[Gmsh] Mapped meshing

[Christophe Geuzaine]

Atanas Pavlov wrote:
> Hello,
> 
> I am trying to create a mesh for an axisymmetric geometry, which is 
> relatively simple, defined by a few points, resp curves connecting them. 
> I would like, however, to perform mapped meshing where I partition the 
> curves, then use these partitions on 4-side surface regions to partition 
> the regions, and then revolve-extrude the mesh around the symmetry axis. 
> As far as I can see, the first step is currently not possible in GMSH, 
> because for surface mesh it can only generate triangle mesh (or extrude 
> 1D mesh, which however is not possible in this case). Is there any 
> workaround? Is mapped meshing planned to be implemented in GMSH, and for 
> simple cases like that, can it be a short term feasible task?
> 

Could you use a Transfinite grid like this?

Point(1) = {0,0,0,0.1};
Point(2) = {1,0,0,0.1};
Point(3) = {0,1,0,0.1};
Point(4) = {3,0,0,0.1};
Point(5) = {3,3,0,0.1};
Point(6) = {0,3,0,0.1};
Line(1) = {3,6};
Line(2) = {6,5};
Line(3) = {5,4};
Line(4) = {4,2};
Circle(5) = {2,1,3};
Line Loop(6) = {3,4,5,1,2};
Plane Surface(7) = {6};
Transfinite Line {1} = 20 Using Progression 1.2;
Transfinite Line {4} = 20 Using Progression 1./1.2;
Transfinite Line {3,2} = 10 Using Progression 1;
Transfinite Line {5} = 19 Using Progression 1;
Transfinite Surface {7} = {3,6,4,2} Alternated;
Recombine Surface {7};



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