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benchmarks/3d/sphere_layer_netgen.geo

+
+lc=0.1;
+r1=0.3; // inner sphere radius
+r2=0.6; // outer layer radius
+
+// inner semicircle points
+Point(1) = {0,0,0,lc};
+Point(2) = {0,0,-r1,lc};
+Point(3) = {0,-r1,0,lc};
+Point(4) = {0,0,r1,lc};
+
+// outer semicircle points
+Point(5) = {0,0,-r2,lc};
+Point(6) = {0,-r2,0,lc};
+Point(7) = {0,0,r2,lc};
+
+// inner semicircle lines
+Line(1) = {1,2};
+Circle(2) = {2,1,3};
+Circle(3) = {3,1,4};
+Line(4) = {4,1};
+
+// outer semicircular slice lines
+Line(5) = {2,5};
+Circle(6) = {5,1,6};
+Circle(7) = {6,1,7};
+Line(8) = {7,4};
+
+// inner semi-circle line loop
+Line Loop(9) = {1,2,3,4};
+// outer slice line loop
+Line Loop(10) = {5,6,7,8,-3,-2};
+
+// inner semi-circular plane
+Plane Surface(12) = {9};
+// outer layer plane
+Plane Surface(13) = {10};
+
+// extrude inner semi-circle to get inner sphere
+v1[] = Extrude {{0.0,0.0,1.0}, {0.0,0.0,0.0},-2*Pi/3}{ Surface {12}; };
+v2[] = Extrude {{0.0,0.0,1.0}, {0.0,0.0,0.0},-2*Pi/3}{ Surface {v1[0]}; };
+v3[] = Extrude {{0.0,0.0,1.0}, {0.0,0.0,0.0},-2*Pi/3}{ Surface {v2[0]}; };
+
+// extrude outer slice to get outer spherical layer
+v4[] = Extrude {{0.0,0.0,1.0}, {0.0,0.0,0.0},-2*Pi/3}{ Surface {13}; };
+v5[] = Extrude {{0.0,0.0,1.0}, {0.0,0.0,0.0},-2*Pi/3}{ Surface {v4[0]}; };
+v6[] = Extrude {{0.0,0.0,1.0}, {0.0,0.0,0.0},-2*Pi/3}{ Surface {v5[0]}; };
+
+Delete { 
+  Volume{v1[1], v2[1], v3[1], v4[1], v5[1], v6[1]}; 
+}
+
+Surface Loop(112) = {36,-27,41,39};
+Volume(113) = {112};
+Surface Loop(114) = {86,-75,97,89,-39,-36};
+Volume(115) = {114};
+
+Surface Loop(116) = {25,27,-12,22};
+Volume(117) = {116};
+Surface Loop(118) = {64,-13,75,67,-25,-22};
+Volume(119) = {118};
+
+Surface Loop(120) = {53,12,-41,50};
+Volume(121) = {120};
+Surface Loop(122) = {111,13,-97,108,-53,-50};
+Volume(123) = {122};
+
+// assign volume number 1 to outer layer
+Physical Volume(1) = {115,119,122};
+
+// assign volume number 2 to inner sphere
+Physical Volume(2) = {113,117,121};
+
+Mesh.Algorithm3D = 4; //netgen