Using the DG of order 0 for the finite volume scheme

Signed-off-by: Santiago Ospina <santiago.ospina@iup.uni-heidelberg.de>

dune/dorie/interface/transport_simulation.hh

@@ -59,7 +59,7 @@ struct TransportSimulationTraits : public BaseTraits
   using GFSaturation = GFSaturationType;
 
   /// GFS Helper
-  using GFSHelper = Dune::Dorie::LinearSolverGridFunctionSpaceHelper<GV,RF,
+  using GFSHelper = Dune::Dorie::GridFunctionSpaceHelper<GV,RF,order,
                         BaseTraits::GridGeometryType>;
   /// Problem GFS
   using GFS = typename GFSHelper::Type;

dune/dorie/interface/util.hh

@@ -105,7 +105,7 @@ public:
 	using CON = Dune::PDELab::P0ParallelConstraints;
 	/// GFS type
 	using Type = typename Dune::PDELab::GridFunctionSpace<ES,FEM,CON,
-		Dune::PDELab::ISTL::VectorBackend</*Dune::PDELab::ISTL::Blocking::fixed, 1*/>>; // FIXME: FV didn't compile with blocking
+		Dune::PDELab::ISTL::VectorBackend<Dune::PDELab::ISTL::Blocking::fixed, 1>>;
 	/// GFS Constraints Container type
 	using CC = typename Type::template ConstraintsContainer<RF>::Type;