[Gmsh] Characteristic Length
Christophe Geuzaine
cgeuzaine at ulg.ac.be
Tue Mar 25 10:20:44 CET 2008
Jehanzeb Hameed wrote:
> >With a char length of 0.5, you should get (about) 4 division per side
> of your square (4*0.5=2, which is the length of one side of the square).
>
> Actually, I get 3 divisions per side (with length of each side being
> .666). This is whats confusing me about characteristic length. How is
> the "about" factor decided?
It's up to numerical errors: computing the divisions on the lines
involves numerical integration. Try e.g. replacing lc=0.5 by lc=0.499.
> And how will the radius of the circumscribed
> circles be determined ?
>
> Thanks,
> -Jehanzeb
>
>
> On Fri, Mar 21, 2008 at 12:18 PM, Christophe Geuzaine
> <cgeuzaine at ulg.ac.be <mailto:cgeuzaine at ulg.ac.be>> wrote:
>
> Jehanzeb Hameed wrote:
> > Hi,
> >
> > I cant understand how "Characteristic Length" works in gmsh. I
> specify 4
> > points (which are corner of a square, bottom left = (-1,-1) , top
> right
> > = (1,1) ). The points have characteristic length 0.5 . I mesh this
> > domain. I cant figure out what the relationship between radius of the
> > circumscribed circle and characteristic length is. The documentation
> > says this:
> >
> > "The size of the mesh elements will then be computed by linearly
> > interpolating these characteristic lengths on the initial mesh".
> >
> > I cant understand between what values is the size of the mesh
> elements
> > being interpolated. How can I find this out?
>
>
> With a char length of 0.5, you should get (about) 4 division per side of
> your square (4*0.5=2, which is the length of one side of the square).
>
>
>
>
> >
> > Thanks,
> > -Jehanzeb
> >
> >
> >
> >
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>
> --
> Prof. Christophe Geuzaine
> University of Liege, Electrical Engineering and Computer Science
> http://www.montefiore.ulg.ac.be/~geuzaine
> <http://www.montefiore.ulg.ac.be/%7Egeuzaine>
>
>
>
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Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science
http://www.montefiore.ulg.ac.be/~geuzaine