[ex][model] Make solution consistent with exercise

exercises/solution/exercise-model/main.cc

@@ -45,7 +45,6 @@
 
 /*!
  * \ingroup NonlinearDiffusion
- *
  * \brief Test problem for image denoising using a nonlinear diffusion model
  */
 namespace Dumux {
@@ -56,8 +55,6 @@ class NonlinearDiffusionTestProblem : public FVProblem<TypeTag>
     using GridGeometry = GetPropType<TypeTag, Properties::GridGeometry>;
     using GridView = typename GridGeometry::GridView;
     using Element = typename GridView::template Codim<0>::Entity;
-    using FVElementGeometry = typename GridGeometry::LocalView;
-    using SubControlVolume = typename FVElementGeometry::SubControlVolume;
     using GlobalPosition = typename GridGeometry::LocalView::Element::Geometry::GlobalCoordinate;
     using Scalar = GetPropType<TypeTag, Properties::Scalar>;
     using PrimaryVariables = GetPropType<TypeTag, Properties::PrimaryVariables>;
@@ -113,7 +110,7 @@ struct NonlinearDiffusionTest
 
 
 // Create the initial solution
-// Given by normalize image pixel data
+// Given by normalized image pixel data to the range [0,1]
 template<class SolutionVector, class GridGeometry, class ImageData>
 SolutionVector createInitialSolution(const GridGeometry& gg, const ImageData& data)
 {
@@ -137,12 +134,8 @@ int main(int argc, char** argv)
     // define the type tag for this problem.
     using TypeTag = Properties::TTag::NonlinearDiffusionTest;
 
-    using Scalar = GetPropType<TypeTag, Properties::Scalar>;
     using Grid = GetPropType<TypeTag, Properties::Grid>;
     using GridGeometry = GetPropType<TypeTag, Properties::GridGeometry>;
-    using Problem = GetPropType<TypeTag, Properties::Problem>;
-    using SolutionVector = GetPropType<TypeTag, Properties::SolutionVector>;
-    using GridVariables = GetPropType<TypeTag, Properties::GridVariables>;
 
     // Read the image
     const auto imageFileName = getParam<std::string>("ImageFile");
@@ -156,6 +149,12 @@ int main(int argc, char** argv)
     // We, create the finite volume grid geometry from the (leaf) grid view,
     // the problem for the boundary conditions, a solution vector and a grid variables instance.
     auto gridGeometry = std::make_shared<GridGeometry>(gridManager.grid().leafGridView());
+
+    using Scalar = GetPropType<TypeTag, Properties::Scalar>;
+    using Problem = GetPropType<TypeTag, Properties::Problem>;
+    using SolutionVector = GetPropType<TypeTag, Properties::SolutionVector>;
+    using GridVariables = GetPropType<TypeTag, Properties::GridVariables>;
+
     auto problem = std::make_shared<Problem>(gridGeometry);
     auto sol = createInitialSolution<SolutionVector>(*gridGeometry, imageData);
     auto gridVariables = std::make_shared<GridVariables>(problem, gridGeometry);