[Gmsh] Extrude 2D surface by rotating to create mesh - Openflower crashes

[Christophe Geuzaine]

Martin, Timothy J wrote:
> Thanks Dave
> 
> That has worked, however after some further reading I understand that GMSH cannot process the mesh inside a cone. 

why?

lc = 0.2;
Point(1) = {0,0,0,lc};
Point(2) = {1,0,0,lc};
Point(6) = {0,0,3,lc};
Line(1) = {1,2};
Line(2) = {2,6};
Line(3) = {6,1};
Line Loop(4) = {2,3,1};
Plane Surface(5) = {4};
Extrude {{0,0,1}, {0,0,0}, Pi/2} { Surface{5}; Layers{4}; Recombine; }
Extrude {{0,0,1}, {0,0,0}, Pi/2} { Surface{17}; Layers{4}; Recombine; }
Extrude {{0,0,1}, {0,0,0}, Pi/2} { Surface{29}; Layers{4}; Recombine; }
Extrude {{0,0,1}, {0,0,0}, Pi/2} { Surface{41}; Layers{4}; Recombine; }


> Is this likely to change any time soon?
> 
> Regards
> 
> Tim 
> 
> -----Original Message-----
> From: David Colignon [mailto:David.Colignon at ulg.ac.be] 
> Sent: 12 August 2008 14:51
> To: Martin, Timothy J
> Cc: gmsh at geuz.org
> Subject: Re: [Gmsh] Extrude 2D surface by rotating to create mesh - Openflower crashes
> 
> Hi Tim,
> 
> the Extrude command you try to use is deprecated, as indicated by the error message you mention:
> 
> line 34 : Explicit region numbers in layers are deprecated
> 
>  From the documentation:
> 
> http://geuz.org/gmsh/doc/texinfo/gmsh-full.html#SEC36
> 
> ...
> Please note that, starting with Gmsh 2.0, region numbers cannot be specified explicitly anymore in Layers commands. Instead, as with all other geometry commands, you must use the automatically created entity identifier created by the extrusion command. For example, the following extrusion command will return the id of the new "top" surface in num[0] and the id of the new volume in num[1]:
>   	
> num[] = Extrude {0,0,1} { Surface{1}; Layers{10}; }; ...
> 
> 
> You should modify your .geo file according to the new syntax:
> 
> http://geuz.org/gmsh/doc/texinfo/gmsh-full.html#SEC28
> and
> http://geuz.org/gmsh/doc/texinfo/gmsh-full.html#SEC36
> 
> , starting from
> 
> Extrude { { 0, 0, 1 }, { 0, 0, 0 }, 2*Pi/3 } { Surface { 12 }; Layers { 6 }; Recombine; }
> 
> instead of
> 
> Extrude Surface {12, {0,0,1}, {0,0,0}, 2*Pi/3} {Recombine ; Layers { 6, 54, 1 } ; } ;
> 
> Cheers,
> 
> Dave
> 
> --
> David Colignon, Ph.D.
> Collaborateur Logistique du F.R.S.-FNRS (Équipements de Calcul Intensif) ACE - Applied & Computational Electromagnetics Institut Montefiore B28 Université de Liège 4000 Liège - BELGIQUE
> Tél: +32 (0)4 366 37 32
> Fax: +32 (0)4 366 29 10
> WWW:    http://hpc.montefiore.ulg.ac.be/
> Agenda: http://www.google.com/calendar/embed?src=david.colignon%40gmail.com
> 
> 
> 
> Martin, Timothy J wrote:
>> Hi!
>>
>> I am trying to extrude a surface by rotating it, then process the 3D 
>> mesh in openflower.
>> Extruding seems to create some errors - line 34 : Explicit region 
>> numbers in layers are deprecated
>> I can then generate a 3d mesh, but there is one error - Cannot 
>> tetrahedralize volume with quadrangles on boundary
>> Openflower crashes when trying to run the .flw file.
>>
>> I have copied the following code, but don't understand where to get the 
>> numbers from in the layers expression - Layers { 6, 54, 1 } could this 
>> be the problem?
>>
>> Extrude Surface {12, {0,0,1}, {0,0,0}, 2*Pi/3} {
>>   Recombine ; Layers { 6, 54, 1 } ;
>> } ;
>>
>> Extrude Surface {64, {0,0,1}, {0,0,0}, 2*Pi/3} {
>>   Recombine ; Layers { 6, 311, 1 } ;
>> } ;
>>
>> Extrude Surface {116, {0,0,1}, {0,0,0}, 2*Pi/3} {
>>   Recombine ; Layers { 6, 568, 1 } ;
>> } ;
>>
>>
>> .geo .flw and GMSH error log attached.
>> <<die2.flw>> <<die2.geo>> <<GMSH error.txt>>
>> Many thanks!!
>>
>> *Tim Martin*
>>
>>
>>
>> ------------------------------------------------------------------------
>>
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>> gmsh at geuz.org
>> http://www.geuz.org/mailman/listinfo/gmsh
> 
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> 


-- 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science
http://www.montefiore.ulg.ac.be/~geuzaine