From 8926b2fb0480c5f0e5f9b3ed0703045373b169e5 Mon Sep 17 00:00:00 2001
From: Kilian Weishaupt <kilian.weishaupt@iws.uni-stuttgart.de>
Date: Sat, 18 Feb 2017 16:55:00 +0100
Subject: [PATCH] [staggeredGrid][NavierStokesNC] Add new test

*Pure diffusion: no advective fluxes expected
*Advection
*Density driven flow with gravity
---
 test/freeflow/staggerednc/CMakeLists.txt      |  30 +-
 .../staggerednc/channeltestproblem.hh         |  78 +-
 .../staggerednc/densityflowproblem.hh         | 269 ++++++
 .../freeflow/staggerednc/test_advection.input |  19 +
 test/freeflow/staggerednc/test_channel.cc     |   4 +-
 .../staggerednc/test_channel_stokes.input     |  20 -
 .../staggerednc/test_densitydrivenflow.cc     |  64 ++
 .../staggerednc/test_densitydrivenflow.input  |  19 +
 .../staggerednc/test_purediffusion.input      |  19 +
 test/references/stokes2c-advection.vtu        | 892 ++++++++++++++++++
 .../stokes2c-densitydriven-reference.vtu      | 724 ++++++++++++++
 test/references/stokes2c-purediffusion.vtu    | 892 ++++++++++++++++++
 12 files changed, 2951 insertions(+), 79 deletions(-)
 create mode 100644 test/freeflow/staggerednc/densityflowproblem.hh
 create mode 100644 test/freeflow/staggerednc/test_advection.input
 delete mode 100644 test/freeflow/staggerednc/test_channel_stokes.input
 create mode 100644 test/freeflow/staggerednc/test_densitydrivenflow.cc
 create mode 100644 test/freeflow/staggerednc/test_densitydrivenflow.input
 create mode 100644 test/freeflow/staggerednc/test_purediffusion.input
 create mode 100644 test/references/stokes2c-advection.vtu
 create mode 100644 test/references/stokes2c-densitydriven-reference.vtu
 create mode 100644 test/references/stokes2c-purediffusion.vtu

diff --git a/test/freeflow/staggerednc/CMakeLists.txt b/test/freeflow/staggerednc/CMakeLists.txt
index 9aa0dac746..5e7e43213b 100644
--- a/test/freeflow/staggerednc/CMakeLists.txt
+++ b/test/freeflow/staggerednc/CMakeLists.txt
@@ -1,17 +1,31 @@
 add_input_file_links()
 
-add_dumux_test(test_channel_stokes_nc test_channel_stokes_nc test_channel.cc
+add_dumux_test(test_densitydrivenflow test_densitydrivenflow test_densitydrivenflow.cc
                python ${CMAKE_SOURCE_DIR}/bin/testing/runtest.py
                  --script fuzzy
-                 --files ${CMAKE_SOURCE_DIR}/test/references/channel-stokes.vtu
-                         ${CMAKE_CURRENT_BINARY_DIR}/test_channel_stokes-00002.vtu
-                 --command "${CMAKE_CURRENT_BINARY_DIR}/test_channel_stokes")
+                 --files ${CMAKE_SOURCE_DIR}/test/references/stokes2c-densitydriven-reference.vtu
+                         ${CMAKE_CURRENT_BINARY_DIR}/test_densitydrivenflow-00013.vtu
+                 --command "${CMAKE_CURRENT_BINARY_DIR}/test_densitydrivenflow")
+
+add_dumux_test(test_purediffusion test_channel test_channel.cc
+               python ${CMAKE_SOURCE_DIR}/bin/testing/runtest.py
+                 --script fuzzy
+                 --files ${CMAKE_SOURCE_DIR}/test/references/stokes2c-purediffusion.vtu
+                         ${CMAKE_CURRENT_BINARY_DIR}/test_purediffusion-00013.vtu
+                 --command "${CMAKE_CURRENT_BINARY_DIR}/test_channel test_purediffusion.input")
+
+add_dumux_test(test_advection test_channel test_channel.cc
+               python ${CMAKE_SOURCE_DIR}/bin/testing/runtest.py
+                 --script fuzzy
+                 --files ${CMAKE_SOURCE_DIR}/test/references/stokes2c-advection.vtu
+                         ${CMAKE_CURRENT_BINARY_DIR}/test_advection-00011.vtu
+                 --command "${CMAKE_CURRENT_BINARY_DIR}/test_channel test_advection.input")
 
 
 #install sources
 install(FILES
-channeltestproblem.hh
+test_densitydrivenflow.cc
+densityflowproblem.hh
 test_channel.cc
-closedsystemtestproblem.hh
-test_closedsystem.cc
-DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/dumux/test/freeflow/staggered)
+channeltestproblem.hh
+DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/dumux/test/freeflow/staggerednc)
diff --git a/test/freeflow/staggerednc/channeltestproblem.hh b/test/freeflow/staggerednc/channeltestproblem.hh
index ec0f0b7162..e5f6102cc6 100644
--- a/test/freeflow/staggerednc/channeltestproblem.hh
+++ b/test/freeflow/staggerednc/channeltestproblem.hh
@@ -19,7 +19,7 @@
 /*!
  * \file
  *
- * \brief Channel flow test for the staggered grid (Navier-)Stokes model
+ * \brief Channel flow test for the multi-component staggered grid (Navier-)Stokes model
  */
 #ifndef DUMUX_CHANNEL_NC_TEST_PROBLEM_HH
 #define DUMUX_CHANNEL_NC_TEST_PROBLEM_HH
@@ -28,62 +28,60 @@
 #include <dumux/freeflow/staggerednc/model.hh>
 #include <dumux/implicit/problem.hh>
 #include <dumux/material/components/simpleh2o.hh>
-#include <dumux/material/fluidsystems/liquidphase.hh>
-#include <dumux/material/components/constant.hh>
 
 #include <dumux/material/fluidsystems/h2oair.hh>
 
 namespace Dumux
 {
 template <class TypeTag>
-class ChannelTestProblem;
+class ChannelNCTestProblem;
 
 namespace Capabilities
 {
     template<class TypeTag>
-    struct isStationary<ChannelTestProblem<TypeTag>>
+    struct isStationary<ChannelNCTestProblem<TypeTag>>
     { static const bool value = false; };
 }
 
 namespace Properties
 {
-NEW_TYPE_TAG(ChannelTestProblem, INHERITS_FROM(StaggeredModel, NavierStokesNC));
+NEW_TYPE_TAG(ChannelNCTestProblem, INHERITS_FROM(StaggeredModel, NavierStokesNC));
 
 NEW_PROP_TAG(FluidSystem);
 
 // Select the fluid system
-SET_TYPE_PROP(ChannelTestProblem, FluidSystem,
+SET_TYPE_PROP(ChannelNCTestProblem, FluidSystem,
               FluidSystems::H2OAir<typename GET_PROP_TYPE(TypeTag, Scalar)/*, SimpleH2O<typename GET_PROP_TYPE(TypeTag, Scalar)>, false*/>);
 
-SET_PROP(ChannelTestProblem, PhaseIdx)
+SET_PROP(ChannelNCTestProblem, PhaseIdx)
 {
 private:
     using FluidSystem = typename GET_PROP_TYPE(TypeTag, FluidSystem);
 public:
-    static constexpr int value = 0;//FluidSystem::wPhaseIdx;
+    static constexpr int value = FluidSystem::wPhaseIdx;
 };
 
-SET_INT_PROP(ChannelTestProblem, ReplaceCompEqIdx, 0);
+SET_INT_PROP(ChannelNCTestProblem, ReplaceCompEqIdx, 0);
 
 // Set the grid type
-SET_TYPE_PROP(ChannelTestProblem, Grid, Dune::YaspGrid<2>);
+SET_TYPE_PROP(ChannelNCTestProblem, Grid, Dune::YaspGrid<2>);
 
 // Set the problem property
-SET_TYPE_PROP(ChannelTestProblem, Problem, Dumux::ChannelTestProblem<TypeTag> );
+SET_TYPE_PROP(ChannelNCTestProblem, Problem, Dumux::ChannelNCTestProblem<TypeTag> );
 
-SET_BOOL_PROP(ChannelTestProblem, EnableGlobalFVGeometryCache, true);
+SET_BOOL_PROP(ChannelNCTestProblem, EnableGlobalFVGeometryCache, true);
 
-SET_BOOL_PROP(ChannelTestProblem, EnableGlobalFluxVariablesCache, true);
-SET_BOOL_PROP(ChannelTestProblem, EnableGlobalVolumeVariablesCache, true);
+SET_BOOL_PROP(ChannelNCTestProblem, EnableGlobalFluxVariablesCache, true);
+SET_BOOL_PROP(ChannelNCTestProblem, EnableGlobalVolumeVariablesCache, true);
 
 // Enable gravity
-SET_BOOL_PROP(ChannelTestProblem, ProblemEnableGravity, true);
-SET_BOOL_PROP(ChannelTestProblem, UseMoles, true);
+SET_BOOL_PROP(ChannelNCTestProblem, ProblemEnableGravity, true);
+SET_BOOL_PROP(ChannelNCTestProblem, UseMoles, true);
 
 #if ENABLE_NAVIERSTOKES
-SET_BOOL_PROP(ChannelTestProblem, EnableInertiaTerms, true);
+SET_BOOL_PROP(ChannelNCTestProblem, EnableInertiaTerms, true);
 #else
-SET_BOOL_PROP(ChannelTestProblem, EnableInertiaTerms, false);
+SET_BOOL_PROP(ChannelNCTestProblem, EnableInertiaTerms, false);
 #endif
 }
 
@@ -92,7 +90,7 @@ SET_BOOL_PROP(ChannelTestProblem, EnableInertiaTerms, false);
    \todo doc me!
  */
 template <class TypeTag>
-class ChannelTestProblem : public NavierStokesProblem<TypeTag>
+class ChannelNCTestProblem : public NavierStokesProblem<TypeTag>
 {
     typedef NavierStokesProblem<TypeTag> ParentType;
 
@@ -139,7 +137,7 @@ class ChannelTestProblem : public NavierStokesProblem<TypeTag>
     using SourceValues = typename GET_PROP_TYPE(TypeTag, BoundaryValues);
 
 public:
-    ChannelTestProblem(TimeManager &timeManager, const GridView &gridView)
+    ChannelNCTestProblem(TimeManager &timeManager, const GridView &gridView)
     : ParentType(timeManager, gridView)
     {
         name_ = GET_RUNTIME_PARAM_FROM_GROUP(TypeTag,
@@ -151,12 +149,6 @@ public:
                                              Scalar,
                                              Problem,
                                              InletVelocity);
-
-        std::cout << "Indices: " << std::endl;
-        std::cout << "massBalanceIdx: " << massBalanceIdx << std::endl;
-        std::cout << "pressureIdx: " << pressureIdx << std::endl;
-        std::cout << "transportCompIdx: " << transportCompIdx << std::endl;
-
         FluidSystem::init();
     }
 
@@ -217,20 +209,16 @@ public:
         values.setDirichlet(momentumBalanceIdx);
         values.setNeumann(transportEqIdx);
         values.setNeumann(massBalanceIdx);
-        // values.setDirichlet(1);
 
-//         set a fixed pressure in one cell
+        if(isInlet(globalPos))
+            values.setDirichlet(transportEqIdx);
+
         if (isOutlet(globalPos))
         {
             values.setDirichlet(massBalanceIdx);
-//             values.setOutflow(momentumBalanceIdx);
-//             values.setOutflow(transportEqIdx);
+            values.setOutflow(momentumBalanceIdx);
+            values.setOutflow(transportEqIdx);
         }
-// //         else
-//             values.setNeumann(massBalanceIdx);
-
-        if(isInlet(globalPos))
-            values.setDirichlet(transportEqIdx);
 
         return values;
     }
@@ -246,23 +234,14 @@ public:
         BoundaryValues values;
 
         values[pressureIdx] = 1.1e+5;
+        values[transportCompIdx] = 1e-3;
 
         if(isInlet(globalPos))
-        {
             values[velocityXIdx] = inletVelocity_;
-            values[velocityYIdx] = 0.0;
-            values[transportCompIdx] =1e-3;
-        }
-        else if(isWall(globalPos))
-        {
+        else
             values[velocityXIdx] = 0.0;
-            values[velocityYIdx] = 0.0;
-        }
-        else if(isOutlet(globalPos))
-        {
-            values[velocityXIdx] = 1.0;
-            values[velocityYIdx]= 0.0;
-        }
+
+        values[velocityYIdx] = 0.0;
 
         return values;
     }
@@ -283,6 +262,7 @@ public:
     {
         InitialValues values;
         values[pressureIdx] = 1.1e+5;
+        values[transportCompIdx] = 0.0;
         values[velocityXIdx] = 0.0;
         values[velocityYIdx] = 0.0;
 
diff --git a/test/freeflow/staggerednc/densityflowproblem.hh b/test/freeflow/staggerednc/densityflowproblem.hh
new file mode 100644
index 0000000000..9f3e677f55
--- /dev/null
+++ b/test/freeflow/staggerednc/densityflowproblem.hh
@@ -0,0 +1,269 @@
+// -*- mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+// vi: set et ts=4 sw=4 sts=4:
+/*****************************************************************************
+ *   See the file COPYING for full copying permissions.                      *
+ *                                                                           *
+ *   This program is free software: you can redistribute it and/or modify    *
+ *   it under the terms of the GNU General Public License as published by    *
+ *   the Free Software Foundation, either version 2 of the License, or       *
+ *   (at your option) any later version.                                     *
+ *                                                                           *
+ *   This program is distributed in the hope that it will be useful,         *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of          *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the            *
+ *   GNU General Public License for more details.                            *
+ *                                                                           *
+ *   You should have received a copy of the GNU General Public License       *
+ *   along with this program.  If not, see <http://www.gnu.org/licenses/>.   *
+ *****************************************************************************/
+/*!
+ * \file
+ *
+ * \brief Channel flow test for the staggered grid (Navier-)Stokes model
+ */
+#ifndef DUMUX_DENSITY_FLOW_NC_TEST_PROBLEM_HH
+#define DUMUX_DENSITY_FLOW_NC_TEST_PROBLEM_HH
+
+#include <dumux/implicit/staggered/properties.hh>
+#include <dumux/freeflow/staggerednc/model.hh>
+#include <dumux/implicit/problem.hh>
+#include <dumux/material/components/simpleh2o.hh>
+
+#include <dumux/material/fluidsystems/h2oair.hh>
+
+namespace Dumux
+{
+template <class TypeTag>
+class DensityDrivenFlowProblem;
+
+namespace Capabilities
+{
+    template<class TypeTag>
+    struct isStationary<DensityDrivenFlowProblem<TypeTag>>
+    { static const bool value = false; };
+}
+
+namespace Properties
+{
+NEW_TYPE_TAG(DensityDrivenFlowProblem, INHERITS_FROM(StaggeredModel, NavierStokesNC));
+
+NEW_PROP_TAG(FluidSystem);
+
+// Select the fluid system
+SET_TYPE_PROP(DensityDrivenFlowProblem, FluidSystem,
+              FluidSystems::H2OAir<typename GET_PROP_TYPE(TypeTag, Scalar)/*, SimpleH2O<typename GET_PROP_TYPE(TypeTag, Scalar)>, false*/>);
+
+SET_PROP(DensityDrivenFlowProblem, PhaseIdx)
+{
+private:
+    using FluidSystem = typename GET_PROP_TYPE(TypeTag, FluidSystem);
+public:
+    static constexpr int value = FluidSystem::wPhaseIdx;
+};
+
+SET_INT_PROP(DensityDrivenFlowProblem, ReplaceCompEqIdx, 0);
+
+// Set the grid type
+SET_TYPE_PROP(DensityDrivenFlowProblem, Grid, Dune::YaspGrid<2>);
+
+// Set the problem property
+SET_TYPE_PROP(DensityDrivenFlowProblem, Problem, Dumux::DensityDrivenFlowProblem<TypeTag> );
+
+SET_BOOL_PROP(DensityDrivenFlowProblem, EnableGlobalFVGeometryCache, true);
+
+SET_BOOL_PROP(DensityDrivenFlowProblem, EnableGlobalFluxVariablesCache, true);
+SET_BOOL_PROP(DensityDrivenFlowProblem, EnableGlobalVolumeVariablesCache, true);
+
+// Enable gravity
+SET_BOOL_PROP(DensityDrivenFlowProblem, ProblemEnableGravity, true);
+SET_BOOL_PROP(DensityDrivenFlowProblem, UseMoles, true);
+
+#if ENABLE_NAVIERSTOKES
+SET_BOOL_PROP(DensityDrivenFlowProblem, EnableInertiaTerms, true);
+#else
+SET_BOOL_PROP(DensityDrivenFlowProblem, EnableInertiaTerms, false);
+#endif
+}
+
+/*!
+ * \brief  Test problem for the one-phase model:
+   \todo doc me!
+ */
+template <class TypeTag>
+class DensityDrivenFlowProblem : public NavierStokesProblem<TypeTag>
+{
+    typedef NavierStokesProblem<TypeTag> ParentType;
+
+    typedef typename GET_PROP_TYPE(TypeTag, GridView) GridView;
+    typedef typename GET_PROP_TYPE(TypeTag, Scalar) Scalar;
+    using FluidSystem = typename GET_PROP_TYPE(TypeTag, FluidSystem);
+
+    // copy some indices for convenience
+    typedef typename GET_PROP_TYPE(TypeTag, Indices) Indices;
+    enum {
+        // Grid and world dimension
+        dim = GridView::dimension,
+        dimWorld = GridView::dimensionworld
+    };
+    enum {
+        massBalanceIdx = Indices::massBalanceIdx,
+        transportEqIdx = 1,
+        momentumBalanceIdx = Indices::momentumBalanceIdx,
+        momentumXBalanceIdx = Indices::momentumXBalanceIdx,
+        momentumYBalanceIdx = Indices::momentumYBalanceIdx,
+        pressureIdx = Indices::pressureIdx,
+        velocityXIdx = Indices::velocityXIdx,
+        velocityYIdx = Indices::velocityYIdx,
+        transportCompIdx = 1/*FluidSystem::wCompIdx*/
+    };
+
+    typedef typename GET_PROP_TYPE(TypeTag, BoundaryTypes) BoundaryTypes;
+    typedef typename GET_PROP_TYPE(TypeTag, TimeManager) TimeManager;
+
+    typedef typename GridView::template Codim<0>::Entity Element;
+    typedef typename GridView::Intersection Intersection;
+
+    typedef typename GET_PROP_TYPE(TypeTag, FVElementGeometry) FVElementGeometry;
+    typedef typename GET_PROP_TYPE(TypeTag, SubControlVolume) SubControlVolume;
+
+    typedef Dune::FieldVector<Scalar, dimWorld> GlobalPosition;
+
+
+    using CellCenterPrimaryVariables = typename GET_PROP_TYPE(TypeTag, CellCenterPrimaryVariables);
+    using FacePrimaryVariables = typename GET_PROP_TYPE(TypeTag, FacePrimaryVariables);
+
+    using BoundaryValues = typename GET_PROP_TYPE(TypeTag, BoundaryValues);
+    using InitialValues = typename GET_PROP_TYPE(TypeTag, BoundaryValues);
+    using SourceValues = typename GET_PROP_TYPE(TypeTag, BoundaryValues);
+
+public:
+    DensityDrivenFlowProblem(TimeManager &timeManager, const GridView &gridView)
+    : ParentType(timeManager, gridView)
+    {
+        name_ = GET_RUNTIME_PARAM_FROM_GROUP(TypeTag,
+                                             std::string,
+                                             Problem,
+                                             Name);
+
+        FluidSystem::init();
+    }
+
+    /*!
+     * \name Problem parameters
+     */
+    // \{
+
+    /*!
+     * \brief The problem name.
+     *
+     * This is used as a prefix for files generated by the simulation.
+     */
+    std::string name() const
+    {
+        return name_;
+    }
+
+    bool shouldWriteRestartFile() const
+    {
+        return false;
+    }
+
+    /*!
+     * \brief Return the temperature within the domain in [K].
+     *
+     * This problem assumes a temperature of 10 degrees Celsius.
+     */
+    Scalar temperature() const
+    { return 273.15 + 10; } // 10C
+
+    /*!
+     * \brief Return the sources within the domain.
+     *
+     * \param globalPos The global position
+     */
+    SourceValues sourceAtPos(const GlobalPosition &globalPos) const
+    {
+        return SourceValues(0.0);
+    }
+    // \}
+    /*!
+     * \name Boundary conditions
+     */
+    // \{
+
+    /*!
+     * \brief Specifies which kind of boundary condition should be
+     *        used for which equation on a given boundary control volume.
+     *
+     * \param globalPos The position of the center of the finite volume
+     */
+    BoundaryTypes boundaryTypesAtPos(const GlobalPosition &globalPos) const
+    {
+        BoundaryTypes values;
+
+        // set Dirichlet values for the velocity everywhere
+        values.setDirichlet(momentumBalanceIdx);
+        values.setNeumann(transportEqIdx);
+        values.setNeumann(massBalanceIdx);
+
+        if(globalPos[1] <  eps_)
+            values.setDirichlet(massBalanceIdx);
+
+        if(globalPos[1] > this->bBoxMax()[1] - eps_ && globalPos[0] > 0.4 && globalPos[0] < 0.6)
+        {
+            values.setDirichlet(transportEqIdx);
+        }
+
+        return values;
+    }
+
+    /*!
+     * \brief Evaluate the boundary conditions for a dirichlet
+     *        control volume.
+     *
+     * \param globalPos The center of the finite volume which ought to be set.
+     */
+    BoundaryValues dirichletAtPos(const GlobalPosition &globalPos) const
+    {
+        BoundaryValues values;
+
+        values[pressureIdx] = 1.1e+5;
+        values[transportCompIdx] = 1e-3;
+        values[velocityXIdx] = 0.0;
+        values[velocityYIdx] = 0.0;
+
+        return values;
+    }
+
+    // \}
+
+    /*!
+     * \name Volume terms
+     */
+    // \{
+
+    /*!
+     * \brief Evaluate the initial value for a control volume.
+     *
+     * \param globalPos The global position
+     */
+    InitialValues initialAtPos(const GlobalPosition &globalPos) const
+    {
+        InitialValues values;
+        values[pressureIdx] = 1.1e+5;
+        values[transportCompIdx] = 0.0;
+        values[velocityXIdx] = 0.0;
+        values[velocityYIdx] = 0.0;
+
+        return values;
+    }
+
+    // \}
+
+private:
+    const Scalar eps_{1e-6};
+    std::string name_;
+};
+} //end namespace
+
+#endif
diff --git a/test/freeflow/staggerednc/test_advection.input b/test/freeflow/staggerednc/test_advection.input
new file mode 100644
index 0000000000..a7a1ec4322
--- /dev/null
+++ b/test/freeflow/staggerednc/test_advection.input
@@ -0,0 +1,19 @@
+[TimeManager]
+DtInitial = 1e-1 # [s]
+TEnd = 5 # [s]
+
+[Grid]
+UpperRight = 5 1
+Cells = 50 10
+
+[Problem]
+Name = test_advection # name passed to the output routines
+InletVelocity = 1
+EnableGravity = false
+
+[ Newton ]
+MaxSteps = 10
+MaxRelativeShift = 1e-8
+
+[Vtk]
+WriteFaceData = false
diff --git a/test/freeflow/staggerednc/test_channel.cc b/test/freeflow/staggerednc/test_channel.cc
index 9e6fef3863..ab0ed70cf8 100644
--- a/test/freeflow/staggerednc/test_channel.cc
+++ b/test/freeflow/staggerednc/test_channel.cc
@@ -19,7 +19,7 @@
 /*!
  * \file
  *
- * \brief Channel flow test for the staggered grid (Navier-)Stokes model
+ * \brief Test for the staggered grid multi-component (Navier-)Stokes model
  */
 #include <config.h>
 #include "channeltestproblem.hh"
@@ -59,6 +59,6 @@ void usage(const char *progName, const std::string &errorMsg)
 
 int main(int argc, char** argv)
 {
-    typedef TTAG(ChannelTestProblem) ProblemTypeTag;
+    typedef TTAG(ChannelNCTestProblem) ProblemTypeTag;
     return Dumux::start<ProblemTypeTag>(argc, argv, usage);
 }
diff --git a/test/freeflow/staggerednc/test_channel_stokes.input b/test/freeflow/staggerednc/test_channel_stokes.input
deleted file mode 100644
index fc4f25ebf9..0000000000
--- a/test/freeflow/staggerednc/test_channel_stokes.input
+++ /dev/null
@@ -1,20 +0,0 @@
-[TimeManager]
-DtInitial = 1e-3 # [s]
-TEnd = 2 # [s]
-
-[Grid]
-UpperRight = 10 1
-Cells = 10 10
-
-[Problem]
-Name = test_channel_stokes # name passed to the output routines
-InletVelocity = 1
-LiquidDensity = 1
-EnableGravity = false
-
-[ Newton ]
-MaxSteps = 10
-MaxRelativeShift = 1e-5
-
-[Vtk]
-WriteFaceData = false
diff --git a/test/freeflow/staggerednc/test_densitydrivenflow.cc b/test/freeflow/staggerednc/test_densitydrivenflow.cc
new file mode 100644
index 0000000000..cdc785170e
--- /dev/null
+++ b/test/freeflow/staggerednc/test_densitydrivenflow.cc
@@ -0,0 +1,64 @@
+// -*- mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+// vi: set et ts=4 sw=4 sts=4:
+/*****************************************************************************
+ *   See the file COPYING for full copying permissions.                      *
+ *                                                                           *
+ *   This program is free software: you can redistribute it and/or modify    *
+ *   it under the terms of the GNU General Public License as published by    *
+ *   the Free Software Foundation, either version 2 of the License, or       *
+ *   (at your option) any later version.                                     *
+ *                                                                           *
+ *   This program is distributed in the hope that it will be useful,         *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of          *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the            *
+ *   GNU General Public License for more details.                            *
+ *                                                                           *
+ *   You should have received a copy of the GNU General Public License       *
+ *   along with this program.  If not, see <http://www.gnu.org/licenses/>.   *
+ *****************************************************************************/
+/*!
+ * \file
+ *
+ * \brief Test for the staggered grid multi-component (Navier-)Stokes model
+ */
+#include <config.h>
+#include "densityflowproblem.hh"
+#include <dumux/common/start.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)
+{
+    if (errorMsg.size() > 0) {
+        std::string errorMessageOut = "\nUsage: ";
+                    errorMessageOut += progName;
+                    errorMessageOut += " [options]\n";
+                    errorMessageOut += errorMsg;
+                    errorMessageOut += "\n\nThe list of mandatory arguments 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.LensLowerLeftX   x-coordinate of the lower left corner of the lens [m] \n"
+                                        "\t-SpatialParams.LensLowerLeftY   y-coordinate of the lower left corner of the lens [m] \n"
+                                        "\t-SpatialParams.LensUpperRightX  x-coordinate of the upper right corner of the lens [m] \n"
+                                        "\t-SpatialParams.LensUpperRightY  y-coordinate of the upper right corner of the lens [m] \n"
+                                        "\t-SpatialParams.Permeability     Permeability of the domain [m^2] \n"
+                                        "\t-SpatialParams.PermeabilityLens Permeability of the lens [m^2] \n";
+
+        std::cout << errorMessageOut
+                  << "\n";
+    }
+}
+
+int main(int argc, char** argv)
+{
+    typedef TTAG(DensityDrivenFlowProblem) ProblemTypeTag;
+    return Dumux::start<ProblemTypeTag>(argc, argv, usage);
+}
diff --git a/test/freeflow/staggerednc/test_densitydrivenflow.input b/test/freeflow/staggerednc/test_densitydrivenflow.input
new file mode 100644
index 0000000000..155f138f49
--- /dev/null
+++ b/test/freeflow/staggerednc/test_densitydrivenflow.input
@@ -0,0 +1,19 @@
+[TimeManager]
+DtInitial = 1e2 # [s]
+TEnd = 1e4 # [s]
+
+[Grid]
+UpperRight = 1 1
+Cells = 20 20
+
+[Problem]
+Name = test_densitydrivenflow # name passed to the output routines
+InletVelocity = 1
+EnableGravity = true
+
+[ Newton ]
+MaxSteps = 10
+MaxRelativeShift = 1e-5
+
+[Vtk]
+WriteFaceData = false
diff --git a/test/freeflow/staggerednc/test_purediffusion.input b/test/freeflow/staggerednc/test_purediffusion.input
new file mode 100644
index 0000000000..d93f573994
--- /dev/null
+++ b/test/freeflow/staggerednc/test_purediffusion.input
@@ -0,0 +1,19 @@
+[TimeManager]
+DtInitial = 1e6 # [s]
+TEnd = 1e9 # [s]
+
+[Grid]
+UpperRight = 5 1
+Cells = 50 10
+
+[Problem]
+Name = test_purediffusion # name passed to the output routines
+InletVelocity = 0
+EnableGravity = false
+
+[ Newton ]
+MaxSteps = 10
+MaxRelativeShift = 1e-8
+
+[Vtk]
+WriteFaceData = false
diff --git a/test/references/stokes2c-advection.vtu b/test/references/stokes2c-advection.vtu
new file mode 100644
index 0000000000..ec82188247
--- /dev/null
+++ b/test/references/stokes2c-advection.vtu
@@ -0,0 +1,892 @@
+<?xml version="1.0"?>
+<VTKFile type="UnstructuredGrid" version="0.1" byte_order="LittleEndian">
+  <UnstructuredGrid>
+    <Piece NumberOfCells="500" NumberOfPoints="561">
+      <CellData Scalars="pressure" Vectors="velocity_liquid (m/s)">
+        <DataArray type="Float32" Name="pressure" NumberOfComponents="1" format="ascii">
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+        </DataArray>
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diff --git a/test/references/stokes2c-densitydriven-reference.vtu b/test/references/stokes2c-densitydriven-reference.vtu
new file mode 100644
index 0000000000..b5b56f06f5
--- /dev/null
+++ b/test/references/stokes2c-densitydriven-reference.vtu
@@ -0,0 +1,724 @@
+<?xml version="1.0"?>
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diff --git a/test/references/stokes2c-purediffusion.vtu b/test/references/stokes2c-purediffusion.vtu
new file mode 100644
index 0000000000..d7acba2c5d
--- /dev/null
+++ b/test/references/stokes2c-purediffusion.vtu
@@ -0,0 +1,892 @@
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-- 
GitLab