Impose homogeneous Dirichlet condition on the top and right surfaces, instead...

Impose homogeneous Dirichlet condition on the top and right surfaces, instead of homogeneous Neumann. It's a bit more natural, amd it matches the small example in the getdp documentation.

Electrostatics/microstrip.pro

@@ -35,8 +35,9 @@
    (called "Electrode" below) and to 0 V on the ground. A homogeneous Neumann
    boundary condition (zero flux of the displacement field, i.e. n.d = 0) is
    imposed on the left boundary of the domain to account for the symmetry of the
-   problem, as well as on the top and right boundaries that truncate the
-   simulation domain. */
+   problem. The domain is truncated on the top and right with a homogeneous
+   Dirichlet boundary condition (v = 0), assumed to be imposed sufficiently far
+   away from the microstrip. */
 
 Group {
   /* One starts by giving explicit meaningful names to the Physical regions
@@ -48,6 +49,7 @@ Group {
 
   Ground = Region[120];
   Electrode = Region[121];
+  SurfInf = Region[130];
 
   /* We now define abstract regions to be used below in the definition of the
      scalar electric potential formulation:
@@ -90,6 +92,7 @@ Constraint {
     Case {
       { Region Ground; Value 0.; }
       { Region Electrode; Value 1.e-3; }
+      { Region SurfInf; Value 0; }
     }
   }
 }

ElectrostaticsFloating/floating.pro

@@ -85,11 +85,13 @@ Function {
 }
 
 Constraint {
-  /* The Dirichlet boundary condition on the local electric potential is no
-     longer used. The microstrip and the ground are herein treated as electrodes,
-     whose voltage is imposed with the "SetGlobalPotential" constraint below. */
+  /* The Dirichlet boundary condition on the local electric potential is only
+     used for the homogeneous condition on the top and right boundaries. The
+     microstrip and the ground are now treated as electrodes, whose voltage is
+     imposed with the "SetGlobalPotential" constraint below. */
   { Name Dirichlet_Ele; Type Assign;
     Case {
+      { Region SurfInf; Value 0; }
     }
   }