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<DIV dir=ltr lang=fr class=OutlookMessageHeader align=left><SPAN
class=275013912-08062011><FONT color=#0000ff size=2 face=Arial>not easy to
explain ...</FONT></SPAN></DIV>
<DIV dir=ltr lang=fr class=OutlookMessageHeader align=left><SPAN
class=275013912-08062011><FONT color=#0000ff size=2
face=Arial></FONT></SPAN> </DIV>
<DIV dir=ltr lang=fr class=OutlookMessageHeader align=left><SPAN
class=275013912-08062011><FONT color=#0000ff size=2 face=Arial>imagine that
whatever is the shape (let me choosing a shere in the current email), only the
outer surface is meshed ... directly I don't want to perform a fea on that part
=> I just want to know the inner volume (in reality to estimate the inner
pressure following the shape changes) !</FONT></SPAN></DIV>
<DIV dir=ltr lang=fr class=OutlookMessageHeader align=left><SPAN
class=275013912-08062011><FONT color=#0000ff size=2
face=Arial></FONT></SPAN> </DIV>
<DIV dir=ltr lang=fr class=OutlookMessageHeader align=left><SPAN
class=275013912-08062011><FONT color=#0000ff size=2 face=Arial>Have a look in
the attached document pages 20 and 25 for some examples !!!!</FONT></SPAN></DIV>
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class=275013912-08062011><FONT color=#0000ff size=2
face=Arial></FONT></SPAN> </DIV>
<DIV dir=ltr lang=fr class=OutlookMessageHeader align=left><SPAN
class=275013912-08062011><FONT color=#0000ff size=2
face=Arial>Paul</FONT></SPAN></DIV>
<DIV dir=ltr lang=fr class=OutlookMessageHeader align=left><SPAN
class=275013912-08062011> </SPAN></DIV>
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<DIV dir=ltr lang=fr class=OutlookMessageHeader align=left><FONT size=2
face=Tahoma><B>De :</B> Samuel GOUGEON
[mailto:Samuel.Gougeon@univ-lemans.fr] <BR><B>Envoyé :</B> mercredi 8 juin
2011 14:36<BR><B>À :</B> users@lists.scilab.org<BR><B>Objet :</B> Re:
[scilab-Users] Volume calculation from closed meshed
surface<BR></FONT><BR></DIV>
<DIV></DIV>----- Message d'origine ----- <BR>De : Carrico, Paul <BR>Date :
08/06/2011 14:23:
<BLOCKQUOTE cite=mid:55A12CBC06A8C9459DCE0BBEF8122FDC0498B370@exchsrv.AUXITROL1
type="cite">
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<DIV><FONT color=#0000ff size=2 face=Arial><SPAN class=314151512-08062011>Dear
Samuel,</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff size=2 face=Arial><SPAN
class=314151512-08062011></SPAN></FONT> </DIV>
<DIV><FONT color=#0000ff size=2 face=Arial><SPAN class=314151512-08062011>-
The type of facets are either triangles or quads (or both for a mesh using
mixed elements),</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff size=2 face=Arial><SPAN class=314151512-08062011>-
the type of interpolation can be either linear or quadratic where some nodes
traduces the curvature .... (for mechanical FEA) </SPAN></FONT></DIV>
<DIV><FONT color=#0000ff size=2 face=Arial><SPAN class=314151512-08062011>-
coordinate system => cartesian one</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff size=2 face=Arial><SPAN class=314151512-08062011>-
kind of shape : has a torus to be treated different than a simple sphere
?</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff size=2 face=Arial><SPAN
class=314151512-08062011></SPAN></FONT> </DIV>
<DIV><FONT color=#0000ff size=2 face=Arial><SPAN class=314151512-08062011>I
have some information's on closed surfaces using triangles ... of course a
solution is to "split" all the elements into 3 nodes triangles ... but is it
the simpliest way ? the most robust one ?</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff size=2 face=Arial><SPAN
class=314151512-08062011></SPAN></FONT></DIV></BLOCKQUOTE>Since you want to work
on volumes, you need tetrahedrons instead of triangles,<BR>or hexahedrons
instead of quads. AFAIK, there is no universal strategy. <BR>It depends of the
topology of the volume (concave/convex, simply or doubly <BR>connexe..). It is
not a simple problem.<BR><BR>SG<BR><BR></BODY></HTML>
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