[ex3] improve main file readability

exercises/exercise-fluidsystem/exercise3.cc

@@ -18,8 +18,8 @@
  *****************************************************************************/
 /*!
  * \file
- *
- * \brief DOC ME!
+ * \brief The main file for exercise 3. This solves an instationary problem
+ *        with an implicit time discretization.
  */
 #include <config.h>
 
@@ -52,35 +52,6 @@
 #include <dumux/io/vtkoutputmodule.hh>
 #include <dumux/io/grid/gridmanager.hh>
 
-/*!
- * \brief Provides an interface for customizing error messages associated with
- *        reading in parameters.
- *
- * \param progName  The name of the program, that was tried to be started.
- * \param errorMsg  The error message that was issued by the start function.
- *                  Comprises the thing that went wrong and a general help message.
- */
-void usage(const char *progName, const std::string &errorMsg)  //TODO check usage
-{
-    if (errorMsg.size() > 0) {
-        std::string errorMessageOut = "\nUsage: ";
-                    errorMessageOut += progName;
-                    errorMessageOut += " [options]\n";
-                    errorMessageOut += errorMsg;
-                    errorMessageOut += "\n\nThe list of mandatory options for this program is:\n"
-                           "\t-TimeManager.TEnd              End of the simulation [s] \n"
-                           "\t-TimeManager.DtInitial         Initial timestep size [s] \n"
-                           "\t-Grid.File                     Name of the file containing the grid \n"
-                           "\t                               definition in DGF format\n"
-                           "\t-SpatialParams.LensLowerLeft   coordinates of the lower left corner of the lens [m] \n"
-                           "\t-SpatialParams.LensUpperRight  coordinates of the upper right corner of the lens [m] \n"
-                           "\t-Problem.Name                  String for naming of the output files \n"
-                           "\n";
-        std::cout << errorMessageOut
-                  << "\n";
-    }
-}
-
 ////////////////////////
 // the main function
 ////////////////////////
@@ -103,7 +74,7 @@ int main(int argc, char** argv) try
         DumuxMessage::print(/*firstCall=*/true);
 
     // parse command line arguments and input file
-    Parameters::init(argc, argv, usage);
+    Parameters::init(argc, argv);
 
     // try to create a grid (from the given grid file or the input file)
     GridManager<typename GET_PROP_TYPE(TypeTag, Grid)> gridManager;
@@ -157,7 +128,7 @@ int main(int argc, char** argv) try
     timeLoop->setMaxTimeStepSize(maxDt);
 
     // the assembler with time loop for instationary problem
-    using Assembler = FVAssembler<TypeTag, DiffMethod::numeric>;
+    using Assembler = FVAssembler<TypeTag, DiffMethod::numeric, /*implicit?*/true>;
     auto assembler = std::make_shared<Assembler>(problem, fvGridGeometry, gridVariables, timeLoop);
 
     // the linear solver
@@ -195,11 +166,10 @@ int main(int argc, char** argv) try
 
     } while (!timeLoop->finished());
 
-    timeLoop->finalize(leafGridView.comm());
-
     ////////////////////////////////////////////////////////////
     // finalize, print dumux message to say goodbye
     ////////////////////////////////////////////////////////////
+    timeLoop->finalize(leafGridView.comm());
 
     // print dumux end message
     if (mpiHelper.rank() == 0)