fix grid mmdg2

src/grids/mmdg2.geo

@@ -13,21 +13,22 @@ Point(6) = {0.5, 1, 0, lc};
 Point(7) = {0.5, 0.5, 0, lc};
 
 //domain outline
-Line(1) = {1, 2};
-Line(2) = {2, 3};
-Line(3) = {3, 4};
-Line(4) = {4, 1};
+Line(1) = {1, 5};
+Line(2) = {5, 2};
+Line(3) = {2, 3};
+Line(4) = {3, 6};
+Line(5) = {6, 4};
+Line(6) = {4, 1};
 
 //interface outline
-Line(6) = {5, 7};
-Line(7) = {7, 6};
+Line(7) = {5, 6};
 
 //curve loops
-Curve Loop(1) = {1:4}; //domain boundary
+Curve Loop(1) = {1:6}; //domain boundary
 
 //surfaces
 Plane Surface(1) = {1};
 Physical Surface(1) = {1};
 
-Curve{6:7} In Surface{1};
-Physical Curve(2) = {6:7};
+Curve{7} In Surface{1};
+Physical Curve(2) = {7};