[Gmsh] Message receive it on messages window ....
Christophe Geuzaine
geuzaine at acm.caltech.edu
Wed May 28 05:52:19 CEST 2003
Catalin Bondrea wrote:
> Dear GMSH users,
> In the last time I don't work with GMSH program, but since today (27 May 2003) I come back to finish an old problem.
>
> This it was the answer for my last request:
> "
> Catalin - did you check tutorial/t5.geo? The usual way to create a
> volume with holes in gmsh is to
>
> - define the surface loops for the holes
> - define the exterior surface loop
> - define the exterior volume (the air) as a list of these surface loops,
> the first one being the exterior loop
> "
> Notations:
> i* means that is a point, when i is a number indicating the number of the point.
> i means the volume number
>
> Fig.1 Fig.2
> |----------------| 1*|----------------|*7
> | |----| | | 3*|----|*5 |
> | | 2 | | | | 2 | |
> | | | | | | | |
> | |----| | | 4*|----|*6 |
> | 1 | | 1 |
> |----------------| 2*|----------------|*8
>
> Fig.3
> |----------------|
> | |
> |----| |
> | 4 | |
> | | |
> |----| |
> | 3 |
> | |
> |----------------|
>
> We have two figures:
> In fig.1 we have two volumes 1 and 2
> In fig.2 we have two volumes 3 and 4
> If we try to do this in gmsh, in fig.2 it's more or less easy to implement. We have like in fig.2 8 points.
> What we do when we want to draw the fig.3. The problem is with sharing one lines, that means when we want to draw
> the fig.3 we need to modify in this way:
> Fig.4
> 1*|--------------|*7
> | |
> 2*|----|*5 |
> | 4 | |
> | | |
> 3*|----|*6 |
> | 3 |
> | |
> 4*|--------------|*8
>
> From point 2* to 1* in fig.2 is one line.
> From point 4* to 1* in fig.4 we have 3 lines.
> And the line between 3* to 2* is a line with appear in volume 3 and also in volume 4.
>
> More or less I have one more complicated geo file for what I want to draw.
> If I create the bigger volume like in fig 2 I DON'T HAVE PROBLEMS.
> if I try like in fig.4 I have problems like: Warning: Volumes has changed (some numbers -> some numbers)
> and like don't want to finish showing all this messages.
>
> The question: What is to do in this case?
>
In that case the topology is different: you *don't* have any holes
anymore. The first surface is simply defined by the lines joining the
points 1,2,5,6,3,4,8,7 and the second surface by the lines joining the
points 2,3,6,5...
Christophe
--
Christophe Geuzaine
Tel: (626) 395-4552 http://www.geuz.org
Fax: (626) 578-0124 mailto:geuzaine at acm.caltech.edu