<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><br><div><div>Le 1 sept. 2011 à 14:11, Cristóbal Bertoglio B. a écrit :</div><br class="Apple-interchange-newline"><blockquote type="cite"><div>Hi<br><br>so I re-run the meshing in old testcases and the Delaunay (plus the<br>two types of optimization) gives always better meshes than in the<br>frontal case, and without tetras with the 4 vertices on the external<br>surface.<br><br>The price is that it creates much more nodes, but the real problem is<br>it creates also additional triangles on the surface (what it is not<br>convenient for me since I'm doing FSI).<br><br>Hence, it is possible to tell gmsh not to create additional triangles<br>on the surface ? (if yes this would be already great).<br><br></div></blockquote><div><br></div><div>Only using the frontal mesher, sorry</div><div><br></div><div>JF</div><div><br></div><br><blockquote type="cite"><div>Thanks<br><br>Cristobal.<br><br>2011/9/1 Christophe Geuzaine <<a href="mailto:cgeuzaine@ulg.ac.be">cgeuzaine@ulg.ac.be</a>>:<br><blockquote type="cite"><br></blockquote><blockquote type="cite">On 31 Aug 2011, at 14:13, Cristóbal Bertoglio B. wrote:<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite"><blockquote type="cite">Hi<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">I'm trying to construct a volumetric mesh from an already existing surface mesh.<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">In past tests I was using the Frontal algorithm (+ netgen<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">optimization) since it gave me less nodes, no surface triangles and no<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">tetrahedra with the 4 nodes on the external surface. However, when<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">running it for this example gives several errors of type I indicate<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">bellow.<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">In contrast, Algorithm 1 works perfectly (however it produces more<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">nodes, create surface triangles and give me tetrahedra with the 4<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">nodes on the external surface, all things that I want to avoid).<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">Does some know the reason why Delaunay works and Frontal doesn't ?<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">Hi Cristobal,<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">The frontal algorithm is definitely less robust than the Delaunay. Do you still get bad tets if you optimize your mesh ("Optimize" and/or "Optimize Netgen") in the mesh menu?<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite"><blockquote type="cite">The mesh is also attached.<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">Thanks in advance,<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">Cristobal.<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">-------------<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">Info : Meshing volume 0 (Frontal)<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">Info : Region 0 Face 1, 3 intersect<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">Info : CalcLocalH: 13932 Points 0 Elements 27860 Surface Elements<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">Info : Check subdomain 1 / 1<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">Info : 27860 open elements<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">Error : ERROR: Edge 20 - 33 multiple times in surface mesh<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">......<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">Error : ERROR: Surface mesh not consistent<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">Error : ERROR: Stop meshing since surface mesh not consistent<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">Info : Mesh 3D complete (1.84027 s)<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">Info : 13932 vertices 27860 elements<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">Error : ------------------------------<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">Error : Mesh generation error summary<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">Error : 0 warnings<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">Error : 201 errors<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">Error : Check the full log for details<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><aorta.stl>_______________________________________________<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">gmsh mailing list<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><a href="mailto:gmsh@geuz.org">gmsh@geuz.org</a><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><a href="http://www.geuz.org/mailman/listinfo/gmsh">http://www.geuz.org/mailman/listinfo/gmsh</a><br></blockquote></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">--<br></blockquote><blockquote type="cite">Prof. Christophe Geuzaine<br></blockquote><blockquote type="cite">University of Liege, Electrical Engineering and Computer Science<br></blockquote><blockquote type="cite"><a href="http://www.montefiore.ulg.ac.be/~geuzaine">http://www.montefiore.ulg.ac.be/~geuzaine</a><br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite"><br></blockquote><br>_______________________________________________<br>gmsh mailing list<br><a href="mailto:gmsh@geuz.org">gmsh@geuz.org</a><br>http://www.geuz.org/mailman/listinfo/gmsh<br></div></blockquote></div><br><div>
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