<div dir="ltr"><div dir="ltr">On Tue, Nov 9, 2021 at 9:54 AM Bhargav Subramanya <<a href="mailto:bhargav.subramanya@kaust.edu.sa">bhargav.subramanya@kaust.edu.sa</a>> wrote:<br></div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Dear All,<div><br></div><div>I want to generate a prismatic mesh from a base spherical surface mesh. I first refine the base icosahedron sequential mesh to some extent, distribute the mesh, continue the refinement in parallel, project the mesh to a unit sphere, and then finally extrude the mesh. The following is the code I am using. As the extrusion is performed in parallel, the extruded mesh seems to be broken as shown in the attached figure. May I know how to get an intact extruded mesh in parallel? Also, is it possible to make mesh refinement respect the spherical surface geometry, without having to project it using a function as shown below?</div></div></blockquote><div><br></div><div>I think you can do most of what you want from the command line. Here is a simple code:</div><div><br></div><div>#include <petsc.h><br><br>int main(int argc, char **argv)<br>{<br> DM dm;<br> PetscErrorCode ierr;<br><br> ierr = PetscInitialize(&argc, &argv, NULL, NULL);if (ierr) return ierr;<br> ierr = DMCreate(PETSC_COMM_WORLD, &dm);CHKERRQ(ierr);<br> ierr = DMSetType(dm, DMPLEX);CHKERRQ(ierr);<br> ierr = DMSetFromOptions(dm);CHKERRQ(ierr);<br> ierr = DMViewFromOptions(dm, NULL, "-dm_view");CHKERRQ(ierr);<br> ierr = DMDestroy(&dm);CHKERRQ(ierr);<br> ierr = PetscFinalize();<br> return ierr;<br>}<br></div><div><br></div><div>that I run using</div><div><br></div><div> mpiexec -n 2 ./meshtest -dm_plex_shape sphere -dm_refine_pre 3 -dm_extrude 5 -dm_plex_transform_extrude_thickness 0.1 -dm_distribute -dm_view hdf5:mesh.h5</div><div><br></div><div>and get the attached picture. I am refining before distribution only here, since the after distribution refinement would refine the extrude thing, which is not what you want.</div><div>If you want refinement after distribution, you could use this code to do</div><div><br></div><div> mpiexec -n 2 ./meshtest -dm_plex_shape sphere -dm_refine_pre 3 -dm_distribute -dm_refine 2</div><div><br></div><div>and then call DMExtrude() by hand after that. Alternatively, I could make a pre-extrusion refinement option.</div><div><br></div><div> Thanks,</div><div><br></div><div> Matt</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div><div><div>Thanks,</div><div>Bhargav</div><div><br></div><div>/* refine the sequential mesh first */<br> for (int r = 0; r < numRefinePre; ++r) {<br> DM rdm = NULL;<br> DMRefine(dm, MPI_COMM_WORLD, &rdm);<br> DMDestroy(&dm);<br> dm = rdm;<br> }<br><br> /* project to a unit sphere */<br> ierr = ProjectToUnitSphere(dm); CHKERRQ(ierr);<br><br> /* create and distribute DM */<br> ierr = DMPlexDistribute(dm, 0, NULL, &dmDist);CHKERRQ(ierr);<br> if (dmDist) {<br> DMDestroy(&dm);<br> dm = dmDist;<br> }<br><br> /* refine the mesh in parallel */<br> for (int r = 0; r < numRefine; ++r) {<br> DM rdm = NULL;<br> DMRefine(dm, MPI_COMM_WORLD, &rdm);<br> DMDestroy(&dm);<br> dm = rdm;<br> }<br><br> /* project to a unit sphere */<br> ierr = ProjectToUnitSphere(dm); CHKERRQ(ierr);<br><br> ierr = DMPlexExtrude(dm, numLayers-1, radialThickness, PETSC_FALSE, NULL, PETSC_TRUE, &dm3D);CHKERRQ(ierr);<br><br> if (dm3D) {<br> DMDestroy(&dm);<br> dm = dm3D;<br> }<br></div><div><br></div></div></div></div>
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