From cbb8c3678bd3660b368c3f9dcba0d204815f3d08 Mon Sep 17 00:00:00 2001
From: andy <andy>
Date: Wed, 6 Mar 2013 15:33:21 +0000
Subject: [PATCH] BUG: traction displacement error - mantis #763

---
 .../tractionDisplacementFvPatchVectorField.C                  | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/applications/solvers/stressAnalysis/solidDisplacementFoam/tractionDisplacement/tractionDisplacementFvPatchVectorField.C b/applications/solvers/stressAnalysis/solidDisplacementFoam/tractionDisplacement/tractionDisplacementFvPatchVectorField.C
index a0056d3c9a..57f4e68589 100644
--- a/applications/solvers/stressAnalysis/solidDisplacementFoam/tractionDisplacement/tractionDisplacementFvPatchVectorField.C
+++ b/applications/solvers/stressAnalysis/solidDisplacementFoam/tractionDisplacement/tractionDisplacementFvPatchVectorField.C
@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           | Copyright (C) 2011 OpenFOAM Foundation
+    \\  /    A nd           | Copyright (C) 2011-2013 OpenFOAM Foundation
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -181,7 +181,7 @@ void tractionDisplacementFvPatchVectorField::updateCoeffs()
 
     gradient() =
     (
-        (traction_ + pressure_*n)/rho
+        (traction_ - pressure_*n)/rho
       + twoMuLambda*fvPatchField<vector>::snGrad() - (n & sigmaD)
     )/twoMuLambda;