Added files for Backward step.

flow-stability/bfs/flow-stability-bfs/completed/geometry/bfs.geo

+lcStep  = 0.13;
+lcStep2 = 0.27;
+lcInflow= 0.5;
+lcFar   = 0.5;
+
+Point(1) = {0,0,0,lcStep};
+Point(2) = {0,-1,0,lcStep2};
+Point(3) = {50,-1,0,lcFar};
+Point(4) = {50,1,0,lcFar};
+Point(5) = {-10,1,0,lcInflow};
+Point(6) = {-10,0,0,lcInflow};
+
+Point(10) = {-0.5,0,0,lcInflow};
+Point(11) = {-0.5,1,0,lcInflow};
+Point(12) = {3,-1,0,lcFar};
+Point(13) = {3,1,0,lcFar};
+
+Line(110) = {1,2};
+Line(111) = {2,12};
+Line(112) = {12,13};
+Line(113) = {13,11};
+Line(114) = {11,10};
+Line(115) = {10,1};
+
+Line(116) = {12,3};
+Line(117) = {3,4};
+Line(118) = {4,13};
+Line(119) = {11,5};
+Line(120) = {5,6};
+Line(121) = {6,10};
+
+Line Loop(220) = {110,111,112,113,114,115};
+Line Loop(221) = {116,117,118,-112};
+Line Loop(222) = {119,120,121,-114};
+
+Transfinite Line{116,-118} = 45 Using Progression 1.025;
+Transfinite Line{112,117,120,114} = 5 Using Bump 0.1;
+Transfinite Line{119,-121} = 12 Using Progression 1.15;
+
+Field[1] = Box;
+Field[1].VIn = lcStep;
+Field[1].VOut = lcFar;
+Field[1].XMax = 1.5;
+Field[1].XMin = -0.2;
+Field[1].YMin = -0.3;
+Field[1].YMax = 0.2;
+Field[1].ZMin = 0;
+Field[1].ZMax = 0;
+
+Field[2] = Box;
+Field[2].VIn = lcStep2;
+Field[2].VOut = lcFar;
+Field[2].XMax = 3;
+Field[2].XMin = -0.3;
+Field[2].YMin = 0.95;
+Field[2].YMax = 1;
+Field[2].ZMin = 0;
+Field[2].ZMax = 0;
+
+Field[3] = Box;
+Field[3].VIn = lcStep2;
+Field[3].VOut = lcFar;
+Field[3].XMax = 3;
+Field[3].XMin = 0;
+Field[3].YMin = -1;
+Field[3].YMax = -0.95;
+Field[3].ZMin = 0;
+Field[3].ZMax = 0;
+
+Field[4] = Min;
+Field[4].FieldsList = {1,2,3};
+
+Background Field = 4;
+
+Plane Surface(330) = {220};
+Plane Surface(331) = {221};
+Plane Surface(332) = {222};
+Transfinite Surface{331} = {12,3,4,13};
+Transfinite Surface{332} = {11,5,6,10};
+
+//Recombine Surface{330};
+Recombine Surface{331};
+Recombine Surface{332};
+//Mesh.SubdivisionAlgorithm=2;
+//Mesh.Triangles=1;
+
+Physical Surface(0) = {330};
+Physical Surface(1) = {332, 331};
+Physical Line(2) = {119, 113, 118, 121, 115, 110, 111, 116};
+Physical Line(3) = {120};
+Physical Line(4) = {117};