move GridFile to TypeTag-free parameter system

examples/problems/infiltrationproblem.hh

@@ -105,11 +105,6 @@ struct EndTime<TypeTag, Properties::TTag::InfiltrationBaseProblem>
     static constexpr type value = 6e3;
 };
 
-// The default DGF file to load
-template<class TypeTag>
-struct GridFile<TypeTag, Properties::TTag::InfiltrationBaseProblem>
-{ static constexpr auto value = "./data/infiltration_50x3.dgf"; };
-
 // The default for the initial time step size of the simulation
 template<class TypeTag>
 struct InitialTimeStepSize<TypeTag, Properties::TTag::InfiltrationBaseProblem>
@@ -244,6 +239,16 @@ public:
         materialParams_.checkDefined();
     }
 
+    /*!
+     * \copydoc FvBaseMultiPhaseProblem::registerParameters
+     */
+    static void registerParameters()
+    {
+        ParentType::registerParameters();
+
+        Parameters::SetDefault<Parameters::GridFile>("./data/infiltration_50x3.dgf");
+    }
+
     /*!
      * \name Problem parameters
      */