[test][2p] Attempt to improve the stability of the fracture tests

* Always compare the last vtu file
* Set maximum time step size lower
* Set Newton and linear solver tolerance lower

test/porousmediumflow/2p/implicit/fracture/CMakeLists.txt

 dune_symlink_to_source_files(FILES "params.input" "grids")
 
-# using box
-add_executable(test_2p_fracture_box EXCLUDE_FROM_ALL main.cc)
-target_compile_definitions(test_2p_fracture_box PUBLIC TYPETAG=FractureBox)
-
-# using tpfa
-add_executable(test_2p_fracture_tpfa EXCLUDE_FROM_ALL main.cc)
-target_compile_definitions(test_2p_fracture_tpfa PUBLIC TYPETAG=FractureCCTpfa)
-
-# using tpfa
-add_executable(test_2p_fracture_mpfa EXCLUDE_FROM_ALL main.cc)
-target_compile_definitions(test_2p_fracture_mpfa PUBLIC TYPETAG=FractureCCMpfa)
-
-# box test without gravity
-dune_add_test(NAME test_2p_fracture_nogravity_box
-              TARGET test_2p_fracture_box
+# tests without gravity
+dune_add_test(NAME test_2p_fracture_box
+              SOURCES main.cc
+              COMPILE_DEFINITIONS TYPETAG=FractureBox
               CMAKE_GUARD dune-foamgrid_FOUND
               COMMAND ${CMAKE_SOURCE_DIR}/bin/testing/runtest.py
               CMD_ARGS --script fuzzy
                        --files ${CMAKE_SOURCE_DIR}/test/references/test_2p_fracture_box-reference.vtu
-                               ${CMAKE_CURRENT_BINARY_DIR}/test_2p_fracture_box-00023.vtu
+                               ${CMAKE_CURRENT_BINARY_DIR}/test_2p_fracture_box-00001.vtu
                        --command "${CMAKE_CURRENT_BINARY_DIR}/test_2p_fracture_box params.input -Problem.Name test_2p_fracture_box")
 
-dune_add_test(NAME test_2p_fracture_nogravity_tpfa
-              TARGET test_2p_fracture_tpfa
+dune_add_test(NAME test_2p_fracture_tpfa
+              SOURCES main.cc
+              COMPILE_DEFINITIONS TYPETAG=FractureCCTpfa
               CMAKE_GUARD dune-foamgrid_FOUND
               COMMAND ${CMAKE_SOURCE_DIR}/bin/testing/runtest.py
               CMD_ARGS --script fuzzy
                        --files ${CMAKE_SOURCE_DIR}/test/references/test_2p_fracture_tpfa-reference.vtu
-                               ${CMAKE_CURRENT_BINARY_DIR}/test_2p_fracture_tpfa-00029.vtu
+                               ${CMAKE_CURRENT_BINARY_DIR}/test_2p_fracture_tpfa-00001.vtu
                        --command "${CMAKE_CURRENT_BINARY_DIR}/test_2p_fracture_tpfa params.input -Problem.Name test_2p_fracture_tpfa")
 
-dune_add_test(NAME test_2p_fracture_nogravity_mpfa
-              TARGET test_2p_fracture_mpfa
+dune_add_test(NAME test_2p_fracture_mpfa
+              SOURCES main.cc
+              COMPILE_DEFINITIONS TYPETAG=FractureCCMpfa
               CMAKE_GUARD dune-foamgrid_FOUND
               COMMAND ${CMAKE_SOURCE_DIR}/bin/testing/runtest.py
               CMD_ARGS --script fuzzy
                        --files ${CMAKE_SOURCE_DIR}/test/references/test_2p_fracture_mpfa-reference.vtu
-                               ${CMAKE_CURRENT_BINARY_DIR}/test_2p_fracture_mpfa-00030.vtu
+                               ${CMAKE_CURRENT_BINARY_DIR}/test_2p_fracture_mpfa-00001.vtu
                        --command "${CMAKE_CURRENT_BINARY_DIR}/test_2p_fracture_mpfa params.input -Problem.Name test_2p_fracture_mpfa")
 
 # tests with gravity
@@ -47,7 +38,7 @@ dune_add_test(NAME test_2p_fracture_gravity_box
               COMMAND ${CMAKE_SOURCE_DIR}/bin/testing/runtest.py
               CMD_ARGS --script fuzzy
                        --files ${CMAKE_SOURCE_DIR}/test/references/test_2p_fracture_gravity_box-reference.vtu
-                               ${CMAKE_CURRENT_BINARY_DIR}/test_2p_fracture_gravity_box-00028.vtu
+                               ${CMAKE_CURRENT_BINARY_DIR}/test_2p_fracture_gravity_box-00001.vtu
                        --command "${CMAKE_CURRENT_BINARY_DIR}/test_2p_fracture_box params.input -Problem.Name test_2p_fracture_gravity_box -Problem.EnableGravity true")
 
 dune_add_test(NAME test_2p_fracture_gravity_tpfa
@@ -56,7 +47,7 @@ dune_add_test(NAME test_2p_fracture_gravity_tpfa
               COMMAND ${CMAKE_SOURCE_DIR}/bin/testing/runtest.py
               CMD_ARGS --script fuzzy
                        --files ${CMAKE_SOURCE_DIR}/test/references/test_2p_fracture_gravity_tpfa-reference.vtu
-                               ${CMAKE_CURRENT_BINARY_DIR}/test_2p_fracture_gravity_tpfa-00042.vtu
+                               ${CMAKE_CURRENT_BINARY_DIR}/test_2p_fracture_gravity_tpfa-00001.vtu
                        --command "${CMAKE_CURRENT_BINARY_DIR}/test_2p_fracture_tpfa params.input -Problem.Name test_2p_fracture_gravity_tpfa -Problem.EnableGravity true")
 
 dune_add_test(NAME test_2p_fracture_gravity_mpfa
@@ -65,7 +56,7 @@ dune_add_test(NAME test_2p_fracture_gravity_mpfa
               COMMAND ${CMAKE_SOURCE_DIR}/bin/testing/runtest.py
               CMD_ARGS --script fuzzy
                        --files ${CMAKE_SOURCE_DIR}/test/references/test_2p_fracture_gravity_mpfa-reference.vtu
-                               ${CMAKE_CURRENT_BINARY_DIR}/test_2p_fracture_gravity_mpfa-00042.vtu
+                               ${CMAKE_CURRENT_BINARY_DIR}/test_2p_fracture_gravity_mpfa-00001.vtu
                        --command "${CMAKE_CURRENT_BINARY_DIR}/test_2p_fracture_mpfa params.input -Problem.Name test_2p_fracture_gravity_mpfa -Problem.EnableGravity true")
 
 set(CMAKE_BUILD_TYPE Release)

test/porousmediumflow/2p/implicit/fracture/main.cc

@@ -128,8 +128,9 @@ int main(int argc, char** argv) try
     vtkWriter.write(0.0);
 
     // instantiate time loop
-    auto timeLoop = std::make_shared<TimeLoop<Scalar>>(0, dt, tEnd);
+    auto timeLoop = std::make_shared<CheckPointTimeLoop<Scalar>>(0, dt, tEnd);
     timeLoop->setMaxTimeStepSize(maxDt);
+    timeLoop->setPeriodicCheckPoint(getParam<Scalar>("TimeLoop.PeriodicCheckPoint"));
 
     // the assembler with time loop for instationary problem
     using Assembler = FVAssembler<TypeTag, DiffMethod::numeric>;
@@ -160,7 +161,8 @@ int main(int argc, char** argv) try
         timeLoop->advanceTimeStep();
 
         // write vtk output
-        vtkWriter.write(timeLoop->time());
+        if (timeLoop->isCheckPoint() || timeLoop->finished())
+            vtkWriter.write(timeLoop->time());
 
         // report statistics of this time step
         timeLoop->reportTimeStep();

test/porousmediumflow/2p/implicit/fracture/params.input

 [TimeLoop]
 DtInitial = 250 # [s]
 TEnd = 300000 # [s]
+MaxTimeStepSize = 10000 # [s]
+PeriodicCheckPoint = 300000 # [s]
 
 [Grid]
 File = grids/fracture.msh
@@ -8,3 +10,9 @@ File = grids/fracture.msh
 [Problem]
 Name = fracture
 EnableGravity = false
+
+[LinearSolver]
+ResidualReduction = 1e-16
+
+[Newton]
+MaxRelativeShift = 1e-10

test/porousmediumflow/2p/implicit/fracture/problem.hh

@@ -148,6 +148,17 @@ public:
     Scalar temperature() const
     { return 273.15 + 20; }
 
+    /*!
+     * \brief Specifies which kind of boundary condition should be
+     *        used for which equation on a given boundary segment.
+     *
+     * \param globalPos The global position where to set the BC types
+     */
+    Scalar extrusionFactorAtPos(const GlobalPosition &globalPos) const
+    {
+        return 0.1;
+    }
+
     // \}
 
     /*!