From 0de1df730977553da4cb78d2e391030bf521f23e Mon Sep 17 00:00:00 2001
From: Kutalmis Bercin <kutalmis.bercin@esi-group.com>
Date: Tue, 13 Dec 2022 10:19:15 +0000
Subject: [PATCH] BUG: processorFaPatch: fix the sign of compound assignment

---
 .../constraint/processor/processorFaPatchScalarField.C          | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/finiteArea/fields/faPatchFields/constraint/processor/processorFaPatchScalarField.C b/src/finiteArea/fields/faPatchFields/constraint/processor/processorFaPatchScalarField.C
index b06e2d7736..65a9edb7f4 100644
--- a/src/finiteArea/fields/faPatchFields/constraint/processor/processorFaPatchScalarField.C
+++ b/src/finiteArea/fields/faPatchFields/constraint/processor/processorFaPatchScalarField.C
@@ -84,7 +84,7 @@ void Foam::processorFaPatchField<Foam::scalar>::updateInterfaceMatrix
     {
         forAll(edgeFaces, facei)
         {
-            result[edgeFaces[facei]] -= coeffs[facei]*pnf[facei];
+            result[edgeFaces[facei]] += coeffs[facei]*pnf[facei];
         }
     }
     else