<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman, new york, times, serif;font-size:12pt"><DIV>Thanks Matthias!</DIV>
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<DIV>All the best,</DIV>
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<DIV>Marc<BR><BR></DIV>
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<B><SPAN style="FONT-WEIGHT: bold">De :</SPAN></B> "Zenker, Dr. Matthias" <Matthias.Zenker@erbe-med.com><BR><B><SPAN style="FONT-WEIGHT: bold">À :</SPAN></B> Marc Secca <mksca220@yahoo.fr><BR><B><SPAN style="FONT-WEIGHT: bold">Cc :</SPAN></B> gmsh@geuz.org<BR><B><SPAN style="FONT-WEIGHT: bold">Envoyé le :</SPAN></B> Mer 30 mars 2011, 12h 32min 36s<BR><B><SPAN style="FONT-WEIGHT: bold">Objet :</SPAN></B> AW: Re : AW: Re : AW: Re : AW: [Gmsh] Mesh STEP file<BR></FONT><BR>
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<DIV dir=ltr align=left><SPAN class=430202311-30032011><FONT color=#0000ff size=2 face=Arial>Hi Marc,</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=430202311-30032011><FONT color=#0000ff size=2 face=Arial></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=430202311-30032011><FONT color=#0000ff size=2 face=Arial>indeed I don't see physical entities in your mesh. You can check yourself, the format is easily human readable. Have a look at the gmsh reference manual, chapter 9.1: <A href="http://www.geuz.org/gmsh/doc/texinfo/gmsh.html#MSH-ASCII-file-format" rel=nofollow target=_blank>http://www.geuz.org/gmsh/doc/texinfo/gmsh.html#MSH-ASCII-file-format</A></FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=430202311-30032011><FONT color=#0000ff size=2 face=Arial><SPAN class=430202311-30032011><FONT color=#0000ff size=2 face=Arial>I don't know what went wrong here.</FONT></SPAN></FONT></SPAN></DIV>
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<DIV dir=ltr align=left><SPAN class=430202311-30032011><FONT color=#0000ff size=2 face=Arial>I have never used dolfyn and cannot comment on the error you report.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=430202311-30032011><FONT color=#0000ff size=2 face=Arial></FONT></SPAN> </DIV>
<DIV><SPAN class=430202311-30032011><FONT color=#0000ff size=2 face=Arial>So unfortunately, I cannot help you at the moment, but someone else on the list certainly will...</FONT></SPAN></DIV>
<DIV><SPAN class=430202311-30032011><FONT color=#0000ff size=2 face=Arial></FONT></SPAN> </DIV>
<DIV><SPAN class=430202311-30032011><FONT color=#0000ff size=2 face=Arial>Good luck!</FONT></SPAN></DIV>
<DIV><SPAN class=430202311-30032011><FONT color=#0000ff size=2 face=Arial></FONT></SPAN> </DIV>
<DIV><SPAN class=430202311-30032011><FONT color=#0000ff size=2 face=Arial>Matthias</FONT></SPAN></DIV>
<DIV><SPAN class=430202311-30032011><FONT color=#0000ff size=2 face=Arial></FONT></SPAN> </DIV>
<DIV><SPAN class=430202311-30032011><FONT color=#0000ff size=2 face=Arial>P.S.: If you reply to the list (<A href="mailto:gmsh@geuz.org" rel=nofollow target=_blank ymailto="mailto:gmsh@geuz.org">gmsh@geuz.org</A>), you give the other participants a chance to help you...</FONT></SPAN></DIV>
<P><SPAN lang=de><FONT size=2 face=Arial>----------------------------------------------------------------</FONT></SPAN> <BR><SPAN lang=de><FONT size=2 face=Arial>ERBE Elektromedizin GmbH</FONT></SPAN> <BR><SPAN lang=de><FONT size=2 face=Arial>Dr.rer.nat. Matthias Zenker</FONT></SPAN> <BR><SPAN lang=de><FONT size=2 face=Arial>Dipl. Phys.</FONT></SPAN> <BR><SPAN lang=de><FONT size=2 face=Arial>Grundlagenentwicklung / Fundamental Development</FONT></SPAN> <BR><SPAN lang=de><FONT size=2 face=Arial>Waldhoernlestrasse 17</FONT></SPAN> <BR><SPAN lang=de><FONT size=2 face=Arial>72072 Tuebingen</FONT></SPAN> <BR><SPAN lang=de><FONT size=2 face=Arial>Germany</FONT></SPAN> <BR><SPAN lang=de><FONT size=2 face=Arial>Phone + 49 (0) 7071 755 - 226</FONT></SPAN> <BR><SPAN lang=de><FONT size=2 face=Arial>Fax + 49 (0) 7071 755 - 5226</FONT></SPAN> <BR><SPAN lang=de><FONT size=2 face=Arial>E-Mail: <<A href="mailto:Matthias.Zenker@erbe-med.com" rel=nofollow target=_blank
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<FONT size=2 face=Tahoma><B>Von:</B> Marc Secca [mailto:mksca220@yahoo.fr] <BR><B>Gesendet:</B> Mittwoch, 30. März 2011 11:56<BR><B>An:</B> Zenker, Dr. Matthias<BR><B>Betreff:</B> Re : AW: Re : AW: Re : AW: [Gmsh] Mesh STEP file<BR></FONT><BR></DIV>
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<DIV>There you go!</DIV>
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<DIV>Thanks!<BR></DIV>
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<B><SPAN style="FONT-WEIGHT: bold">De :</SPAN></B> "Zenker, Dr. Matthias" <Matthias.Zenker@erbe-med.com><BR><B><SPAN style="FONT-WEIGHT: bold">À :</SPAN></B> Marc Secca <mksca220@yahoo.fr><BR><B><SPAN style="FONT-WEIGHT: bold">Envoyé le :</SPAN></B> Mer 30 mars 2011, 10h 33min 13s<BR><B><SPAN style="FONT-WEIGHT: bold">Objet :</SPAN></B> AW: Re : AW: Re : AW: [Gmsh] Mesh STEP file<BR></FONT><BR>
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<DIV dir=ltr align=left><SPAN class=414363109-30032011><FONT color=#0000ff size=2 face=Arial>Hi Marc,</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=414363109-30032011><FONT color=#0000ff size=2 face=Arial></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=414363109-30032011><FONT color=#0000ff size=2 face=Arial>could you send me the e-Mail again with a compressed attachment (e.g. zip), our system seems not to like .msh files.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=414363109-30032011><FONT color=#0000ff size=2 face=Arial></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=414363109-30032011><FONT color=#0000ff size=2 face=Arial>Matthias</FONT></SPAN></DIV>
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<P><SPAN lang=de><FONT size=2 face=Arial>----------------------------------------------------------------</FONT></SPAN> <BR><SPAN lang=de><FONT size=2 face=Arial>ERBE Elektromedizin GmbH</FONT></SPAN> <BR><SPAN lang=de><FONT size=2 face=Arial>Dr.rer.nat. Matthias Zenker</FONT></SPAN> <BR><SPAN lang=de><FONT size=2 face=Arial>Dipl. Phys.</FONT></SPAN> <BR><SPAN lang=de><FONT size=2 face=Arial>Grundlagenentwicklung / Fundamental Development</FONT></SPAN> <BR><SPAN lang=de><FONT size=2 face=Arial>Waldhoernlestrasse 17</FONT></SPAN> <BR><SPAN lang=de><FONT size=2 face=Arial>72072 Tuebingen</FONT></SPAN> <BR><SPAN lang=de><FONT size=2 face=Arial>Germany</FONT></SPAN> <BR><SPAN lang=de><FONT size=2 face=Arial>Phone + 49 (0) 7071 755 - 226</FONT></SPAN> <BR><SPAN lang=de><FONT size=2 face=Arial>Fax + 49 (0) 7071 755 - 5226</FONT></SPAN> <BR><SPAN lang=de><FONT size=2 face=Arial>E-Mail: <<A href="mailto:Matthias.Zenker@erbe-med.com" rel=nofollow target=_blank
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<FONT size=2 face=Tahoma><B>Von:</B> Marc Secca [mailto:mksca220@yahoo.fr] <BR><B>Gesendet:</B> Mittwoch, 30. März 2011 11:12<BR><B>An:</B> Zenker, Dr. Matthias<BR><B>Betreff:</B> Re : AW: Re : AW: [Gmsh] Mesh STEP file<BR></FONT><BR></DIV>
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<DIV>Hi Matthias,</DIV>
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<DIV>Thanks again for your help. I created the mesh as you advised:</DIV>
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<DIV>1.
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN class=701562507-30032011>* Open Tools->Options->Mesh->General and set the Max element size to something like 10 ini your case.</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN class=701562507-30032011>* Open Tools->Options->Mesh->Advanced and select "Compute element sizes from curvature"</SPAN></FONT><BR>2. I saved the mesh with the option Save all (ignore Physical groups) unticked. I thus defined all the surfaces and volumes of the geometry as physical groups. There should be 4 in total (1 volume and 3 surface sets)</DIV>
<DIV dir=ltr align=left> </DIV>
<DIV dir=ltr align=left>I have attached the resulting mesh file. This time, I didn't give the boundaries any names but left them as the numbers they were assigned. Can you tell me if you can see the physical groups in the mesh file and how to look for them? </DIV></DIV>
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<DIV style="FONT-FAMILY: times new roman, new york, times, serif; FONT-SIZE: 12pt">Also, I don't know if you have used dolfyn CFD solver before but when I put the mesh through the preprocessor, I get several errors saying that:"Inconsistent data: Physical names ids overlap 1"</DIV>
<DIV style="FONT-FAMILY: times new roman, new york, times, serif; FONT-SIZE: 12pt">Any ideas what is going wrong?</DIV>
<DIV style="FONT-FAMILY: times new roman, new york, times, serif; FONT-SIZE: 12pt"> </DIV>
<DIV style="FONT-FAMILY: times new roman, new york, times, serif; FONT-SIZE: 12pt">Your help is very much appreciated. Thanks</DIV>
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<DIV style="FONT-FAMILY: times new roman, new york, times, serif; FONT-SIZE: 12pt">Marc<BR></DIV>
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<B><SPAN style="FONT-WEIGHT: bold">De :</SPAN></B> "Zenker, Dr. Matthias" <Matthias.Zenker@erbe-med.com><BR><B><SPAN style="FONT-WEIGHT: bold">À :</SPAN></B> Marc Secca <mksca220@yahoo.fr><BR><B><SPAN style="FONT-WEIGHT: bold">Cc :</SPAN></B> gmsh@geuz.org<BR><B><SPAN style="FONT-WEIGHT: bold">Envoyé le :</SPAN></B> Mer 30 mars 2011, 9h 00min 03s<BR><B><SPAN style="FONT-WEIGHT: bold">Objet :</SPAN></B> AW: Re : AW: [Gmsh] Mesh STEP file<BR></FONT><BR>
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<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN class=701562507-30032011>Hi Marc,</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN class=701562507-30032011></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN class=701562507-30032011>what you do seems resonable to me.</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN class=701562507-30032011>When you save the mesh, you have the choice to ignore physical groups, so everything is saved, or to save just the physical groups. In the latter case, you have to define every surface and volume as physical if you want to have it saved. As far as I see, the physical groups appear as numbers in the mesh. I have never tried to name them, so someone else has to help you here.</SPAN></FONT></DIV>
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<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN class=701562507-30032011>To make a finer mesh, you can do one or more of the following things:</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN class=701562507-30032011></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN class=701562507-30032011>* Assign a characteristic length to the points. There is a possibility to do this with the GUI, but I don't remember it right now. You can still do it in the geo file.</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN class=701562507-30032011>* Open Tools->Options->Mesh->General and set the Max element size to something like 10 ini your case.</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN class=701562507-30032011>* Open Tools->Options->Mesh->Advanced and select "Compute element sizes from curvature"</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff size=2 face=Arial></FONT> </DIV>
<DIV><FONT color=#0000ff size=2 face=Arial><SPAN class=701562507-30032011>You can have a look at <A href="http://www.geuz.org/gmsh/screencasts/" rel=nofollow target=_blank>http://www.geuz.org/gmsh/screencasts/</A> where the GUI is demonstrated.</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff size=2 face=Arial><SPAN class=701562507-30032011>(@gmsh team: It would be nice to add in the reference manual how the described commands can be executed from the GUI.)</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff size=2 face=Arial></FONT> </DIV>
<DIV><SPAN class=701562507-30032011><FONT color=#0000ff size=2 face=Arial>HTH,</FONT></SPAN></DIV>
<DIV><SPAN class=701562507-30032011><FONT color=#0000ff size=2 face=Arial></FONT></SPAN> </DIV>
<DIV><SPAN class=701562507-30032011><FONT color=#0000ff size=2 face=Arial>Matthias</FONT></SPAN></DIV>
<DIV><SPAN lang=de><FONT size=2 face=Arial></FONT></SPAN> </DIV>
<DIV><SPAN lang=de><FONT size=2 face=Arial>----------------------------------------------------------------</FONT></SPAN> <BR><SPAN lang=de><FONT size=2 face=Arial>ERBE Elektromedizin GmbH</FONT></SPAN> <BR><SPAN lang=de><FONT size=2 face=Arial>Dr.rer.nat. Matthias Zenker</FONT></SPAN> <BR><SPAN lang=de><FONT size=2 face=Arial>Dipl. Phys.</FONT></SPAN> <BR><SPAN lang=de><FONT size=2 face=Arial>Grundlagenentwicklung / Fundamental Development</FONT></SPAN> <BR><SPAN lang=de><FONT size=2 face=Arial>Waldhoernlestrasse 17</FONT></SPAN> <BR><SPAN lang=de><FONT size=2 face=Arial>72072 Tuebingen</FONT></SPAN> <BR><SPAN lang=de><FONT size=2 face=Arial>Germany</FONT></SPAN> <BR><SPAN lang=de><FONT size=2 face=Arial>Phone + 49 (0) 7071 755 - 226</FONT></SPAN> <BR><SPAN lang=de><FONT size=2 face=Arial>Fax + 49 (0) 7071 755 - 5226</FONT></SPAN> <BR><SPAN lang=de><FONT size=2 face=Arial>E-Mail: <<A href="mailto:Matthias.Zenker@erbe-med.com" rel=nofollow
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<FONT size=2 face=Tahoma><B>Von:</B> Marc Secca [mailto:mksca220@yahoo.fr] <BR><B>Gesendet:</B> Dienstag, 29. März 2011 14:06<BR><B>An:</B> Zenker, Dr. Matthias<BR><B>Betreff:</B> Re : AW: [Gmsh] Mesh STEP file<BR></FONT><BR></DIV>
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<DIV style="FONT-FAMILY: times new roman, new york, times, serif; FONT-SIZE: 12pt">Hi Matthias,</DIV>
<DIV style="FONT-FAMILY: times new roman, new york, times, serif; FONT-SIZE: 12pt"> </DIV>
<DIV style="FONT-FAMILY: times new roman, new york, times, serif; FONT-SIZE: 12pt">Thanks for the reply!</DIV>
<DIV style="FONT-FAMILY: times new roman, new york, times, serif; FONT-SIZE: 12pt">I'm using the dolfyn cfd solver and it requires to define physical groups in gmsh in order to specify boundary conditions. How can I define these physical groups for that particular case?</DIV>
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<DIV style="FONT-FAMILY: times new roman, new york, times, serif; FONT-SIZE: 12pt">1. merge the step file into a .geo file</DIV>
<DIV style="FONT-FAMILY: times new roman, new york, times, serif; FONT-SIZE: 12pt">2. select geometry/physical groups/add/then the surfaces and volume as required</DIV>
<DIV style="FONT-FAMILY: times new roman, new york, times, serif; FONT-SIZE: 12pt">3. rename the physical groups ( inlet...etc)</DIV>
<DIV style="FONT-FAMILY: times new roman, new york, times, serif; FONT-SIZE: 12pt">4. mesh (2D first then 3D)/ optimize and save the .msh file.</DIV>
<DIV style="FONT-FAMILY: times new roman, new york, times, serif; FONT-SIZE: 12pt"> </DIV>
<DIV style="FONT-FAMILY: times new roman, new york, times, serif; FONT-SIZE: 12pt">Then when I try open the .msh file, my physical group names don't appear anywhere?</DIV>
<DIV style="FONT-FAMILY: times new roman, new york, times, serif; FONT-SIZE: 12pt"> </DIV>
<DIV style="FONT-FAMILY: times new roman, new york, times, serif; FONT-SIZE: 12pt">Can you tell me if i'm doing this right? Am I missing something?</DIV>
<DIV style="FONT-FAMILY: times new roman, new york, times, serif; FONT-SIZE: 12pt">Also If I select 3D when meshing, the mesh is really coarse. I then refine it but it doesn't converge and crashes as a result? Can you shed some light on this issue?</DIV>
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<DIV style="FONT-FAMILY: times new roman, new york, times, serif; FONT-SIZE: 12pt">Thanks!</DIV>
<DIV style="FONT-FAMILY: times new roman, new york, times, serif; FONT-SIZE: 12pt">Marc</DIV>
<DIV style="FONT-FAMILY: times new roman, new york, times, serif; FONT-SIZE: 12pt"> </DIV>
<DIV style="FONT-FAMILY: times new roman, new york, times, serif; FONT-SIZE: 12pt">PS:I'm relatively new to Gmsh so please bare with me if I'm asking basic questions :-) <BR></DIV>
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<B><SPAN style="FONT-WEIGHT: bold">De :</SPAN></B> "Zenker, Dr. Matthias" <Matthias.Zenker@erbe-med.com><BR><B><SPAN style="FONT-WEIGHT: bold">À :</SPAN></B> Marc Secca <mksca220@yahoo.fr>; gmsh@geuz.org<BR><B><SPAN style="FONT-WEIGHT: bold">Envoyé le :</SPAN></B> Mar 29 mars 2011, 12h 47min 21s<BR><B><SPAN style="FONT-WEIGHT: bold">Objet :</SPAN></B> AW: [Gmsh] Mesh STEP file<BR></FONT><BR>
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<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN class=856514311-29032011>Hi Marc,</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN class=856514311-29032011></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN class=856514311-29032011>when I mesh your geometry (without defining physical groups) and open it with Elmerfem (<A href="http://www.csc.fi/elmer" rel=nofollow target=_blank>www.csc.fi/elmer</A>), I can see all surfaces as boundaries. So they must be in the msh file. The problem may be the way your cfd software reads the msh file.</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN class=856514311-29032011></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN class=856514311-29032011>HTH,</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN class=856514311-29032011></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN class=856514311-29032011>Matthias</SPAN></FONT></DIV>
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<P><SPAN lang=de><FONT size=2 face=Arial>----------------------------------------------------------------</FONT></SPAN> <BR><SPAN lang=de><FONT size=2 face=Arial>ERBE Elektromedizin GmbH</FONT></SPAN> <BR><SPAN lang=de><FONT size=2 face=Arial>Dr.rer.nat. Matthias Zenker</FONT></SPAN> <BR><SPAN lang=de><FONT size=2 face=Arial>Dipl. Phys.</FONT></SPAN> <BR><SPAN lang=de><FONT size=2 face=Arial>Grundlagenentwicklung / Fundamental Development</FONT></SPAN> <BR><SPAN lang=de><FONT size=2 face=Arial>Waldhoernlestrasse 17</FONT></SPAN> <BR><SPAN lang=de><FONT size=2 face=Arial>72072 Tuebingen</FONT></SPAN> <BR><SPAN lang=de><FONT size=2 face=Arial>Germany</FONT></SPAN> <BR><SPAN lang=de><FONT size=2 face=Arial>Phone + 49 (0) 7071 755 - 226</FONT></SPAN> <BR><SPAN lang=de><FONT size=2 face=Arial>Fax + 49 (0) 7071 755 - 5226</FONT></SPAN> <BR><SPAN lang=de><FONT size=2 face=Arial>E-Mail: <<A href="mailto:Matthias.Zenker@erbe-med.com" rel=nofollow target=_blank
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<FONT size=2 face=Tahoma><B>Von:</B> Marc Secca [mailto:mksca220@yahoo.fr] <BR><B>Gesendet:</B> Dienstag, 29. März 2011 12:57<BR><B>An:</B> gmsh@geuz.org<BR><B>Betreff:</B> [Gmsh] Mesh STEP file<BR></FONT><BR></DIV>
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<DIV>Hello!</DIV>
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<DIV>I am trying to mesh the attached STEP file in gmsh 2.4.2 and define boundaries for a cfd solver. I can merge the file and select the relevant surfaces and volume as physical groups but after I mesh to geometry, I open the .msh file created and cannot see the boundaries I defined. I tried saving the geometry as a .geo file but surfaces are missing at the pipe intersections.</DIV>
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<DIV>Is there a better way to do this? Can I repair the missing surfaces?</DIV>
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<DIV>Thanks for any help you can provide.</DIV>
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<DIV>Marc</DIV></DIV></DIV></DIV></DIV></DIV></DIV></DIV></DIV></DIV></DIV></div></body></html>