_quote"></div></div><div dir="ltr"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;padding-left:1ex;border-left-color:rgb(204,204,204)"><div><br></div><div><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Le ven. 7 janv. 2022 à 14:54, Matthew Knepley <<a href="mailto:knepley@gmail.com" target="_blank">knepley@gmail.com</a>> a écrit :<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;padding-left:1ex;border-left-color:rgb(204,204,204)"><div dir="ltr"><div dir="ltr">On Fri, Jan 7, 2022 at 8:52 AM Thibault Bridel-Bertomeu <<a href="mailto:thibault.bridelbertomeu@gmail.com" target="_blank">thibault.bridelbertomeu@gmail.com</a>> wrote:<br></div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;padding-left:1ex;border-left-color:rgb(204,204,204)"><div dir="auto">Hi Matthew,</div><div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Le ven. 7 janv. 2022 à 14:44, Matthew Knepley <<a href="mailto:knepley@gmail.com" target="_blank">knepley@gmail.com</a>> a écrit :<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;padding-left:1ex;border-left-color:rgb(204,204,204)"><div dir="ltr"><div dir="ltr">On Fri, Jan 7, 2022 at 5:46 AM Thibault Bridel-Bertomeu <<a href="mailto:thibault.bridelbertomeu@gmail.com" target="_blank">thibault.bridelbertomeu@gmail.com</a>> wrote:<br></div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;padding-left:1ex;border-left-color:rgb(204,204,204)"><div dir="ltr"><div>Dear all,</div><div><br></div><div>First of, happy new year everyone !! All the best !</div></div></blockquote><div><br></div><div>Happy New Year!</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;padding-left:1ex;border-left-color:rgb(204,204,204)"><div dir="ltr"><div>I am starting to draft a new project that will be about fluid-structure interaction: in particular, the idea is to compute the Navier-Stokes (or Euler nevermind) flow around an object and _at the same time_ compute the heat equation inside the object.</div><div>So basically, I am thinking a mesh of the fluid and a mesh of the object, both meshes being linked at the fluid - solid interface.</div></div></blockquote><div><br></div><div>First question: Are these meshes intended to match on the interface? If not, this sounds like overset grids or immersed boundary/interface methods. In this case, more than one mesh makes sense to me. If they are intended to match, then I would advocate a single mesh with multiple problems defined on it. I have experimented with this, for example see SNES ex23 where I have a field in only part of the domain. I have a large project to do exactly this in a rocket engine now.</div></div></div></blockquote><div dir="auto"><br></div><div dir="auto">Yes the way I see it is more of a single mesh with two distinct regions to distinguish between the fluid and the solid. I was talking about two meshes to try and explain my vision but it seems like it was unclear. </div><div dir="auto">Imagine if you wish a rectangular box with a sphere inclusion: the sphere would be tagged as a solid and the rest of the domain as fluid. Using Gmsh volumes for instance. </div><div dir="auto">Ill check out the SNES example ! Thanks !</div><div dir="auto"><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;padding-left:1ex;border-left-color:rgb(204,204,204)"><div dir="ltr"><div class="gmail_quote"><div dir="auto"></div></div></div></blockquote><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;padding-left:1ex;border-left-color:rgb(204,204,204)"><div dir="ltr"><div class="gmail_quote"><div dir="auto"></div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;padding-left:1ex;border-left-color:rgb(204,204,204)"><div dir="ltr"><div>First (Matthew maybe ?) do you think it is something that could be done using two DMPlex's that would somehow be spawned from reading a Gmsh mesh with two volumes ?</div></div></blockquote><div><br></div><div>You can take a mesh and filter out part of it with DMPlexFilter(). That is not used much so I may have to fix it to do what you want, but that should be easy.</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;padding-left:1ex;border-left-color:rgb(204,204,204)"><div dir="ltr"><div> And on one DMPlex we would have finite volume for the fluid, on the other finite elements for the heat eqn ?</div></div></blockquote><div><br></div><div>I have done this exact thing on a single mesh. It should be no harder on two meshes if you go that route.</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;padding-left:1ex;border-left-color:rgb(204,204,204)"><div dir="ltr"><div>Second, is it something that anyone in the community has ever imagined doing with PETSc DMPlex's ?</div></div></blockquote><div><br></div><div>Yes, I had a combined FV+FEM simulation of magma dynamics (I should make it an example), and currently we are doing FVM+FEM for simulation of a rocket engine.</div></div></div></blockquote><div dir="auto"><br></div><div dir="auto">Wow so it seems like it’s the exact same thing I would like to achieve as the rocket engine example. </div><div dir="auto">So you have a single mesh and two regions tagged differently, and you use the DmPlexFilter to solve FVM and FEM separately ?</div></div></div></blockquote><div><br></div><div>With a single mesh, you do not even need DMPlexFilter. You just use the labels that Gmsh gives you. I think we should be able to get it going in a straightforward way.</div></div></div></blockquote><div dir="auto"><br></div><div dir="auto">Ok then ! Thanks ! I’ll give it a shot and see what happens ! </div><div dir="auto">Setting up the FVM and FEM discretizations will pass by DMSetField right ? With a single mesh tagged with two different regions, it should show up as two fields, is that correct ? </div></div></div></blockquote><div><br></div></div></div><div dir="ltr"><div class="gmail_quote"><div>Yes, the idea is as follows. Each field also has a label argument that is the support of the field in the domain. Then we create PetscDS objects for each</div><div>separate set of overlapping fields. The current algorithm is not complete I think, so let me know if this step fails.</div></div></div></blockquote><div dir="auto"><br></div><div dir="auto">Ok, thanks. </div><div dir="auto">I’ll let you know and share snippets when I have something started !</div><div dir="auto"><br></div><div dir="auto">Talk soon ! Thanks !</div><div dir="auto"><br></div><div dir="auto">Thibault</div><div dir="auto"><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;padding-left:1ex;border-left-color:rgb(204,204,204)"><div dir="ltr"><div class="gmail_quote"><div dir="auto"></div><div><br></div><div> Thanks,</div><div><br></div><div> Matt</div></div></div><div dir="ltr"><div class="gmail_quote"><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;padding-left:1ex;border-left-color:rgb(204,204,204)"><div><div class="gmail_quote"><div dir="auto">Thanks,</div><div dir="auto"><br></div><div dir="auto">Thibault</div><div dir="auto"><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;padding-left:1ex;border-left-color:rgb(204,204,204)"><div dir="ltr"><div class="gmail_quote"><div dir="auto"></div><div><br></div><div> Thanks,</div><div><br></div><div> Matt</div></div></div><div dir="ltr"><div class="gmail_quote"><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;padding-left:1ex;border-left-color:rgb(204,204,204)"><div><div class="gmail_quote"><div dir="auto">Thanks ! </div><div dir="auto"><br></div><div dir="auto">Thibault</div><div dir="auto"><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;padding-left:1ex;border-left-color:rgb(204,204,204)"><div dir="ltr"><div class="gmail_quote"><div dir="auto"></div><div><br></div><div> Thanks,</div><div><br></div><div> Matt</div></div></div><div dir="ltr"><div class="gmail_quote"><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;padding-left:1ex;border-left-color:rgb(204,204,204)"><div dir="ltr"><div>As I said it is very prospective, I just wanted to have your opinion !!</div><div><br></div><div>Thanks very much in advance everyone !!</div><div><br></div><div>Cheers, <br></div><div>Thibault<br></div><div><br></div></div>
</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><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><div><br></div><div><a href="http://www.cse.buffalo.edu/~knepley/" target="_blank">https://www.cse.buffalo.edu/~knepley/</a><br></div></div></div></div></div></div></div></div>
</blockquote></div></div>-- <br><div dir="ltr"><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div><div><div><div><div>Thibault Bridel-Bertomeu<br>—<br></div></div></div></div>Eng, MSc, PhD</div><div>Research Engineer</div><div>CEA/CESTA</div><div>33114 LE BARP</div><div>Tel.: (+33)557046924</div><div>Mob.: (+33)611025322<br></div><div>Mail: <a href="mailto:thibault.bridelbertomeu@gmail.com" target="_blank">thibault.bridelbertomeu@gmail.com</a><br></div></div></div></div></div></div>
</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><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><div><br></div><div><a href="http://www.cse.buffalo.edu/~knepley/" target="_blank">https://www.cse.buffalo.edu/~knepley/</a><br></div></div></div></div></div></div></div></div>
</blockquote></div></div>-- <br><div dir="ltr"><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div><div><div><div><div>Thibault Bridel-Bertomeu<br>—<br></div></div></div></div>Eng, MSc, PhD</div><div>Research Engineer</div><div>CEA/CESTA</div><div>33114 LE BARP</div><div>Tel.: (+33)557046924</div><div>Mob.: (+33)611025322<br></div><div>Mail: <a href="mailto:thibault.bridelbertomeu@gmail.com" target="_blank">thibault.bridelbertomeu@gmail.com</a><br></div></div></div></div></div></div>
</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><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><div><br></div><div><a href="http://www.cse.buffalo.edu/~knepley/" target="_blank">https://www.cse.buffalo.edu/~knepley/</a><br></div></div></div></div></div></div></div></div>
</blockquote></div></div>-- <br><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div><div><div><div><div>Thibault Bridel-Bertomeu<br>—<br></div></div></div></div>Eng, MSc, PhD</div><div>Research Engineer</div><div>CEA/CESTA</div><div>33114 LE BARP</div><div>Tel.: (+33)557046924</div><div>Mob.: (+33)611025322<br></div><div>Mail: <a href="mailto:thibault.bridelbertomeu@gmail.com" target="_blank">thibault.bridelbertomeu@gmail.com</a><br></div></div></div></div></div></div>