[Gmsh] Uniform element size throughout the geometry

Thu May 17 08:55:15 CEST 2018

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.farooq at 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
> <mesh.png>_______________________________________________
> gmsh mailing list
> gmsh at onelab.info
> http://onelab.info/mailman/listinfo/gmsh

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