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<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><FONT color=#000000><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'">Monsieur,</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'"><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></SPAN></FONT></P>
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<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'"><FONT color=#000000>Je me permets de vous envoyer ce mail car j'utilise GMSH dans le cadre de ma thèse (ULB) et j'ai quelques problèmes au niveau du maillage de ma géométrie. Celle-ci est représentée à la figure geometrie.pdf (ci-jointe)<o:p></o:p></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'"><o:p><FONT color=#000000> </FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><FONT color=#000000><B><I><U><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'">Contexte :</SPAN></U></I></B><B><I><U><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'"><o:p></o:p></SPAN></U></I></B></FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'"><FONT color=#000000>Domaine est composé de 2 surfaces. Dans mon cas, la frontière supérieure (point 7 jusqu'au point 9 = cercle 1007) et spécialement le voisinage du point 9 est critique. Très proche de ce dernier point, il y a un autre point (point 9) qui joint le point 12 ---> cercle1004. <o:p></o:p></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'"><o:p><FONT color=#000000> </FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><FONT color=#000000><B><I><U><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'">Maillage : </SPAN></U></I></B><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'">j'ai testé différents maillages et, comme vous pouvez le constater sur les différentes figures, je rencontre quelques problèmes.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'"><o:p><FONT color=#000000> </FONT></o:p></SPAN></P>
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<LI class=MsoNormal style="MARGIN: 0cm 0cm 0pt; mso-list: l0 level1 lfo1; tab-stops: 36.0pt"><FONT color=#000000><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'">Maillage uniforme (figure MaillageUniforme.pdf): longueur caractéristique de l'ordre de 1e-4, tout est normal. Dans mon cas, je dois raffiner fortement au point 9</SPAN></FONT></LI>
<LI class=MsoNormal style="MARGIN: 0cm 0cm 0pt; mso-list: l0 level1 lfo1; tab-stops: 36.0pt"><FONT color=#000000><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'">Maillage uniforme (longueur caractéristique de l'ordre de 1e-4) avec raffinement au point 9 (longueur caractéristique = 1e-12) : figures MaillageRaffinement1.pdf et MaillageRaffinement1_Zoom.pfg. </SPAN><B><U><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'">Premier problème : </SPAN></U></B><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'">vous pouvez constater sur cette dernière figure que le raffinement n'a pas lieu vers le point 12 : POURQUOI ? </SPAN></FONT></LI></OL>
<DIV class=MsoNormal style="MARGIN: 0cm 0cm 0pt; mso-list: l0 level1 lfo1; tab-stops: 36.0pt"><FONT color=#000000><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'"></SPAN></FONT><FONT color=#000000><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'"> Ce maillage n'est pas suffisant pour la résolution de mon problème, j'ai donc imposé des longueurs caractéristiques </SPAN></FONT></DIV>
<DIV class=MsoNormal style="MARGIN: 0cm 0cm 0pt; mso-list: l0 level1 lfo1; tab-stops: 36.0pt"><FONT color=#000000><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'"> différentes selon les points (maillage non uniforme)</SPAN></FONT></DIV>
<DIV class=MsoNormal style="MARGIN: 0cm 0cm 0pt; mso-list: l0 level1 lfo1; tab-stops: 36.0pt"><FONT color=#000000><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'"></SPAN></FONT> </DIV>
<OL style="MARGIN-TOP: 0cm" type=1 start=3>
<LI class=MsoNormal style="MARGIN: 0cm 0cm 0pt; mso-list: l0 level1 lfo1; tab-stops: 36.0pt"><FONT color=#000000><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'">Maillage non uniforme : figures MaillageRaffinement2.pdf et MaillageRaffinement2_Zoom.pfg. </SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'"><o:p></o:p></SPAN></FONT></LI></OL>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt 36pt"><FONT color=#000000><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'">Je ne sais pas si cela peut vous aider, mais voici les différentes longueurs caractéristiques des différents point (lg_i avec i le numéro du point) :</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'"><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt 72pt"><FONT color=#000000><SPAN lang=EN-GB style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'; mso-ansi-language: EN-GB">lc1 = 0.5D0*DiaExt*angle/12.0D0</SPAN><SPAN lang=EN-GB style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'; mso-ansi-language: EN-GB"><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt 72pt"><SPAN lang=EN-GB style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'; mso-ansi-language: EN-GB"><o:p><FONT color=#000000> </FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt 72pt"><FONT color=#000000><SPAN lang=EN-GB style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'; mso-ansi-language: EN-GB">lg1<SPAN style="mso-spacerun: yes"> </SPAN>= lc1</SPAN><SPAN lang=EN-GB style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'; mso-ansi-language: EN-GB"><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt 72pt"><FONT color=#000000><SPAN lang=EN-GB style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'; mso-ansi-language: EN-GB">lg2<SPAN style="mso-spacerun: yes"> </SPAN>= lc1</SPAN><SPAN lang=EN-GB style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'; mso-ansi-language: EN-GB"><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt 72pt"><FONT color=#000000><SPAN lang=EN-GB style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'; mso-ansi-language: EN-GB">lg3<SPAN style="mso-spacerun: yes"> </SPAN>= lc1</SPAN><SPAN lang=EN-GB style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'; mso-ansi-language: EN-GB"><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt 72pt"><FONT color=#000000><SPAN lang=EN-GB style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'; mso-ansi-language: EN-GB">lg5<SPAN style="mso-spacerun: yes"> </SPAN>= lc1</SPAN><SPAN lang=EN-GB style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'; mso-ansi-language: EN-GB"><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt 72pt"><FONT color=#000000><SPAN lang=EN-GB style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'; mso-ansi-language: EN-GB">lg6<SPAN style="mso-spacerun: yes"> </SPAN>= 0.625D0*lc1</SPAN><SPAN lang=EN-GB style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'; mso-ansi-language: EN-GB"><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt 72pt"><FONT color=#000000><SPAN lang=EN-GB style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'; mso-ansi-language: EN-GB">lg7<SPAN style="mso-spacerun: yes"> </SPAN>= 0.75D0*lc1</SPAN><SPAN lang=EN-GB style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'; mso-ansi-language: EN-GB"><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt 72pt"><FONT color=#000000><SPAN lang=EN-GB style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'; mso-ansi-language: EN-GB">lg8<SPAN style="mso-spacerun: yes"> </SPAN>= lc1</SPAN><SPAN lang=EN-GB style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'; mso-ansi-language: EN-GB"><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt 72pt"><FONT color=#000000><SPAN lang=EN-GB style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'; mso-ansi-language: EN-GB">lg9<SPAN style="mso-spacerun: yes"> </SPAN>= 1.0e-12</SPAN><SPAN lang=EN-GB style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'; mso-ansi-language: EN-GB"><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt 72pt"><FONT color=#000000><SPAN lang=EN-GB style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'; mso-ansi-language: EN-GB">lg10 = 0.625D0*lc1</SPAN><SPAN lang=EN-GB style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'; mso-ansi-language: EN-GB"><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt 72pt"><FONT color=#000000><SPAN lang=EN-GB style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'; mso-ansi-language: EN-GB">lg11 = lc1</SPAN><SPAN lang=EN-GB style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'; mso-ansi-language: EN-GB"><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt 72pt"><FONT color=#000000><SPAN lang=EN-GB style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'; mso-ansi-language: EN-GB">lg12 = 0.1D0*lc1</SPAN><SPAN lang=EN-GB style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'; mso-ansi-language: EN-GB"><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt 72pt"><FONT color=#000000><SPAN lang=EN-GB style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'; mso-ansi-language: EN-GB">lg13 = lc1</SPAN><SPAN lang=EN-GB style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'; mso-ansi-language: EN-GB"><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt 72pt"><FONT color=#000000><SPAN lang=EN-GB style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'; mso-ansi-language: EN-GB">lg14 = 0.1D0*lc1</SPAN><SPAN lang=EN-GB style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'; mso-ansi-language: EN-GB"><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt 72pt"><FONT color=#000000><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'">lg15 = lc1</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'"><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt 72pt"><FONT color=#000000><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'">lg16 = lc1</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'"><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt 36pt"><FONT color=#000000><B><U><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'">Second problème</SPAN></U></B><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'"> : Comme vous pouvez le constater j'ai un problème au niveau du maillage (MaillageRaffinement2.pdf ). En effet, GMSH raffine bien aux points demandés par contre, il grossit fortement les mailles entre les points 6 et 11 (qui est le centre du cercle 1032) et raffine la frontière droite.<SPAN style="mso-spacerun: yes"> </SPAN>Je vous ai également mis un zoom du coin supérieur droit (MaillageRaffinement2_Zoom.pfg). Pourriez-vous m'aider à comprendre pourquoi j'ai un tel maillage ? </SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'"><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt 36pt"><FONT color=#000000><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'">Les figures MaillageRaffinement3.pdf et MaillageRaffinement4.pdf sont également des profils pour des maillages non uniformes mais avec des longueurs caractéristiques différentes (variation de lc1). On peut également y observer le problème de maillage au niveau du point 11. </SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'"><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'"><o:p><FONT color=#000000> </FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><FONT color=#000000><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'">J'ai également essayé d'utiliser la commande « Attractor Point » pour le point 11. Lorsque je définis cet attracteur, j'observe un raffinement de toutes mes frontières ! Je présume que le problème vient du fait que, comme je suis en « Triangle 2D Algorithm » et non en « Anistropic 2D Algorithm » la commande n'est pas valable.</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'"><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'"><o:p><FONT color=#000000> </FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><FONT color=#000000><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'">D'avance je vous remercie,</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'"><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'"><FONT color=#000000>Séverine Rossomme </FONT></SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 'Times New Roman'"><o:p></o:p></SPAN></P></TD></TR>
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