[Gmsh] Segmentation fault upon meshing small surface

[Oliver]

Found it: the line loop 35 is not fully closed. Strangely, gmsh does not
report an error there (bug?). It is missing Line 28.

I've found a difference between the two gmsh versions though upon meshing,
which I'll report in another topic.


2014-07-07 9:57 GMT+02:00 Oliver <oliver.willekens at gmail.com>:

> I have a rather simple 2D mesh, for which I'm getting a segmentation fault
> upon meshing.
>
> I have tried meshing it after starting from the unrolled geometry and I
> have tried meshing it with gmsh versions 2.5.1 (default under ubuntu 12.04)
> and 2.8.4 (installed last week, to see if I could successfully mesh it with
> a more modern version).
>
> I notice one odd thing about the mesh: if I plot the surface numbers and
> surfaces (the "crosses"), then the surface number (35) is not at all in the
> center of the area. I'm not sure if it is related or if its position is
> merely calculated based on the density of nodes.
>
> The segmentation fault seems to occur at the same time when it is meshing
> surface 35 (something that became apparent using the older gmsh version).
>
> Please find below the unrolled geometry. Can you provide any insights into
> why I'm getting this error? It's the first time I'm getting segmentation
> faults from gmsh, and I've been using it for about 2 years now...
> I can also add the actual geometry file (which uses Extrusions,
> Translations and For loops), but I don't think it's relevant. Let me know
> though...
>
> cl__1 = 1;
> Point(1) = {0, 0, 0, cl__1};
> Point(2) = {10, 0, 0, cl__1};
> Point(3) = {15, 0, 0, cl__1};
> Point(5) = {25, 0, 0, cl__1};
> Point(9) = {30, 0, 0, cl__1};
> Point(11) = {40, 0, 0, cl__1};
> Point(15) = {45, 0, 0, cl__1};
> Point(17) = {55, 0, 0, cl__1};
> Point(21) = {60, 0, 0, cl__1};
> Point(23) = {70, 0, 0, cl__1};
> Point(27) = {75, 0, 0, cl__1};
> Point(29) = {85, 0, 0, cl__1};
> Point(33) = {90, 0, 0, cl__1};
> Point(35) = {100, 0, 0, cl__1};
> Point(39) = {105, 0, 0, cl__1};
> Point(41) = {115, 0, 0, cl__1};
> Point(45) = {125, 0, 0, cl__1};
> Point(46) = {-40, 0, -50, cl__1};
> Point(47) = {125, 0, -50, cl__1};
> Point(48) = {-40, 0, 0.5, cl__1};
> Point(49) = {125, 0, 0.5, cl__1};
> Point(50) = {-40, 0, 1.3, cl__1};
> Point(51) = {125, 0, 1.3, cl__1};
> Point(52) = {-40, 0, 11.3, cl__1};
> Point(53) = {125, 0, 11.3, cl__1};
> Point(54) = {-40, 0, 0, cl__1};
> Line(1) = {1, 2};
> Line(2) = {2, 3};
> Line(3) = {3, 5};
> Line(4) = {5, 9};
> Line(5) = {9, 11};
> Line(6) = {11, 15};
> Line(7) = {15, 17};
> Line(8) = {17, 21};
> Line(9) = {21, 23};
> Line(10) = {23, 27};
> Line(11) = {27, 29};
> Line(12) = {29, 33};
> Line(13) = {33, 35};
> Line(14) = {35, 39};
> Line(15) = {39, 41};
> Line(16) = {41, 45};
> Line(17) = {46, 47};
> Line(18) = {48, 49};
> Line(19) = {50, 51};
> Line(20) = {48, 50};
> Line(21) = {49, 51};
> Line(23) = {52, 53};
> Line(24) = {50, 52};
> Line(25) = {51, 53};
> Line(27) = {46, 54};
> Line(28) = {54, 1};
> Line(29) = {48, 54};
> Line(30) = {45, 49};
> Line(31) = {47, 45};
> Line Loop(22) = {18, 21, -19, -20};
> Ruled Surface(22) = {22};
> Line Loop(26) = {19, 25, -23, -24};
> Ruled Surface(26) = {26};
> Line Loop(33) = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16,
> -31, -17, 27, 28};
> Plane Surface(33) = {33};
> Line Loop(35) = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16,
> 30, -18, 29};
> Plane Surface(35) = {35};
>
>
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