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<p>Hi Guillaume,</p>
<p>thanks for the quick reply.</p>
<p>I realized soon after sending my email that I did not attach a
MWE. I was waiting for the email to appear on the mailing so that
I could reply to myself on that one, but it took some time... It's
attached now.</p>
<p>I managed to get it done by using fields *and* setting
Mesh.CharacteristicLengthExtendFromBoundary to 0 -- see result in
attached PNG.<br>
</p>
<p>Regarding your ideas:</p>
<p>1) I'm really trying to mesh a disk shape.</p>
<p>2) If there's an easier way to do it, great. I tried the
characteristic length scale approach as well -- see attached MWE
-- but that didn't work well. Either the inner part is completely
meshed with small entities, or the result is very weird.</p>
<p>3) I did not know about the Line in Surface command. Will try
that one, too.</p>
<p>Best,</p>
<p>Matthias<br>
</p>
<br>
<div class="moz-cite-prefix">On 06/19/2017 05:10 PM, DILASSER
Guillaume wrote:<br>
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<div class="WordSection1">
<p class="MsoPlainText">Hi Matthias,<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><span lang="EN-US">It would have been
nice to see the script file you are working on to better
identify the error, nevertheless here are a few questions :<o:p></o:p></span></p>
<p class="MsoPlainText"
style="margin-left:36.0pt;text-indent:-18.0pt;mso-list:l0
level1 lfo1">
<!--[if !supportLists]--><span style="font-family:Symbol"
lang="EN-US"><span style="mso-list:Ignore">·<span
style="font:7.0pt "Times New Roman"">
</span></span></span><!--[endif]--><span lang="EN-US">Are
you trying to mesh a disk or a donut shape ? In the latter
case, did you properly define the hole in the surface (see
Plane Surface
<a moz-do-not-send="true"
href="http://gmsh.info/doc/texinfo/gmsh.html#Surfaces">here</a>)?<o:p></o:p></span></p>
<p class="MsoPlainText"
style="margin-left:36.0pt;text-indent:-18.0pt;mso-list:l0
level1 lfo1">
<!--[if !supportLists]--><span style="font-family:Symbol"
lang="EN-US"><span style="mso-list:Ignore">·<span
style="font:7.0pt "Times New Roman"">
</span></span></span><!--[endif]--><span lang="EN-US">Do
you really need fields to control your mesh density ? Using
point characteristic lengths (see Point
<a moz-do-not-send="true"
href="http://gmsh.info/doc/texinfo/gmsh.html#Points">here</a>)
may be enough and far easier to implement.<o:p></o:p></span></p>
<p class="MsoPlainText"
style="margin-left:36.0pt;text-indent:-18.0pt;mso-list:l0
level1 lfo1">
<!--[if !supportLists]--><span style="font-family:Symbol"
lang="EN-US"><span style="mso-list:Ignore">·<span
style="font:7.0pt "Times New Roman"">
</span></span></span><!--[endif]--><span lang="EN-US">If
you want to mesh a disk, you will want to embed the inner
circle in the disk defined by the outer one using the Line
in Surface command (see
<a moz-do-not-send="true"
href="http://gmsh.info/doc/texinfo/gmsh.html#Miscellaneous-mesh-commands">here</a>).<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">Did it help ? Let me
know if you still have questions,<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span
style="font-family:"Tahoma",sans-serif;color:#000099;mso-fareast-language:FR">Guillaume
DILASSER</span><span
style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:#000099;mso-fareast-language:FR"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#000099;mso-fareast-language:FR">Doctorant
SACM / LEAS<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#000099;mso-fareast-language:FR">CEA
- Centre de Saclay - Bât.123 - PC 319c</span><span
style="color:#000099;mso-fareast-language:FR"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#000099;mso-fareast-language:FR">91191
Gif sur Yvette Cedex - France -</span><span
style="color:#000099;mso-fareast-language:FR"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#000099;mso-fareast-language:FR"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#000099;mso-fareast-language:FR"><a
moz-do-not-send="true"
href="mailto:guillaume.dilasser@cea.fr"><span
style="color:blue">guillaume.dilasser@cea.fr</span></a><o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span style="mso-fareast-language:FR">-----Message
d'origine-----<br>
De : gmsh [<a class="moz-txt-link-freetext" href="mailto:gmsh-bounces@ace20.montefiore.ulg.ac.be">mailto:gmsh-bounces@ace20.montefiore.ulg.ac.be</a>]
De la part de Matthias Sitte<br>
Envoyé : lundi 19 juin 2017 13:18<br>
À : <a class="moz-txt-link-abbreviated" href="mailto:gmsh@onelab.info">gmsh@onelab.info</a><br>
Objet : [Gmsh] refining the mesh of a circle with Attractor
Fields</span></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Hi all,<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">I'm trying to set up the following
problem:<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">1) Create a circular geometry with
radius R_outer using 4 Circles and a Line Loop which defines
the outer boundary of the mesh.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">2) Create another closed circle (again
made out of 4 Circles) with radius R_inner inside the circular
mesh.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">3) Goal is to reduce lchar and create a
finer mesh close the inner circle, but keep the coarser mesh
everywhere else.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">So far I've started from the example
t10.geo and mostly got what I wanted. But I observed that if I
close the inner circle, all of the mesh within the circle is
meshed with reduced lchar, not the lchar I would've expected.
When I open the circle by leaving out segment(s), the result
looks better w.r.t. mesh size, but it's of course not what I
want. Am I missing something here?<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Best,<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Matthias<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">_______________________________________________<o:p></o:p></p>
<p class="MsoPlainText">gmsh mailing list<o:p></o:p></p>
<p class="MsoPlainText"><a moz-do-not-send="true"
href="mailto:gmsh@onelab.info"><span
style="color:windowtext;text-decoration:none">gmsh@onelab.info</span></a><o:p></o:p></p>
<p class="MsoPlainText"><a moz-do-not-send="true"
href="http://onelab.info/mailman/listinfo/gmsh"><span
style="color:windowtext;text-decoration:none">http://onelab.info/mailman/listinfo/gmsh</span></a><o:p></o:p></p>
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