move Cells(X|Y|Z) to TypeTag-free parameter system

examples/tutorial1problem.hh

@@ -124,19 +124,6 @@ public:
 
 namespace Opm::Parameters {
 
-// // define the number of cells used for discretizing the physical domain
-template<class TypeTag>
-struct CellsX<TypeTag, Properties::TTag::Tutorial1Problem>
-{ static constexpr unsigned value = 100; };
-
-template<class TypeTag>
-struct CellsY<TypeTag, Properties::TTag::Tutorial1Problem>
-{ static constexpr unsigned value = 1; };
-
-template<class TypeTag>
-struct CellsZ<TypeTag, Properties::TTag::Tutorial1Problem>
-{ static constexpr unsigned value = 1; }; /*@\label{tutorial1:default-params-end}@*/
-
 // define the physical size of the problem's domain [m]
 template<class TypeTag>
 struct DomainSizeX<TypeTag, Properties::TTag::Tutorial1Problem>
@@ -193,7 +180,10 @@ class Tutorial1Problem
     using GridView = GetPropType<TypeTag, Properties::GridView>;
 
     // Grid dimension
-    enum { dimWorld = GridView::dimensionworld };
+    enum {
+        dim = GridView::dimension,
+        dimWorld = GridView::dimensionworld
+    };
 
     // The type of the intrinsic permeability tensor
     using DimMatrix = Dune::FieldMatrix<Scalar, dimWorld, dimWorld>;
@@ -247,6 +237,21 @@ public:
         materialParams_.finalize();
     }
 
+    /*!
+     * \copydoc FvBaseMultiPhaseProblem::registerParameters
+     */
+    static void registerParameters()
+    {
+        ParentType::registerParameters();
+
+        Parameters::SetDefault<Parameters::CellsX>(100);
+        Parameters::SetDefault<Parameters::CellsY>(1);
+
+        if constexpr (dim == 3) {
+            Parameters::SetDefault<Parameters::CellsZ>(1);
+        }
+    }
+
     //! Specifies the problem name. This is used for files generated by the simulation.
     std::string name() const
     { return "tutorial1"; }