exhibit the problem

NonLinearEVP/NonLinearEVP.geo

@@ -64,7 +64,7 @@ If (flag_Tmesh==0)
   Line Loop(4) = {9, 10, 11, 3};
   Plane Surface(4) = {-4};
 
-  // Periodic Line { 14,18,19,20,11 } = {12,15,16,17,9 } Translate {a_lat,0,0} ;
+  Periodic Line { 14,18,19,20,11 } = {12,15,16,17,9 } Translate {a_lat,0,0} ;
 
   Physical Surface(100) = {2};   // 1 dom in
   Physical Surface(101) = {3};  // 2 dom out