add sample with multiple holes geo file and mesh

Author: yangbai90

tests/pffracture/sampleholes.geo

@@ -0,0 +1,113 @@
+SetFactory("OpenCASCADE");
+
+dx=0.01;
+w=1.0;
+
+n=81;
+
+Point(1)={0.0,0.0,0.0,dx};
+Point(2)={  w,0.0,0.0,dx};
+Point(3)={  w,  w,0.0,dx};
+Point(4)={0.0,  w,0.0,dx};//+
+
+//+
+Line(1) = {1, 2};
+//+
+Line(2) = {2, 3};
+//+
+Line(3) = {3, 4};
+//+
+Line(4) = {4, 1};
+//+
+Line Loop(1) = {4, 1, 2, 3};
+//+
+Plane Surface(1) = {1};
+
+Circle(5) = {0.25, 0.15, 0, 0.08, 0, 2*Pi};
+//+
+Circle(6) = {0.5, 0.15, 0, 0.08, 0, 2*Pi};
+//+
+Circle(7) = {0.75, 0.15, 0, 0.08, 0, 2*Pi};
+
+//+
+Circle(8) = {0.25, 0.4, 0, 0.08, 0, 2*Pi};
+//+
+Circle(9) = {0.5, 0.4, 0, 0.08, 0, 2*Pi};
+//+
+Circle(10) = {0.75, 0.4, 0, 0.08, 0, 2*Pi};
+
+//+
+Circle(11) = {0.75, 0.625, 0, 0.08, 0, 2*Pi};
+//+
+Circle(12) = {0.5, 0.625, 0, 0.08, 0, 2*Pi};
+//+
+Circle(13) = {0.25, 0.625, 0, 0.08, 0, 2*Pi};
+//+
+
+Circle(14) = {0.25, 0.85, 0, 0.08, 0, 2*Pi};
+//+
+Circle(15) = {0.5, 0.85, 0, 0.08, 0, 2*Pi};
+//+
+Circle(16) = {0.75, 0.85, 0, 0.08, 0, 2*Pi};
+//+
+Line Loop(2) = {14};
+//+
+Plane Surface(2) = {2};
+//+
+Line Loop(3) = {15};
+//+
+Plane Surface(3) = {3};
+//+
+Line Loop(4) = {16};
+//+
+Plane Surface(4) = {4};
+//+
+Line Loop(5) = {13};
+//+
+Plane Surface(5) = {5};
+//+
+Line Loop(6) = {12};
+//+
+Plane Surface(6) = {6};
+//+
+Line Loop(7) = {11};
+//+
+Plane Surface(7) = {7};
+//+
+Line Loop(8) = {8};
+//+
+Plane Surface(8) = {8};
+//+
+Line Loop(9) = {9};
+//+
+Plane Surface(9) = {9};
+//+
+Line Loop(10) = {10};
+//+
+Plane Surface(10) = {10};
+//+
+Line Loop(11) = {5};
+//+
+Plane Surface(11) = {11};
+//+
+Line Loop(12) = {6};
+//+
+Plane Surface(12) = {12};
+//+
+Line Loop(13) = {7};
+//+
+Plane Surface(13) = {13};
+//+
+BooleanDifference{ Surface{1}; Delete; }{ Surface{2}; Surface{3}; Surface{4}; Surface{5}; Surface{6}; Surface{7}; Surface{8}; Surface{9}; Surface{10}; Surface{11}; Surface{12}; Surface{13}; Delete; }
+//+
+Physical Line("left") = {17};
+//+
+Physical Line("bottom") = {19};
+//+
+Physical Line("right") = {20};
+//+
+Physical Line("top") = {18};
+//+
+Physical Surface("block") = {1};
+//+
+Transfinite Line {14, 15, 16, 13, 12, 11, 8, 9, 10, 5, 6, 7} = n Using Progression 1;