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benchmarks/3d/sphere_in_cube_hexa.geo

+l = 1;
+r1 = 3;
+r2 = 0.5;
+n = 3;
+n2 = n;
+
+// exterior cube
+Point(1) = {0,0,0,l};
+Point(2) = {r1,r1,-r1,l};
+Point(3) = {-r1,r1,-r1,l};
+Point(4) = {-r1,-r1,-r1,l};
+Point(5) = {r1,-r1,-r1,l};
+Line(1) = {2,3};
+Line(2) = {3,4};
+Line(3) = {4,5};
+Line(4) = {5,2};
+Transfinite Line{1:4} = n;
+Line Loop(5) = {4,1,2,3};
+Plane Surface(6) = {5};
+Transfinite Surface{6} = {2,3,4,5};
+Recombine Surface{6};
+Extrude Surface {6, {0.0,0.0,2*r1}};
+Delete { Volume{1}; }
+
+// force transfinite grid on exterior cube
+Transfinite Line {3,22,11,13,8,4,14,9,1,18,10,2} = n;
+Transfinite Surface {6} = {4,5,2,3};
+Transfinite Surface {15} = {5,6,7,2};
+Transfinite Surface {19} = {11,7,2,3};
+Transfinite Surface {23} = {4,15,11,3};
+Transfinite Surface {27} = {15,6,5,4};
+Transfinite Surface {28} = {15,6,7,11};
+Recombine Surface{6,15,19,23,27,28};
+
+// interior sphere
+Point(102) = {r2,r2,-r2,l};
+Point(103) = {-r2,r2,-r2,l};
+Point(104) = {-r2,-r2,-r2,l};
+Point(105) = {r2,-r2,-r2,l};
+Circle(29) = {103,1,102};
+Circle(30) = {102,1,105};
+Circle(31) = {105,1,104};
+Circle(32) = {104,1,103};
+Line Loop(33) = {29,30,31,32};
+Ruled Surface(34) = {33};
+Rotate { {1,0,0},{0,0,0}, Pi/2 } { Duplicata{ Surface{34}; } }
+Rotate { {1,0,0},{0,0,0}, Pi } { Duplicata{ Surface{34}; } }
+Rotate { {1,0,0},{0,0,0}, 3*Pi/2 } { Duplicata{ Surface{34}; } }
+Rotate { {0,1,0},{0,0,0}, Pi/2 } { Duplicata { Surface{34}; } }
+Rotate { {0,1,0},{0,0,0}, -Pi/2 } { Duplicata { Surface{34}; } }
+
+// force transfinite grid on interior sphere
+Transfinite Line{29:59} = n;
+Transfinite Surface {34} = {102,103,104,105};
+Transfinite Surface {35} = {106,108,102,103};
+Transfinite Surface {40} = {109,111,108,106};
+Transfinite Surface {45} = {104,105,111,109};
+Transfinite Surface {50} = {104,109,106,103};
+Transfinite Surface {51} = {105,111,108,102};
+Recombine Surface{34,35,40,45,50,51};
+
+// connect sphere and cube
+Line(52) = {102,2};
+Line(53) = {108,7};
+Line(54) = {105,5};
+Line(55) = {111,6};
+Line(56) = {109,15};
+Line(57) = {104,4};
+Line(58) = {103,3};
+Line(59) = {106,11};
+Transfinite Line{52:59} = n2;
+
+Line Loop(60) = {58,-1,-52,-29};Plane Surface(61) = {60};
+Line Loop(62) = {58,18,-59,-39};Plane Surface(63) = {62};
+Line Loop(64) = {59,-9,-53,-36};Plane Surface(65) = {64};
+Line Loop(66) = {37,52,14,-53};Plane Surface(67) = {66};
+Line Loop(68) = {56,-22,-57,-49};Plane Surface(69) = {68};
+Line Loop(70) = {31,57,3,-54};Plane Surface(71) = {70};
+Line Loop(72) = {54,13,-55,-47};Plane Surface(73) = {72};
+Line Loop(74) = {55,-11,-56,41};Plane Surface(75) = {74};
+Line Loop(76) = {59,10,-56,-44};Plane Surface(77) = {76};
+Line Loop(78) = {58,2,-57,32};Plane Surface(79) = {78};
+Line Loop(80) = {52,-4,-54,-30};Plane Surface(81) = {80};
+Line Loop(82) = {42,53,-8,-55};Plane Surface(83) = {82};
+
+// force transfinite grid on connection surfaces
+Transfinite Surface {61} = {103,102,2,3};
+Transfinite Surface {63} = {106,103,3,11};
+Transfinite Surface {65} = {11,7,108,106};
+Transfinite Surface {67} = {102,108,7,2};
+Transfinite Surface {69} = {4,15,109,104};
+Transfinite Surface {71} = {5,4,104,105};
+Transfinite Surface {73} = {6,5,105,111};
+Transfinite Surface {75} = {15,6,111,109};
+Transfinite Surface {77} = {15,109,106,11};
+Transfinite Surface {79} = {4,104,103,3};
+Transfinite Surface {81} = {105,5,2,102};
+Transfinite Surface {83} = {111,6,7,108};
+Recombine Surface{61:83:2};
+
+// connection volumes
+Surface Loop(84) = {19,61,-63,-65,67,-35}; Volume(85) = {84};
+Surface Loop(86) = {34,61,-79,6,81,-71}; Volume(87) = {86};
+Surface Loop(88) = {23,-79,63,77,69,-50}; Volume(89) = {88};
+Surface Loop(90) = {28,83,-40,75,-77,65}; Volume(91) = {90};
+Surface Loop(92) = {15,81,-67,-51,-83,73}; Volume(93) = {92};
+Surface Loop(94) = {27,-71,-45,-73,-75,-69}; Volume(95) = {94};
+
+// force transfinite grid on connection volume
+Transfinite Volume{85} = {106,108,102,103,11,7,2,3};
+Transfinite Volume{87} = {104,105,102,103,4,5,2,3};
+Transfinite Volume{89} = {104,109,106,103,4,15,11,3};
+Transfinite Volume{91} = {109,111,108,106,15,6,7,11};
+Transfinite Volume{93} = {111,105,102,108,6,5,2,7};
+Transfinite Volume{95} = {109,104,105,111,15,4,5,6};
+
+Physical Volume(1) = {85:95:2}; // ext volume
+Physical Surface(100) = {34,35,40,45,50,51}; // int surf
+Physical Surface(101) = {6,15,19,23,27,28}; // ext surf