# [Gmsh] Strange mesh in a curved square

Sabrina Zacarias szacarias at ikp.tu-darmstadt.de
Tue Feb 25 17:18:38 CET 2020

```Dear experts,

I am doing a very simple test to see the mesh of a surface, but the output is not right (see attachment). I would be grateful if someone can point out what I’m missing. This is the code:

//Electrode
16  lc_el=1;
17  x0=0;
18  y0=0;
19  z0=0;
20  w=50;
21
22  //inner radius
23
24  pel_1_1 = newp; Point(pel_1_1) =  {x0,y0,z0,lc_el}; //center
25  pel_2_1 = newp; Point(pel_2_1) =  {Rel_in,y0,z0,lc_el};
26  pel_3_1 = newp; Point(pel_3_1) =  {x0,Rel_in,z0,lc_el};
27
28  //circular boundary 1
29
30 cel_1_i = newc; Circle(cel_1_i) = {pel_2_1,pel_1_1,pel_3_1};
31 //same +width
32 pel_1_2 = newp; Point(pel_1_2) =  {x0,y0,z0+w,lc_el}; //center
33 pel_2_2 = newp; Point(pel_2_2) =  {Rel_in,y0,z0+w,lc_el};
34 pel_3_2 = newp; Point(pel_3_2) =  {x0,Rel_in,z0+w,lc_el};
35
36 //circular boundary 2
37
38 cel_2_i = newc; Circle(cel_2_i) = {pel_3_2,pel_1_2,pel_2_2};
39
40 //lines connecting circles 1 & 2 (translated in z===width)
41
42 l_low_i = newl; Line(l_low_i) = {pel_2_2,pel_2_1};
43 l_low_ii = newl; Line(l_low_ii) = {pel_3_1,pel_3_2};
44
45 //surface loop
46
47 ll_low_i = newreg; Line Loop(ll_low_i) = {cel_1_i,l_low_ii,cel_2_i,l_low_i};
48 s_low_i = news; Plane Surface(s_low_i) = {ll_low_i};
49

Thank you very much in advance.

Best regards,

Sabrina

--
Sabrina Zacarias
Institut für Kernphysik
Technische Universität Darmstadt
S2|14 / office 319
Schlossgartenstr. 9

64289 Darmstadt

Office: +49 6151 16 23589

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```

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