Hi,

Just in case, don't forget to check the options...

http://gmsh.info/doc/texinfo/gmsh.html#Options

...To reset all options to their default values, use the ‘Restore default options’ button in ‘Tools->Options->General->Advanced’, or erase the General.SessionFileName and General.OptionsFileName files by hand...

Regards,

Dave

--
David Colignon, Ph.D.
1er Logisticien de Recherche
Université de Liège
ACE - Applied & Computational Electromagnetics
Quartier POLYTECH 1 - Montefiore B28
Allée de la découverte 10
4000 Liège - BELGIQUE
Tél: +32 (0)4 366 37 32
http://www.ulg.ac.be/nic4

On 17/05/18 10:27, Harris FAROOQ wrote:
Hello,

With the default algorithm we get coarse elements away from the element set 
boundary.

By default algorithm I mean:*gmsh file.geo -3*

Best regards,
Harris
------------------------------------------------------------------------------------------------------------------------
*From: *"Christophe Geuzaine" <geuza...@gmail.com>
*To: *"Harris FAROOQ" <harris.far...@mines-paristech.fr>
*Cc: *gmsh@onelab.info
*Sent: *Thursday, May 17, 2018 8:55:15 AM
*Subject: *Re: [Gmsh] Uniform element size throughout the geometry


With the default algorithm evrything looks ok to me (don't use -algo front3d 
unless you really have to).

    On 9 May 2018, at 17:12, Harris FAROOQ <harris.far...@mines-paristech.fr 
<mailto:harris.far...@mines-paristech.fr>>
    wrote:

    Hello,

    I am trying to get a uniform element size throughout the geometry. I have 
tried giving a constant value to element
    size and mesh "mesh size fields" but they do not work i.e. I get a uniform 
mesh at the boundary but inside the
    geometry, the elements are coarse.

    I have also attached an image to clarify the problem.

    I have also tried:

    -algo front3d -3 or -algo front3d -3 -optimize_netgen

    but these options do not give a uniform mesh inside the geometry.

    Is it possible to get a uniform mesh size throughout the geometry?

    My geo file looks like this:

    Point(1) ={0.315650761382760, 0.894382926819093, -0.302448630706616, 
0.100000000000000};
    Point(2) ={1.298440033476073, 1.362940371711625, 0.283099223758606, 
0.100000000000000};
    Point(3) ={1.298440033476073, 0.894382926819093, -0.262655810088256, 
0.100000000000000};
    Point(4) ={0.735232865266709, 1.411647357936784, 0.283099223758606, 
0.100000000000000};
    Point(5) ={0.340187717154710, 1.411647357936784, 0.311264675576753, 
0.100000000000000};
    Point(6) ={0.298440033476073, 0.457103015216639, 0.283099223758606, 
0.100000000000000};
    Point(7) ={0.903394885364074, 0.894382926819093, 0.697551369293384, 
0.100000000000000};
    Point(8) ={1.298440033476073, 0.894382926819093, 0.669385917475237, 
0.100000000000000};
    Point(9) ={0.340187717154710, 0.848927269539238, 0.697551369293384, 
0.100000000000000};
    Point(10) ={0.340187717154709, 0.411647357936784, 0.243306403140246, 
0.100000000000000};
    Point(11) ={0.735232865266709, 0.411647357936784, 0.283099223758606, 
0.100000000000000};
    Point(12) ={1.298440033476073, 0.457103015216640, 0.283099223758606, 
0.100000000000000};
    Point(13) ={0.903394885364074, 0.894382926819093, -0.302448630706616, 
0.100000000000000};
    Point(14) ={0.298440033476073, 0.894382926819093, -0.262655810088257, 
0.100000000000000};
    Point(15) ={0.322976989248022, 1.411647357936784, 0.283099223758606, 
0.100000000000000};
    Point(16) ={0.340187717154710, 0.943089913044252, 0.697551369293384, 
0.100000000000000};
    Point(17) ={0.315650761382760, 0.894382926819093, 0.697551369293384, 
0.100000000000000};
    Point(18) ={0.340187717154709, 0.848927269539238, -0.302448630706616, 
0.100000000000000};
    Point(19) ={0.322976989248022, 0.411647357936784, 0.283099223758606, 
0.100000000000000};
    Point(20) ={0.340187717154710, 0.411647357936784, 0.311264675576753, 
0.100000000000000};
    Point(21) ={0.340187717154709, 1.411647357936784, 0.243306403140246, 
0.100000000000000};
    Point(22) ={0.340187717154709, 0.943089913044252, -0.302448630706616, 
0.100000000000000};
    Point(23) ={0.298440033476073, 1.362940371711625, 0.283099223758606, 
0.100000000000000};
    Point(24) ={0.298440033476073, 0.894382926819093, 0.669385917475237, 
0.100000000000000};
    Point(25) ={0.340187717154710, -0.056910086955748, 0.697551369293384, 
0.100000000000000};
    Point(26) ={0.903394885364075, -0.105617073180907, 0.697551369293384, 
0.100000000000000};
    Point(27) ={1.322976989248022, 0.411647357936784, 1.283099223758606, 
0.100000000000000};
    Point(28) ={1.298440033476073, 0.362940371711625, 1.283099223758606, 
0.100000000000000};
    Point(29) ={0.340187717154710, 0.411647357936784, 1.243306403140246, 
0.100000000000000};
    Point(30) ={1.298440033476073, 0.457103015216639, 1.283099223758606, 
0.100000000000000};
    Point(31) ={1.340187717154710, -0.056910086955748, 0.697551369293384, 
0.100000000000000};
    Point(32) ={1.315650761382761, 0.894382926819093, 0.697551369293384, 
0.100000000000000};
    Point(33) ={0.735232865266709, 0.411647357936784, 1.283099223758606, 
0.100000000000000};
    Point(34) ={1.298440033476073, 0.894382926819093, 0.737344189911744, 
0.100000000000000};
    Point(35) ={1.298440033476074, -0.105617073180907, 0.737344189911744, 
0.100000000000000};
    Point(36) ={1.298440033476073, 0.362940371711625, 0.283099223758606, 
0.100000000000000};
    Point(37) ={1.315650761382761, -0.105617073180907, 0.697551369293384, 
0.100000000000000};
    Point(38) ={1.298440033476073, -0.105617073180907, 0.669385917475237, 
0.100000000000000};
    Point(39) ={1.340187717154710, 0.411647357936784, 1.243306403140246, 
0.100000000000000};
    Point(40) ={1.322976989248022, 0.411647357936784, 0.283099223758606, 
0.100000000000000};
    Point(41) ={1.340187717154710, 0.848927269539238, 0.697551369293384, 
0.100000000000000};
    Point(42) ={1.340187717154710, 0.411647357936784, 0.311264675576753, 
0.100000000000000};
    Line(1) = {2, 3};
    Line(2) = {3, 12};
    Line(3) = {12, 8};
    Line(4) = {8, 2};
    Line(5) = {2, 4};
    Line(6) = {4, 21};
    Line(7) = {21, 22};
    Line(8) = {22, 13};
    Line(9) = {13, 3};
    Line(10) = {8, 7};
    Line(11) = {7, 16};
    Line(12) = {16, 5};
    Line(13) = {5, 4};
    Line(14) = {13, 18};
    Line(15) = {18, 10};
    Line(16) = {10, 11};
    Line(17) = {11, 12};
    Line(18) = {5, 15};
    Line(19) = {15, 21};
    Line(20) = {16, 17};
    Line(21) = {17, 24};
    Line(22) = {24, 23};
    Line(23) = {23, 15};
    Line(24) = {6, 24};
    Line(25) = {17, 9};
    Line(26) = {9, 20};
    Line(27) = {20, 19};
    Line(28) = {19, 6};
    Line(29) = {6, 14};
    Line(30) = {14, 23};
    Line(31) = {19, 10};
    Line(32) = {18, 1};
    Line(33) = {1, 14};
    Line(34) = {7, 9};
    Line(35) = {11, 20};
    Line(36) = {22, 1};
    Line(37) = {26, 35};
    Line(38) = {35, 37};
    Line(39) = {37, 38};
    Line(40) = {38, 26};
    Line(41) = {26, 25};
    Line(42) = {25, 29};
    Line(43) = {29, 33};
    Line(44) = {33, 28};
    Line(45) = {28, 35};
    Line(46) = {38, 36};
    Line(47) = {36, 11};
    Line(48) = {20, 25};
    Line(49) = {27, 30};
    Line(50) = {30, 34};
    Line(51) = {34, 32};
    Line(52) = {32, 41};
    Line(53) = {41, 39};
    Line(54) = {39, 27};
    Line(55) = {27, 28};
    Line(56) = {33, 30};
    Line(57) = {39, 31};
    Line(58) = {31, 37};
    Line(59) = {36, 40};
    Line(60) = {40, 12};
    Line(61) = {40, 42};
    Line(62) = {42, 41};
    Line(63) = {32, 8};
    Line(64) = {34, 7};
    Line(65) = {9, 29};
    Line(66) = {31, 42};
    Line Loop(67) = {1, 2, 3, 4};
    Plane Surface(1) = {67};
    Line Loop(68) = {5, 6, 7, 8, 9, -1};
    Plane Surface(2) = {68};
    Line Loop(69) = {-4, 10, 11, 12, 13, -5};
    Plane Surface(3) = {69};
    Line Loop(70) = {-9, 14, 15, 16, 17, -2};
    Plane Surface(4) = {70};
    Line Loop(71) = {-13, 18, 19, -6};
    Plane Surface(5) = {71};
    Line Loop(72) = {-12, 20, 21, 22, 23, -18};
    Plane Surface(6) = {72};
    Line Loop(73) = {24, -21, 25, 26, 27, 28};
    Plane Surface(7) = {73};
    Line Loop(74) = {29, 30, -22, -24};
    Plane Surface(8) = {74};
    Line Loop(75) = {-28, 31, -15, 32, 33, -29};
    Plane Surface(9) = {75};
    Line Loop(76) = {34, -25, -20, -11};
    Plane Surface(10) = {76};
    Line Loop(77) = {-10, -3, -17, 35, -26, -34};
    Plane Surface(11) = {77};
    Line Loop(78) = {-31, -27, -35, -16};
    Plane Surface(12) = {78};
    Line Loop(79) = {-8, 36, -32, -14};
    Plane Surface(13) = {79};
    Line Loop(80) = {-33, -36, -7, -19, -23, -30};
    Plane Surface(14) = {80};
    Line Loop(81) = {37, 38, 39, 40};
    Plane Surface(15) = {81};
    Line Loop(82) = {41, 42, 43, 44, 45, -37};
    Plane Surface(16) = {82};
    Line Loop(83) = {-40, 46, 47, 35, 48, -41};
    Plane Surface(17) = {83};
    Line Loop(84) = {49, 50, 51, 52, 53, 54};
    Plane Surface(18) = {84};
    Line Loop(85) = {55, -44, 56, -49};
    Plane Surface(19) = {85};
    Line Loop(86) = {-54, 57, 58, -38, -45, -55};
    Plane Surface(20) = {86};
    Line Loop(87) = {-47, 59, 60, -17};
    Plane Surface(21) = {87};
    Line Loop(88) = {-3, -60, 61, 62, -52, 63};
    Plane Surface(22) = {88};
    Line Loop(89) = {-63, -51, 64, -10};
    Plane Surface(23) = {89};
    Line Loop(90) = {-42, -48, -26, 65};
    Plane Surface(24) = {90};
    Line Loop(91) = {-65, -34, -64, -50, -56, -43};
    Plane Surface(25) = {91};
    Line Loop(92) = {66, -61, -59, -46, -39, -58};
    Plane Surface(26) = {92};
    Line Loop(93) = {-57, -53, -62, -66};
    Plane Surface(27) = {93};
    Surface Loop(29) = {1,2,3,4,5,6,7,8,9,10,11,12,13,14};
    Volume(1)={29};
    Physical Volume(1)={1};
    Surface Loop(30) = {15,16,17,18,19,20,11,21,22,23,24,25,26,27};
    Volume(2)={30};
    Physical Volume(2)={2};
    Periodic Surface 1 {1,2,3,4} = 8 {-30,-29,24,22};
    Periodic Surface 2 {5,6,7,8,9,-1} = 3 {5,-13,-12,-11,-10,4};
    Periodic Surface 2 {5,6,7,8,9,-1} = 4 {-17,-16,-15,-14,9,2};
    Periodic Surface 2 {5,6,7,8,9,-1} = 14 {23,19,7,36,33,30};
    Periodic Surface 3 {-4,10,11,12,13,-5} = 6 {-22,-21,-20,12,18,-23};
    Periodic Surface 3 {-4,10,11,12,13,-5} = 11 {3,10,34,26,-35,17};
    Periodic Surface 3 {-4,10,11,12,13,-5} = 17 {-46,40,41,-48,-35,-47};
    Periodic Surface 4 {-9,14,15,16,17,-2} = 9 {-33,-32,15,-31,28,29};
    Periodic Surface 4 {-9,14,15,16,17,-2} = 11 {10,34,26,-35,17,3};
    Periodic Surface 4 {-9,14,15,16,17,-2} = 25 {64,34,65,43,56,50};
    Periodic Surface 5 {-13,18,19,-6} = 12 {35,27,31,16};
    Periodic Surface 6 {-12,20,21,22,23,-18} = 7 {-26,-25,21,-24,-28,-27};
    Periodic Surface 6 {-12,20,21,22,23,-18} = 14 {7,36,33,30,23,19};
    Periodic Surface 7 {24,-21,25,26,27,28} = 9 {29,-33,-32,15,-31,28};
    Periodic Surface 7 {24,-21,25,26,27,28} = 11 {3,10,34,26,-35,17};
    Periodic Surface 7 {24,-21,25,26,27,28} = 22 {3,-63,52,-62,-61,60};
    Periodic Surface 9 {-28,31,-15,32,33,-29} = 14 {23,19,7,36,33,30};
    Periodic Surface 10 {34,-25,-20,-11} = 13 {14,32,-36,8};
    Periodic Surface 11 {-10,-3,-17,35,-26,-34} = 17 {40,-46,-47,-35,-48,41};
    Periodic Surface 11 {-10,-3,-17,35,-26,-34} = 22 {-63,3,60,-61,-62,52};
    Periodic Surface 11 {-10,-3,-17,35,-26,-34} = 25 {64,50,56,43,65,34};
    Periodic Surface 15 {37,38,39,40} = 23 {-64,51,63,10};
    Periodic Surface 16 {41,42,43,44,45,-37} = 17 {41,-48,-35,-47,-46,40};
    Periodic Surface 16 {41,42,43,44,45,-37} = 20 {-58,-57,54,55,45,38};
    Periodic Surface 16 {41,42,43,44,45,-37} = 25 {34,65,43,56,50,64};
    Periodic Surface 17 {-40,46,47,35,48,-41} = 26 {39,46,59,61,-66,58};
    Periodic Surface 18 {49,50,51,52,53,54} = 20 {55,45,38,-58,-57,54};
    Periodic Surface 18 {49,50,51,52,53,54} = 22 {60,3,-63,52,-62,-61};
    Periodic Surface 18 {49,50,51,52,53,54} = 25 {56,50,64,34,65,43};
    Periodic Surface 19 {55,-44,56,-49} = 21 {-59,47,17,-60};
    Periodic Surface 20 {-54,57,58,-38,-45,-55} = 26 {61,-66,58,39,46,59};
    Periodic Surface 22 {-3,-60,61,62,-52,63} = 26 {46,59,61,-66,58,39};
    Periodic Surface 24 {-42,-48,-26,65} = 27 {57,66,62,53};


    Best regards,
    Harris Farooq
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