Also copy flags, and helper function with test.

opm/simulators/flow/BlackoilModelEbosNldd.hpp

@@ -31,6 +31,7 @@
 #include <opm/simulators/aquifers/AquiferGridUtils.hpp>
 
 #include <opm/simulators/flow/partitionCells.hpp>
+#include <opm/simulators/flow/priVarsPacking.hpp>
 #include <opm/simulators/flow/SubDomain.hpp>
 
 #include <opm/simulators/linalg/extractMatrix.hpp>
@@ -266,7 +267,22 @@ public:
         const auto& comm = model_.ebosSimulator().vanguard().grid().comm();
         if (comm.size() > 1) {
             const auto& ccomm = model_.ebosSimulator().model().newtonMethod().linearSolver().comm();
+
+            // Copy numerical values from primary vars.
             ccomm->copyOwnerToAll(solution, solution);
+
+            // Copy flags from primary vars.
+            const std::size_t num = solution.size();
+            Dune::BlockVector<std::size_t> allmeanings(num);
+            for (std::size_t ii = 0; ii < num; ++ii) {
+                allmeanings[ii] = PVUtil::pack(solution[ii]);
+            }
+            ccomm->copyOwnerToAll(allmeanings, allmeanings);
+            for (std::size_t ii = 0; ii < num; ++ii) {
+                PVUtil::unPack(solution[ii], allmeanings[ii]);
+            }
+
+            // Update intensive quantities for our overlap values.
             model_.ebosSimulator().model().invalidateAndUpdateIntensiveQuantitiesOverlap(/*timeIdx=*/0);
         }
 

opm/simulators/flow/priVarsPacking.hpp

@@ -0,0 +1,54 @@
+/*
+  Copyright 2023 Total SE
+
+  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/>.
+*/
+
+#ifndef OPM_PRIVARSPACKING_HEADER_INCLUDED
+#define OPM_PRIVARSPACKING_HEADER_INCLUDED
+
+#include <cstddef>
+
+namespace Opm {
+
+    namespace PVUtil {
+        constexpr int fbits = 4;
+
+        template <class PV>
+        std::size_t pack(const PV& privar) {
+            std::size_t m1 = static_cast<std::size_t>(privar.primaryVarsMeaningWater());
+            std::size_t m2 = static_cast<std::size_t>(privar.primaryVarsMeaningPressure());
+            std::size_t m3 = static_cast<std::size_t>(privar.primaryVarsMeaningGas());
+            std::size_t m4 = static_cast<std::size_t>(privar.primaryVarsMeaningBrine());
+            return m1 + (m2 << fbits*1) + (m3 << fbits*2) + (m4 << fbits*3);
+        }
+
+        template <class PV>
+        void unPack(PV& privar, const std::size_t meanings) {
+            const std::size_t filter = ((1 << fbits) - 1);
+            std::size_t m1 = (meanings >> fbits*0) & filter;
+            std::size_t m2 = (meanings >> fbits*1) & filter;
+            std::size_t m3 = (meanings >> fbits*2) & filter;
+            std::size_t m4 = (meanings >> fbits*3) & filter;
+            privar.setPrimaryVarsMeaningWater(typename PV::WaterMeaning(m1));
+            privar.setPrimaryVarsMeaningPressure(typename PV::PressureMeaning(m2));
+            privar.setPrimaryVarsMeaningGas(typename PV::GasMeaning(m3));
+            privar.setPrimaryVarsMeaningBrine(typename PV::BrineMeaning(m4));
+        }
+    } // namespace PVMeanings
+} // namespace Opm
+
+#endif // OPM_PRIVARSPACKING_HEADER_INCLUDED