# [Gmsh] Strange mesh in a curved square

Bertrand Thierry bertrand.thierry at sorbonne-universite.fr
Wed Feb 26 10:27:51 CET 2020

```Hello,

Part of your code is missing : I cannot reproduce it.

I however suspect the lastline to be the bad guy :

Plane Surface(s_low_i) = {ll_low_i};

Could you try with "Surface" (instead of "Plane Surface") ?

Best,

Bertrand

Le 25/02/2020 à 17:18, Sabrina Zacarias a écrit :
> 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
>  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
> S2|14 / office 319
> Schlossgartenstr. 9
>
>
> Office: +49 6151 16 23589
>
>
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--
Bertrand THIERRY
CNRS researcher
Laboratoire Jacques Louis Lions
Office 310, Corridor 15-25
+33 1 44 27 72 01
http://bthierry.pages.math.cnrs.fr/

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