[staggered][freeflow] Fix some properties

* set the size of the BoundaryType array explicitly
* set NumEq such that it fits the value of the actual "physical" number
  of the NavierStokes equations: dim + numComponents (e.g. 4
  for a single phase single component 3D problem)
* NumEq is not used anywhere in the code at present

dumux/freeflow/properties.hh

@@ -40,7 +40,19 @@ namespace Properties
 //! Type tag for models involving flow in porous media
 NEW_TYPE_TAG(FreeFlow);
 
+SET_PROP(FreeFlow, NumEq)
+{
+private:
+    using GridView = typename GET_PROP_TYPE(TypeTag, GridView);
+    static constexpr auto dim = GridView::dimension;
+    static constexpr auto numComponents = GET_PROP_VALUE(TypeTag, NumComponents);
+public:
+    static constexpr int value = dim + numComponents;
+};
+
 SET_INT_PROP(FreeFlow, NumEqFace, 1); //!< set the number of equations to 1
+SET_INT_PROP(FreeFlow, NumEqCellCenter, 1); //!< set the number of equations to 1
+
 
 //! The sub-controlvolume face
 SET_PROP(FreeFlow, SubControlVolumeFace)
@@ -100,9 +112,14 @@ public:
 };
 
 //! Boundary types at a single degree of freedom
-SET_TYPE_PROP(FreeFlow,
-              BoundaryTypes,
-              StaggeredFreeFlowBoundaryTypes<GET_PROP_VALUE(TypeTag, NumEq)>);
+SET_PROP(FreeFlow, BoundaryTypes)
+{
+private:
+    static constexpr auto size = GET_PROP_VALUE(TypeTag, NumEqCellCenter) + GET_PROP_VALUE(TypeTag, NumEqFace);
+public:
+    using type = StaggeredFreeFlowBoundaryTypes<size>;
+};
+
 
 } // namespace Properties
 } // namespace Dumux

dumux/freeflow/staggered/properties.hh

@@ -80,8 +80,9 @@ NEW_PROP_TAG(EnergyFluxVariables); //!<  The energy flux variables
 ///////////////////////////////////////////////////////////////////////////
 // default property values for the isothermal single phase model
 ///////////////////////////////////////////////////////////////////////////
-SET_INT_PROP(NavierStokes, NumEqCellCenter, 1); //!< set the number of equations to 1
-SET_INT_PROP(NavierStokes, NumPhases, 1); //!< The number of phases in the 1p model is 1
+SET_INT_PROP(NavierStokes, NumEqCellCenter, 1); //! set the number of equations to 1
+SET_INT_PROP(NavierStokes, NumPhases, 1); //! The number of phases in the 1p model is 1
+SET_INT_PROP(NavierStokes, NumComponents, 1); //! The number of components in the 1p model is 1
 
 //! The fluid system to use by default
 SET_TYPE_PROP(NavierStokes, FluidSystem, Dumux::FluidSystems::OneP<typename GET_PROP_TYPE(TypeTag, Scalar), typename GET_PROP_TYPE(TypeTag, Fluid)>);

dumux/freeflow/staggeredni/properties.hh

@@ -58,6 +58,16 @@ public:
     static constexpr auto value = isothermalNumEqCellCenter + 1;
 };
 
+SET_PROP(NavierStokesNonIsothermal, NumEq)
+{
+private:
+    using GridView = typename GET_PROP_TYPE(TypeTag, GridView);
+    static constexpr auto dim = GridView::dimension;
+    static constexpr auto numComponents = GET_PROP_VALUE(TypeTag, NumComponents);
+public:
+    static constexpr int value = dim + numComponents + 1;
+};
+
 SET_TYPE_PROP(NavierStokesNonIsothermal, Indices, NavierStokesNonIsothermalIndices<TypeTag>);
 
 SET_TYPE_PROP(NavierStokesNonIsothermal, VtkOutputFields, FreeFlowEnergyVtkOutputFields<TypeTag>);