[Gmsh] 2D structured mesh - surface with curve lines

[Christophe Geuzaine]

Pei-Ying Hsieh wrote:
> 
> Dear GMSH users:
> 
> I am trying to mesh a 2D surface (consists of 2 straight lines and 2 
> curcular arc) using structred mesh (will be all Quad).  There is no 
> problem if all 4 sides (lines) are striaght lines.  But, circular arc 
> seems to be a problem.  Is there a way to do this?  Thanks a lot if you 
> can take a look at this!
> 
> Pei
> -----------------------------------------
> lc = 0.2;
> Point(4) = {0, 1, 0, lc};
> Point(5) = {0, 0, 0, lc};
> Point(6) = {-1, 0, 0, lc};
> Point(7) = {-2, 0, 0, lc};
> Point(8) = {0, 2, 0, lc};
> Line (7) = {8, 4};
> Line (8) = {6, 7};
> Circle (9) = {7, 5, 8};
> Circle (10) = {4, 5, 6};
> Line Loop(11) = {7, 10, 8, 9};
> Plane Surface(12) = {11};
> Transfinite Line{7:10} = 6;
> Transfinite Surface{12} = {7, 10, 8, 9};

Hi Pei - The last line should be:

Transfinite Surface{12} = {7, 6, 4, 8};

(Transfinite surfaces are defined in terms of vertices, not bounding
curves.)

> Recombine Surface {12};
> 
> /
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-- 
Christophe Geuzaine
Assistant Professor, Case Western Reserve University, Mathematics
http://www.case.edu/artsci/math/geuzaine