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benchmarks/extrude/duct_boundary_layer.geo

+lc = 0.3;
+Point(1) = {0.0,0.0,0.0,lc};
+Point(2) = {1,0.0,0.0,lc};
+Point(3) = {1,1,0.0,lc};
+Point(4) = {0,1,0.0,lc};
+Line(1) = {4,3};
+Line(2) = {3,2};
+Line(3) = {2,1};
+Line(4) = {1,4};
+Line Loop(1) = {2,3,4,1};
+Plane Surface(1) = {1};
+
+// create a cube
+Extrude {0,0.0,3} { Surface{1}; }
+
+// remove the volume
+Delete { Volume{1}; }
+
+// extrude the boundary of the cube inwards by 0.05, with 5 layers of elements
+Extrude { Surface{26, -1, 13, 17, 21, 25}; Layers{5, 0.05}; }
+
+// create inner volume
+Surface Loop(159) = {92, 158, 70, 48, 136, 114};
+Volume(160) = {159};
+
+General.ExpertMode = 1; // disable warning about mixing Delaunay and extrusion