From e2d54dfe14715c0d7a63c55af465725b4fbe5153 Mon Sep 17 00:00:00 2001
From: Kutalmis Bercin <kutalmis.bercin@esi-group.com>
Date: Tue, 21 Sep 2021 20:49:35 +0100
Subject: [PATCH] BUG: PilchErdman: correct the sign of the exponent (fixes
 #2214)

---
 .../spray/submodels/BreakupModel/PilchErdman/PilchErdman.C     | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/lagrangian/spray/submodels/BreakupModel/PilchErdman/PilchErdman.C b/src/lagrangian/spray/submodels/BreakupModel/PilchErdman/PilchErdman.C
index fad09c3fa4..a3febaf29d 100644
--- a/src/lagrangian/spray/submodels/BreakupModel/PilchErdman/PilchErdman.C
+++ b/src/lagrangian/spray/submodels/BreakupModel/PilchErdman/PilchErdman.C
@@ -6,6 +6,7 @@
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
     Copyright (C) 2011-2013 OpenFOAM Foundation
+    Copyright (C) 2021 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -116,7 +117,7 @@ bool Foam::PilchErdman<CloudType>::update
             else if (We > 45)
             {
                 // bag-and-stamen breakup  - eq (10)
-                taubBar = 14.1*pow(We - 12.0, 0.25);
+                taubBar = 14.1*pow(We - 12.0, -0.25);
             }
             else if (We > 18)
             {