Thank you, this is very practical for defining fields. However, I cannot see the fields graphically. When I use the "Put on view" button and click on "New view", a colorbar appears, but nothing changes at the location where the field is.
Did I miss something? Matthias > -----Original Message----- > From: Christophe Geuzaine [mailto:[email protected]] > Sent: Wednesday, January 07, 2009 7:50 AM > To: Zenker, Dr. Matthias > Cc: [email protected] > Subject: Re: [Gmsh] lower limit for characteristic length > > Zenker, Dr. Matthias wrote: > > Hi, > > > > (just returned from holidays...) > > thank you for the hint with the fields, I will try it that way. > > I have examined demos/fields.geo. Seems like I have to > enter all that > > field-related stuff by hand. I don't mind to do so, but is there a > > more elegant way, using the GUI? And can I visualize the defined > > fields before starting the meshing? > > Yes: download the latest nightly snapshot, and in the Mesh > module click on "Define", then "Fields". > > > > > > > Best regards, > > > > Matthias > > > >> -----Original Message----- > >> From: Christophe Geuzaine [mailto:[email protected]] > >> Sent: Tuesday, December 16, 2008 9:41 AM > >> To: Zenker, Dr. Matthias > >> Cc: [email protected] > >> Subject: Re: [Gmsh] lower limit for characteristic length > >> > >> Zenker, Dr. Matthias wrote: > >>> Of course. Here it is. > >>> > >>> BTW, I use gmsh 2.2.6 on a WIN XP SP 2, Pentium 4, 3.2 GHz, > >> 1.5 GB RAM > >>> computer. > >>> > >> The default random perturbation factor seems to be a bit > >> small in your case. The following (increased "-rand" from > >> "1.e-9" to "1.e-7") > >> > >> gmsh small_cl.geo -2 -rand 1.e-7 > >> > >> seems to work just fine, but I had to stop it before the end > >> due to insufficient memory on my laptop. Multiplying all the > >> element sizes by 3 and using the faster del2d algorithm > >> > >> gmsh small_cl.geo -2 -rand 1.e-7 -clscale 3 -algo del2d > >> > >> produced a nice mesh with about 23 million triangles. > >> > >> > >>> If I could force gmsh not to ignore the cl of the spline control > >>> points, it would probably be faster for such a case (if > it wouldn't > >>> crash). Is there a trick to do that? Would it help to put > isolated > >>> points with the desired cl at the desired location? > >> You should probably use Fields to fine-tune the element > >> sizes. There are some examples on the mailing list, as well > >> as in demos/fields.geo. > >> > >> > >> > >>> Thank you and best regards, > >>> > >>> Matthias > >>> > >>>> -----Original Message----- > >>>> From: Christophe Geuzaine [mailto:[email protected]] > >>>> Sent: Monday, December 15, 2008 1:07 PM > >>>> To: Zenker, Dr. Matthias > >>>> Cc: [email protected] > >>>> Subject: Re: [Gmsh] lower limit for characteristic length > >>>> > >>>> Zenker, Dr. Matthias wrote: > >>>>> Hi there, > >>>>> > >>>>> the question remains: is there a lower limit for the > >> characteristic > >>>>> length cl, and why does gmsh crash when some points have > >> a small cl? > >>>> It shouldn't crash, except when "cl" divided by the overall > >>>> size of model is getting close to machine accuracy (or more > >>>> accurately, close to the value of the random pertutbation > >>>> used in the meshing algorithms, which is 1e-9 by default). > >>>> > >>>> Could you send a file that shows the problem? > >>>> > >>>> > >>>>> I would like to add another one: Is it possible that gmsh > >>>> ignores the > >>>>> cl of the control points of a spline except for the first > >> and last > >>>>> one? If > >>>> That's what Gmsh does: the cls of the control points are ignored. > >>>> > >>>> > >>>> > >>>>> so, is there a way to force gmsh to take into account the > >> cl of the > >>>>> intermediate points also? > >>>>> > >>>>> Best regards, > >>>>> > >>>>> Matthias > >>>>> > >>>>> > >>>> -------------------------------------------------------------- > >>>> ---------- > >>>>> *From:* [email protected] > >> [mailto:[email protected]] *On > >>>>> Behalf Of *Zenker, Dr. Matthias > >>>>> *Sent:* Monday, November 17, 2008 10:49 AM > >>>>> *To:* [email protected] > >>>>> *Subject:* Re: [Gmsh] lower limit for characteristic length > >>>>> > >>>>> I was wrong, it crashes also for cl=0.0005 (but after a > >>>> looong time, > >>>>> and with a runtime error). > >>>>> > >>>>> > >>>> -------------------------------------------------------------- > >>>> ---------- > >>>>> *From:* [email protected] > >>>> [mailto:[email protected]] *On > >>>>> Behalf Of *Zenker, Dr. Matthias > >>>>> *Sent:* Monday, November 17, 2008 10:16 AM > >>>>> *To:* [email protected] > >>>>> *Subject:* [Gmsh] lower limit for characteristic length > >>>>> > >>>>> Hi, > >>>>> > >>>>> I wonder if there is a lower limit for the > characteristic > >>>>> length. I have a rather simple 2D geometry, and if > >>>> I set the cl > >>>>> for just two points to 0.0001, gmsh crashes during > >>>> the meshing > >>>>> after having given the error message "3 identical > >> points in > >>>>> Qtest". The .gmsh-errors file is not written. With > >>>> cl=0.0005, > >>>>> this does not happen (but it takes veeery long to > >>>> compute the mesh). > >>>>> Best regards, > >>>>> > >>>>> Matthias > >>>>> > >>>>> > >>>> ---------------------------------------------------------------- > >>>>> ERBE Elektromedizin GmbH > >>>>> Dr.rer.nat. Matthias Zenker > >>>>> Dipl. Phys. > >>>>> Grundlagenentwicklung Technologie > >>>>> Waldhoernlestrasse 17 > >>>>> D-72072 Tuebingen > >>>>> Tel.: + 49 (0) 7071 - 755 226 > >>>>> Fax: + 49 (0) 7071 - 755 5226 > >>>>> E-Mail: <_mailto:[email protected]_> > >>>>> URL: _http://www.ERBE-med.de_ > >>>>> > >>>>> ---------------------------------------------------------------- > >>>>> > >>>>> > >>>>> > >>>>> > >>>>> > >>>>> ERBE Elektromedizin GmbH > >>>>> Firmensitz: 72072 Tuebingen > >>>>> Geschaeftsfuehrer: Christian O. Erbe, Reiner Thede > >>>>> Registergericht: Stuttgart HRB 380137 > >>>>> > >>>>> > >>>>> > >>>>> > >>>>> > >>>>> > >>>>> ERBE Elektromedizin GmbH > >>>>> Firmensitz: 72072 Tuebingen > >>>>> Geschaeftsfuehrer: Christian O. Erbe, Reiner Thede > >>>>> Registergericht: Stuttgart HRB 380137 > >>>>> > >>>>> > >>>>> > >>>>> > >>>>> > >>>>> > >>>>> ERBE Elektromedizin GmbH > >>>>> Firmensitz: 72072 Tuebingen > >>>>> Geschaeftsfuehrer: Christian O. Erbe, Reiner Thede > >>>>> Registergericht: Stuttgart HRB 380137 > >>>>> > >>>>> > >>>>> > >>>>> > >> > ---------------------------------------------------------------------- > >>>>> -- > >>>>> > >>>>> _______________________________________________ > >>>>> gmsh mailing list > >>>>> [email protected] > >>>>> http://www.geuz.org/mailman/listinfo/gmsh > >>>> -- > >>>> Prof. Christophe Geuzaine > >>>> University of Liege, Electrical Engineering and Computer > >>>> Science http://www.montefiore.ulg.ac.be/~geuzaine > >>>> > >>> > >> > _____________________________________________________________________ > >>> ERBE Elektromedizin GmbH > >>> Firmensitz: 72072 Tuebingen > >>> Geschaeftsfuehrer: Christian O. Erbe, Reiner Thede > >>> Registergericht: Stuttgart HRB 380137 > >>> > >>> > >>> > >>> > >> -------------------------------------------------------------- > >> ---------- > >>> _______________________________________________ > >>> gmsh mailing list > >>> [email protected] > >>> http://www.geuz.org/mailman/listinfo/gmsh > >> > >> -- > >> Prof. Christophe Geuzaine > >> University of Liege, Electrical Engineering and Computer Science > >> http://www.montefiore.ulg.ac.be/~geuzaine > >> > >> > >> > > > > > _____________________________________________________________________ > > ERBE Elektromedizin GmbH > > Firmensitz: 72072 Tuebingen > > Geschaeftsfuehrer: Christian O. Erbe, Reiner Thede > > Registergericht: Stuttgart HRB 380137 > > > > > > _______________________________________________ > > gmsh mailing list > > [email protected] > > http://www.geuz.org/mailman/listinfo/gmsh > > > > > > > -- > Prof. Christophe Geuzaine > University of Liege, Electrical Engineering and Computer Science > http://www.montefiore.ulg.ac.be/~geuzaine > > _____________________________________________________________________ ERBE Elektromedizin GmbH Firmensitz: 72072 Tuebingen Geschaeftsfuehrer: Christian O. Erbe, Reiner Thede Registergericht: Stuttgart HRB 380137 _______________________________________________ gmsh mailing list [email protected] http://www.geuz.org/mailman/listinfo/gmsh
