Add option to refine the mesh in Vector FE Ex.3

Author: nmnobre

examples/vector_fe/vector_fe_ex3/vector_fe_ex3.C

@@ -31,6 +31,7 @@
 #include "libmesh/mesh.h"
 #include "libmesh/mesh_generation.h"
 #include "libmesh/mesh_modification.h"
+#include "libmesh/mesh_refinement.h"
 #include "libmesh/exact_solution.h"
 #include "libmesh/string_to_enum.h"
 #include "libmesh/enum_solver_package.h"
@@ -91,6 +92,10 @@ int main (int argc, char ** argv)
   // Make sure the code is robust against nodal reorderings.
   MeshTools::Modification::permute_elements(mesh);
 
+  // Make sure the code is robust against mesh refinements.
+  MeshRefinement mesh_refinement(mesh);
+  mesh_refinement.uniformly_refine(infile("refine", 0));
+
   // Print information about the mesh to the screen.
   mesh.print_info();