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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>
<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>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/">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">mailto:Matthias.Zenker@erbe-med.com</A>></FONT></SPAN>
<BR><SPAN lang=de><FONT size=2 face=Arial>URL: <A
href="http://www.erbe-med.com/">http://www.ERBE-med.com</A></FONT></SPAN>
<BR><SPAN lang=de><FONT size=2
face=Arial>----------------------------------------------------------------</FONT></SPAN>
</DIV>
<DIV> </DIV><BR>
<DIV dir=ltr lang=de class=OutlookMessageHeader align=left>
<HR tabIndex=-1>
<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>
<DIV></DIV>
<DIV
style="FONT-FAMILY: times new roman, new york, times, serif; FONT-SIZE: 12pt">
<DIV><BR></DIV>
<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>
<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">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>
<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!</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>
<DIV
style="FONT-FAMILY: times new roman, new york, times, serif; FONT-SIZE: 12pt"><FONT
size=2 face=Tahoma>
<HR SIZE=1>
<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>
<DIV> </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
ymailto="mailto:Matthias.Zenker@erbe-med.com">mailto:Matthias.Zenker@erbe-med.com</A>></FONT></SPAN>
<BR><SPAN lang=de><FONT size=2 face=Arial>URL: <A
href="http://www.erbe-med.com/" rel=nofollow
target=_blank>http://www.ERBE-med.com</A></FONT></SPAN> <BR><SPAN lang=de><FONT
size=2
face=Arial>----------------------------------------------------------------</FONT></SPAN>
</P>
<DIV> </DIV><BR>
<DIV dir=ltr lang=de class=OutlookMessageHeader align=left>
<HR tabIndex=-1>
<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>
<DIV></DIV>
<DIV
style="FONT-FAMILY: times new roman, new york, times, serif; FONT-SIZE: 12pt">
<DIV>Hello!</DIV>
<DIV> </DIV>
<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>
<DIV> </DIV>
<DIV>Is there a better way to do this? Can I repair the missing surfaces?</DIV>
<DIV> </DIV>
<DIV>Thanks for any help you can provide.</DIV>
<DIV> </DIV>
<DIV>Marc</DIV></DIV></DIV></DIV></BODY></HTML>