From ed5341f7f2bfd4c548eca3f5cc217329e2620c2d Mon Sep 17 00:00:00 2001
From: Will Bainbridge <http://cfd.direct>
Date: Thu, 15 Apr 2021 11:57:25 +0100
Subject: [PATCH] multiphaseEulerFoam:
 InterfaceCompositionPhaseChangePhaseSystem: Fixed sign

Resolves bug report https://bugs.openfoam.org/view.php?id=3664
---
 .../InterfaceCompositionPhaseChangePhaseSystem.C                | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/applications/solvers/multiphase/multiphaseEulerFoam/phaseSystems/PhaseSystems/InterfaceCompositionPhaseChangePhaseSystem/InterfaceCompositionPhaseChangePhaseSystem.C b/applications/solvers/multiphase/multiphaseEulerFoam/phaseSystems/PhaseSystems/InterfaceCompositionPhaseChangePhaseSystem/InterfaceCompositionPhaseChangePhaseSystem.C
index 71cb1a6943..7efafe28d9 100644
--- a/applications/solvers/multiphase/multiphaseEulerFoam/phaseSystems/PhaseSystems/InterfaceCompositionPhaseChangePhaseSystem/InterfaceCompositionPhaseChangePhaseSystem.C
+++ b/applications/solvers/multiphase/multiphaseEulerFoam/phaseSystems/PhaseSystems/InterfaceCompositionPhaseChangePhaseSystem/InterfaceCompositionPhaseChangePhaseSystem.C
@@ -403,7 +403,7 @@ Foam::InterfaceCompositionPhaseChangePhaseSystem<BasePhaseSystem>::dmdtf
                     Pair<word>::compare(pair, key)
                    *(
                         *(*dmidtfSus_[pair])[specie]
-                      - *(*dmidtfSps_[pair])[specie]*phase.Y(specie)
+                      + *(*dmidtfSps_[pair])[specie]*phase.Y(specie)
                     );
             }
         }