I'm interested in knowing how the differences arise. I can understand how different machines, compilers can give numerical results that differ at the limits of the selected precision, but it's not obvious how this leads to the generation of different meshes.
Gib ________________________________ From: gmsh <[email protected]> on behalf of moritz braun <[email protected]> Sent: Monday, 1 July 2019 10:28 p.m. To: Christophe Geuzaine Cc: [email protected]; [email protected] Subject: [FORGED] Re: [Gmsh] Windows, Ubuntu give different meshes Dear Christophe I assume identical geometries leading to different meshes between different versions of redhat 7.4 to 7.6 can be expected. I was quite surprised because my self consitent code behaved differently depending on the redhat version and now I understand! Regards Moritz On Fri, Jun 28, 2019 at 8:04 AM Christophe Geuzaine <[email protected]<mailto:[email protected]>> wrote: > On 27 Jun 2019, at 03:33, Gib Bogle > <[email protected]<mailto:[email protected]>> wrote: > > I have been testing with the demo file cube.geo: > > lc = 0.3; > Point(1) = {0.0,0.0,0.0,lc}; > Point(2) = {1,0.0,0.0,lc}; > Point(3) = {1,1,0.0,lc}; > Point(4) = {0,1,0.0,lc}; > Line(1) = {4,3}; > Line(2) = {3,2}; > Line(3) = {2,1}; > Line(4) = {1,4}; > Line Loop(5) = {2,3,4,1}; > Plane Surface(6) = {5}; > tmp[] = Extrude {0,0.0,1} { > Surface{6}; > }; > Physical Volume(1) = tmp[1]; > > I generate the mesh file at the command line like this: > > gmsh -3 cube.geo > > on a Windows 7 machine and on Ubuntu 16.04. The gmsh version is 4.3.0. > > I find that the meshes created on the two systems are a bit different. On > Windows the mesh has 137 nodes and 372 elements, while on Ubuntu it has 136 > nodes and 373 elements. > > Should I be concerned about this? No, on the same machine the meshes should be identical, but across OSes (and different compilers) small variations are normal. Christophe > > Thanks > Gib > _______________________________________________ > gmsh mailing list > [email protected]<mailto:[email protected]> > http://onelab.info/mailman/listinfo/gmsh - Prof. Christophe Geuzaine University of Liege, Electrical Engineering and Computer Science http://www.montefiore.ulg.ac.be/~geuzaine _______________________________________________ gmsh mailing list [email protected]<mailto:[email protected]> http://onelab.info/mailman/listinfo/gmsh -- Prof M Braun Tel.:27-12-4298006/8027 Physics Department Fax.: 27-12-4293643 University of South Africa (UNISA) [email protected]<mailto:[email protected]> P.O. Box 392 0003 UNISA South Africa http://moritz-braun.blogspot.com
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