<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 14 (filtered medium)"><style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Verdana;
panose-1:2 11 6 4 3 5 4 4 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Calibri","sans-serif";
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;
font-family:"Calibri","sans-serif";}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black;background:#F7F7F7'>Hi,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black;background:#F7F7F7'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black;background:#F7F7F7'>I've encountered a problem for a design I'm trying to mesh with Gmsh. Basically, the issue is in a solid that looks like a hollow cone; the wall cone is very thin (the thickness of the wall is 0.1, while the top diameter of the cone is 10, and the bottom is 6; height is 14). The issue seems to be with the 2D meshing of the outer and inner cone surfaces: some of the triangles from the outer surface intersect some triangles on the inner surface.</span><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black'><br><br><span style='background:#F7F7F7'>This design is supposed to be simulated a lot of times with slight variations, so I'd like to get a small mesh that's amenable to quick simulations. In my experiments so far a mesh of about 100K elements with a meshing time of 45s is good.</span><br><br><span style='background:#F7F7F7'>I can change Mesh.MinimumCirclePoints in the .geo file, but if I set it high enough to avoid the issue, meshing takes 4 minutes and results in 800k mesh elements. I can also change the characteristic length (either for the entire design or just a box around this solid), but the result is again a large mesh and very slow meshing.</span><br><br><span style='background:#F7F7F7'>Is there a way to avoid the issue of intersecting triangles while avoid a big penalty in speed/size?</span><br><br><span style='background:#F7F7F7'>Thanks.</span><br><span style='background:#F7F7F7'>Tibi</span></span><o:p></o:p></p></div></body></html>