Hullo David, I see what you mean, but you do this editing the .geo file, and not interactively through the GUI... the latter possibility would be a great advantage...
Regards, Alessandro -----Messaggio originale----- Da: David Colignon [mailto:[email protected]] Inviato: giovedì 24 ottobre 2013 15.36 A: Alessandro Vicini; 'Umberto Iemma'; [email protected] Oggetto: Re: R: [Gmsh] Integer flag to .msh elements On 24/10/13 13:38, Alessandro Vicini wrote: > Hullo everybody, > > the problem is (as far as I know), that when you assign a surface to a > physical group, you don't have control on the number of the group, > which is automatically assigned by Gmesh. No. See t1.geo. If you write Physical Surface (5555) = {6} ; in t1.geo file, mesh it and save the mesh, the elements belonging to surface 6 will be tagged with the 5555 integer. ace35:~/gmsh/tutorial > cat t1.msh $MeshFormat 2.2 0 8 $EndMeshFormat $Nodes 427 1 0 0 0 2 0.1 0 0 3 0.1 0.3 0 4 0 0.3 0 5 0.009999999999982483 0 0 6 0.019999999999956 0 0 7 0.02999999999992728 0 0 8 0.03999999999989585 0 0 ... ... ... 426 0.01732880869837657 0.1002635856800227 0 427 0.06912838083014602 0.1057967588383864 0 $EndNodes $Elements 844 1 15 2 1 1 1 2 15 2 1 2 2 3 1 2 99 1 1 5 4 1 2 99 1 5 6 5 1 2 99 1 6 7 ... ... ... 71 1 2 99 4 79 80 72 1 2 99 4 80 1 73 2 2 5555 6 33 308 214 ##### 74 2 2 5555 6 105 229 284 75 2 2 5555 6 106 228 285 76 2 2 5555 6 122 234 316 77 2 2 5555 6 135 238 262 78 2 2 5555 6 60 166 282 79 2 2 5555 6 84 196 170 80 2 2 5555 6 97 197 170 81 2 2 5555 6 127 245 183 82 2 2 5555 6 54 164 270 83 2 2 5555 6 174 347 154 84 2 2 5555 6 84 170 337 85 2 2 5555 6 75 76 172 ... ... ... Dave If I understand what Umberto is saying > (which is the same thing that would be useful in my case), it would be > nice to have the possibility of explicitly assigning these integer > flags to surfaces (or groups of surfaces), in order to specify boundary conditions. > > Regards, > > Alessandro > > > > -----Messaggio originale----- > Da: [email protected] > [mailto:[email protected]] Per conto di David > Colignon > Inviato: giovedì 24 ottobre 2013 13.02 > A: Umberto Iemma; [email protected] > Oggetto: Re: [Gmsh] Integer flag to .msh elements > > > On 24/10/13 11:57, Umberto Iemma wrote: >> >> First, I'd like to thank the authors for the wonderful work they are >> doing > ! >> Gmsh is one of the most useful free technical tools ever! >> Thanks! >> >> After this, I have a question. >> >> It is possible to include in the .msh file a integer flag to each >> element > ? >> I need this to specify particular physical properties of the boundary. > > > Hi Umberto, > > you should use Physical groups for that purpose, see > http://geuz.org/gmsh/doc/texinfo/gmsh.html#Elementary-vs-physical-enti > ties > > "Groups of elementary geometrical entities can also be defined and are > called physical entities. > These physical entities cannot be modified by geometry commands: their > only purpose is to assemble elementary entities into larger groups, > possibly modifying their orientation, so that they can be referred to > by the mesh module as single entities. As is the case with elementary > entities, each physical point, physical line, physical surface or > physical volume must be assigned a unique identification number. " > > > and tutorial t1.geo, > http://geuz.org/gmsh/doc/texinfo/gmsh.html#t1_002egeo > > > Regards, > > Dave > > -- > David Colignon, Ph.D. > Collaborateur Logistique du F.R.S.-FNRS CÉCI - Consortium des > Équipements de Calcul Intensif ACE - Applied & Computational > Electromagnetics Université de Liège Sart-Tilman B28 10, Grande > Traverse > 4000 Liège - BELGIQUE > Tél: +32 (0)4 366 37 32 > WWW: http://www.ceci-hpc.be/ > >> >> I'm the coordinator of the open-source project AcouSTO >> http://acousto.sourceforge.net, a tool for acoustic simulation. I'm >> going to release soon version 1.6 including the possibility to read >> Gmsh > files. >> Everything is working fine and the release candidate could be issued >> now, but this additional possibility would broaden significantly the >> field of application. >> >> Thanks in advance, >> Umberto >> >> ***************************************************************** >> Prof. Umberto IEMMA >> Associate Professor of Aerospace Structures and Design >> Dip. di Ingegneria - Universita' Roma Tre >> via Vito Volterra 62, 00146 Roma >> tel. +39-0657333274 fax +39-065593732 >> www : http://acousto.sourceforge.net >> ***************************************************************** >> >> >> >> >> >> >> >> >> >> _______________________________________________ >> gmsh mailing list >> [email protected] >> http://www.geuz.org/mailman/listinfo/gmsh >> > > > _______________________________________________ > gmsh mailing list > [email protected] > http://www.geuz.org/mailman/listinfo/gmsh > _______________________________________________ gmsh mailing list [email protected] http://www.geuz.org/mailman/listinfo/gmsh
