[Gmsh] Very strange effect - Mesh elements deleted when saving

Thu Jul 2 16:00:46 CEST 2015

Dear All,

The problem I have is the following: Once i have saved the mesh, some
elements (parallel to the z direction), disappear whan I open the mesh
again. (see screenshots). Thus, the mesh does not work properly in the
right part of the geometry.

Does anybody have an idea why this could be?? I'm sincerely desperated.

I have the following geometry:

> // Gmsh project created on Tue Feb 24 11:10:01 2015

// nozzle end at x=0

//moltiplication coefficients

mm=1e-3;

mi=1e-6;

> // Parameters: -------------------------------

d_nz=10*mi; //nozzle diameter 10 microns

d_c=1*mm; //inner diameter pressing collar and of first meshing zone

h_c=0.1*mm; //inner step pressing collar

H_c=4*mm; //ext heigh pressing collar

D_c=11.8*mm; //ext diameter pressing collar

D_ext=25*mm; //ext boundary

D_nz_sk=2*mm; //+9.5*mi; //11.6*mm; //nz-sk-distance
> &&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&6

//-glass---------

d_sk=20*mi; //internal sk diameter

t_sk=1*mi; //glass thickness at the entrance

h_gl=0.2*mm; //ext part of microSK inside the cone
> &&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&

h_gl_c=1*mm; //ext conical part of microSK

h_gl_int=1*mm; //int part of microSK

h_gl_chan=0.5*mi; //channel in front of the ext skimmer

d_gl=1.5*mm; //ext dia of capillary microSK

d_gl_int=1.1*mm; //int dia of capillary

h_glue=0.3*mm; //height of the glue

//----------------

d_cone=2*mm; //ext cone dia at the microSK

d_cone_int=1.5*mm; //int cone dia

D_cone=22*mm; //ext cone dia at the base

D_cone_int=21.5*mm; //int cone dia at the base

h_cone=21*mm;

h_ext=3*mm; //internal pressing ring heigh at dia 25mm !!!!!

// radii -------------------------------------------

r_nz=d_nz/2; //nozzle radius

r_c=d_c/2; //inner collar radius

R_c=D_c/2; //ext collar radius

R_ext=D_ext/2; //boundary radius

r_sk=d_sk/2; //

r_gl_int=d_gl_int/2;

r_gl=d_gl/2;

r_cone=d_cone/2;

r_cone_int=d_cone_int/2;

R_cone=D_cone/2;

R_cone_int=D_cone_int/2;

// Initial cell radius (im microm) to ensure enough particles

//In_cell=(11^0.5)*mi;

In_cell=3.316625*mi;

//lnk_y2=In_cell*(2^0.5)*mi;

// size of mesh

dens=0.02*mm;

dens_nz=r_nz/8;

dens_nz1=r_nz/2;

dens_nz2=2*r_nz;

newdens=dens_nz1*3;

dens_sk=r_sk/8;

dens_sk1=r_sk/2;

dens_sk2=2*r_sk;

dens_tsk=t_sk/5;

> dens_nzsk=0.5*(dens_nz2+dens_sk2);

//links-----------------------------------

//link x------------

lnk_x1=10*d_nz-2*h_gl_chan;

lnk_x2=3*d_nz-h_gl_chan;

lnk_x3=D_nz_sk-2*h_gl_chan-r_sk;

lnk_x4=D_nz_sk+0.02*h_gl_c+t_sk+h_gl_chan;

//link y------------

lnk_y1=3*d_nz;

//lnk_y2=r_sk-3*t_sk;

//lnk_y2=In_cell*(2^0.5);

lnk_y2=In_cell*1.414214;

// Nozzle------------------------------------------

> Point(1) = {0, 0, 0, dens_nz*1.5}; //origin

Point(2) = {0, r_nz, 0, dens_nz}; //nozzle boundary

Point(3) = {0, r_c, 0, dens*4};

Point(4) = {h_c, r_c, 0, dens*4};

> // New points for an appropiate radial division

Point(5) = {lnk_x2,In_cell, 0,dens_nz1};

Point(6) = {lnk_x3, In_cell, 0, dens_sk1}; //on axis nozzle boundary

Point(7) = {lnk_x4, In_cell, 0, dens_sk2};

Point(8) = {D_nz_sk+h_gl_c+h_gl+h_gl_chan, In_cell, 0, dens};

//New points for a new denser area around the source

Point(9) = {0.0005, 0, 0, newdens};

Point(10) = {0.0005, lnk_y2, 0, newdens};

Point(11) = {0.0005, In_cell, 0, newdens};

//We put a point in line 17

Point(12)= {0.0005, 10*d_nz, 0, newdens};

//one in the middle

Point(13)={0.00025, 22*d_nz, 0, newdens};

//and we plan to close it at point 55, however no surface is really required

> Point(14) = {D_nz_sk+h_gl_chan, r_sk+t_sk, 0, 0.5*(dens_tsk+dens_sk)*1.25};

Point(15) = {D_nz_sk, r_sk+t_sk, 0, dens_tsk*5.25};

Point(16) = {D_nz_sk, r_sk, 0, dens_tsk*5}; //nozzle boundary

Point(17) = {D_nz_sk+h_gl_chan+t_sk, r_sk, 0, dens_sk};

Point(18) = {D_nz_sk+h_gl_c+h_gl_chan+t_sk, r_gl_int, 0, dens*4};

Point(19) = {D_nz_sk+h_gl_c+h_gl+h_gl_chan, r_gl_int, 0, dens*4};

Point(20) = {0.00025+0.5*(0.00025), (22-2)*d_nz, 0, newdens};

> Point(26) = {lnk_x3, 0, 0, dens_sk1}; //on axis nozzle boundary

> Point(31) = {lnk_x4, 0, 0, dens_sk2};

> Point(32) = {D_nz_sk+0.02*h_gl_c+t_sk+h_gl_chan,
> r_sk+(r_gl_int-r_sk)*0.02*h_gl_c/h_gl_c, 0, dens_sk*1.5}; //

Point(33) = {D_nz_sk+0.02*h_gl_c+h_gl_chan,
> r_sk+t_sk+(r_gl-r_sk-t_sk)*0.02*h_gl_c/h_gl_c, 0, dens_nzsk}; //

Point(34) = {lnk_x3, r_sk+t_sk+(r_gl-r_sk-t_sk)*0.02*h_gl_c/h_gl_c, 0,
> dens_nzsk}; //

Point(35) = {D_nz_sk+0.05*h_gl_c+t_sk+h_gl_chan,
> r_sk+(r_gl_int-r_sk)*0.05*h_gl_c/h_gl_c, 0, dens_sk*2*1.5}; //

Point(36) =
> {D_nz_sk+h_gl_chan+0.1*h_gl_c,r_sk+t_sk+(r_gl-r_sk-t_sk)*0.1*h_gl_c/h_gl_c,
> 0, dens_sk1*1.5}; //

//Point(37) = {D_nz_sk-8*h_gl_chan-r_sk,
> r_sk+t_sk+(r_gl-r_sk-t_sk)*8*h_gl_chan/h_gl_c, 0, dens_nzsk}; //

Point(37) = {lnk_x3, lnk_y2, 0, dens_nzsk}; //

> Point(50) = {lnk_x2,0,0,dens_nz1};

Point(51) = {lnk_x2,lnk_y2,0,dens_nz1};

Point(52) = {0, lnk_y1,0,dens_nz1};

Point(53) = {lnk_x2,lnk_y1,0,dens_nz1};

Point(54) = {0.5*(lnk_x1+lnk_x3),10*d_nz,0,dens_sk1*3};

Point(55) = {0,10*d_nz,0, newdens};

Point(56) = {D_nz_sk+h_gl_chan+0.7*h_gl_c,
> r_sk+t_sk+(r_gl-r_sk-t_sk)*0.7*h_gl_c/h_gl_c, 0, dens_sk2*4}; //

Point(59) = {D_nz_sk+h_gl_c+h_gl+h_gl_chan, 0, 0, dens}; //sotto punto 19

Point(60) = {D_nz_sk+h_gl_c+h_gl+h_gl_chan, lnk_y2, 0, dens}; //sotto punto
> 19

> //Point(70) = {lnk_x1,0.5*(lnk_y1+lnk_y2),dens_sk2};

//Point(80) = {D_nz_sk-6*t_sk, r_sk-3*t_sk, 0, dens_tsk}; //nozzle boundary

> Point(82) = {lnk_x4, lnk_y2, 0, dens_sk1}; //

//

Line(1) = {1, 2}; //nozzle line

Line(2) = {2, 52};

Line(3) = {52, 55};

Line(4) = {55, 3};

Line(5) = {3, 4};

//------------------

> Line(6) = {52, 53};

Line(7) = {51, 10}; //{51, 70, 37};

Line(8) = {6, 11};

Line(9) = {37, 82};

Line(10) = {82, 60};

Line(11) = {60, 8};

Line(12) = {59, 31};

//Line(13) = {31, 26};

Line(13) = {26, 31};

Line(14) = {26, 9}; //{26, 53, 50};

Spline(15) = {12, 20, 13, 55};

> Line(16) = {50, 1};

Line(17) = {12, 54};

Line(18) = {53, 51};

Line(19) = {34, 37};

Line(20) = {34, 33};

Line(21) = {4, 56};

Line(22) = {56, 36};

Line(23) = {36, 33};

Line(24) = {33, 14};

Line(25) = {14, 15};

Line(26) = {15, 16};

Line(27) = {16, 17};

Line(28) = {17, 32};

Line(29) = {32, 35};

Line(30) = {35, 18};

Line(31) = {18, 19};

Line(32) = {19, 60};

Line(33) = {32, 82};

Line(34) = {54, 36};

Line(35) = {9, 11};

Line(36) = {11, 10};

Line(37) = {37, 10};

Line(39) = {9, 50};

Line(40) = {10, 12};

Line(47) = {50, 5};

> Line(48) = {37, 6};

Line(49) = {82, 7};

> Line(150) = {6, 7};

Line(151) = {7, 8};

Line(152) = {6, 26};

Line(153) = {7, 31};

Line(154) = {8, 59};

Line(155) = {11, 5};

Line(156) = {5, 51};

> Line Loop(50) = {17, 34, -22, -21, -5, -4, -15};

Plane Surface(51) = {50};

Line Loop(52) = {15, -3, 6, 18, 7, 40};

Plane Surface(53) = {52};

Line Loop(54) = {35, -39,-47,155};

Plane Surface(55) = {54};

Line Loop(56) = {-17,-34,-23, 20, -19, -37, -40};

Plane Surface(57) = {56};

Line Loop(58) = {-6, -18, 156, 47, -16, -1, -2};

Plane Surface(59) = {58};

> Line Loop(60) = {37, -36, -8, -48};

Plane Surface(61) = {60};

Line Loop(62) = {8, -35, -14, -152};

Plane Surface(63) = {62};

Line Loop(64) = {-20, -24, -25, -26, -27, -28, -33, 9, 19};

Plane Surface(65) = {64};

Line Loop(66) = {-9, -49, 150, 48};

Plane Surface(67) = {66};

Line Loop(68) = {-150, -153, 13, 152};

Plane Surface(69) = {68};

Line Loop(70) = {-31,-32, 10, 33, -29, -30};

Plane Surface(71) = {70};

Line Loop(72) = {-10, -11, 151, 49};

Plane Surface(73) = {72};

Line Loop(74) = {-151, -154, -12, 153};

Plane Surface(75) = {74};

Line Loop(76) = {-7, 36, -155, -156};

Plane Surface(77) = {76};

> Transfinite Line{-37} = 80 Using Progression 1.015;

Transfinite Line{36} = 1 Using Bump 1.0;

Transfinite Line{-8} = 80 Using Progression 1.015;

Transfinite Line{48} = 1 Using Bump 1.0;

> Transfinite Surface {61} = {11, 10, 37, 6};

Recombine Surface{61};

//Mesh.Smoothing = 100;

> Transfinite Line{35} = 1 Using Bump 1.0;

Transfinite Line{-14} = 80 Using Progression 1.015;

Transfinite Line{152} = 1 Using Bump 1.0;

Transfinite Surface {63} = {9, 11, 6, 26};

Recombine Surface{63};

//Mesh.Smoothing = 100;

> Transfinite Line{9} = 3 Using Progression 1.0;

Transfinite Line{49} = 1 Using Bump 1.0;

Transfinite Line{150} = 3 Using Progression 1.0;

Transfinite Line{48} = 1 Using Bump 1.0;

Transfinite Surface {67} = {6, 37, 82, 7};

Recombine Surface{67};

//Mesh.Smoothing = 100;

> Transfinite Line{152} = 1 Using Bump 1.0;

Transfinite Line{13} = 3 Using Progression 1.0;

Transfinite Line{153} = 1 Using Bump 1.0;

Transfinite Surface {69} = {26, 6, 7, 31};

Recombine Surface{69};

> //Mesh.Smoothing = 100;

Transfinite Line{-10} = 40 Using Progression 1.0;

Transfinite Line{151} = 40 Using Progression 1.0;

Transfinite Line{11} = 1 Using Bump 1.0;

Transfinite Surface {73} = {7, 82, 60, 8};

Recombine Surface{73};

//Mesh.Smoothing = 100;

Transfinite Line{12} = 40 Using Progression 1.0;

Transfinite Line{154} = 1 Using Bump 1.0;

Transfinite Surface {75} = {31, 7, 8, 59};

Recombine Surface{75};

//Mesh.Smoothing = 100;

Transfinite Line{-155} = 134 Using Progression 1.015;

Transfinite Line{47} = 1 Using Bump 1.0;

Transfinite Line{-39} = 134 Using Progression 1.015;

Transfinite Surface {55} = {50, 5, 11, 9};

Recombine Surface{55};

//Mesh.Smoothing = 100;

Transfinite Line{7} = 134 Using Progression 1.015;

Transfinite Line{156} = 1 Using Bump 1;

Transfinite Surface {77} = {5, 51, 10, 11};

Recombine Surface{77};

Mesh.Smoothing = 100;

> //allPoints[] = Point "*" ;

//allLines[] = Line "*" ;

allSurfaces[] = Surface "*"; //allVolumes[] = Volume "*";

//allTranslines = Transfinite Line "*";

> Rotate {{1, 0, 0}, {0, 0, 0}, -(Pi*5)/(2*180) } { Surface{ allSurfaces[] }
> ; }

>
> Extrude {{1, 0, 0}, {0, 0, 0}, 2*(Pi*5)/(2*180) } {

Surface{ allSurfaces[] };

Layers{ 1 };

Recombine;

//QuadTriNoNewVerts RecombLaterals;

}

>
> Physical Surface("back") = {51, 53, 59, 77, 55, 57, 61, 63, 65, 67, 69,
> 73, 75, 71};//14

Physical Surface("front") = { 193, 225, 311, 529, 242, 350, 333, 279, 436,
> 419, 397, 507, 490, 468};

Physical Surface("inlet") = {298};

Physical Surface("nz_outlet") = {180};

Physical Surface("sk_outlet") = {506, 489, 467};

Physical Surface("nz_wall") = {295, 208, 188, 184};

Physical Surface("sk_wall") = {447, 451, 455, 384, 380, 388, 392, 396,
> 274,176};

> Physical Volume("internalField") = {5, 4, 3, 1, 2, 8, 7, 6};

Coherence Mesh;

-- 
>

Adrià Salvador Palau

+47 45165545
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