[scilab-Users] Volume calculation from closed meshed surface

[Carrico, Paul]

not easy to explain ...
 
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) !
 
Have a look in the attached document pages 20 and 25 for some examples !!!!
 
Paul
 
________________________________

De : Samuel GOUGEON [mailto:Samuel.Gougeon at univ-lemans.fr] 
Envoyé : mercredi 8 juin 2011 14:36
À : users at lists.scilab.org
Objet : Re: [scilab-Users] Volume calculation from closed meshed surface


----- Message d'origine ----- 
De : Carrico, Paul 
Date : 08/06/2011 14:23: 

	Dear Samuel,
	 
	- The type of facets are either triangles or quads (or both for a mesh using mixed elements),
	- the type of interpolation can be either linear or quadratic where some nodes traduces the curvature .... (for mechanical FEA) 
	- coordinate system => cartesian one
	- kind of shape : has a torus to be treated different than a simple sphere ?
	 
	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 ?
	

Since you want to work on volumes, you need tetrahedrons instead of triangles,
or hexahedrons instead of quads. AFAIK, there is no universal strategy. 
It depends of the topology of the volume (concave/convex, simply or doubly 
connexe..). It is not a simple problem.

SG



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