add optional flow_bo_diffusion simulator for testing

CMakeLists.txt

@@ -349,6 +349,16 @@ opm_add_test(flow_co2
   DEPENDS opmsimulators
   LIBRARIES opmsimulators)
 
+opm_add_test(flow_bo_diffusion
+  ONLY_COMPILE
+  DEFAULT_ENABLE_IF ${FLOW_VARIANTS_DEFAULT_ENABLE_IF}
+  SOURCES
+  flow/flow_bo_diffusion.cpp
+  $<TARGET_OBJECTS:moduleVersion>
+  EXE_NAME flow_bo_diffusion
+  DEPENDS opmsimulators
+  LIBRARIES opmsimulators)
+
 opm_add_test(flow_onephase_energy
   ONLY_COMPILE
   DEFAULT_ENABLE_IF ${FLOW_VARIANTS_DEFAULT_ENABLE_IF}

flow/flow_bo_diffusion.cpp

@@ -0,0 +1,44 @@
+/*
+  This file is part of the Open Porous Media project (OPM).
+
+  OPM 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 3 of the License, or
+  (at your option) any later version.
+
+  OPM 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 OPM.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#include "config.h"
+#include <opm/simulators/flow/Main.hpp>
+#include <opm/models/blackoil/blackoiltwophaseindices.hh>
+
+namespace Opm {
+namespace Properties {
+namespace TTag {
+struct EclFlowCo2Problem {
+    using InheritsFrom = std::tuple<EclFlowProblem>;
+};
+}
+
+template<class TypeTag>
+struct EnableDiffusion<TypeTag, TTag::EclFlowProblem> {
+    static constexpr bool value = true;
+};
+
+
+}}
+
+
+// ----------------- Main program -----------------
+int main(int argc, char** argv)
+{
+    using TypeTag = Opm::Properties::TTag::EclFlowCo2Problem;
+    auto mainObject = Opm::Main(argc, argv);
+    return mainObject.runStatic<TypeTag>();
+}