From 53bd62e50da02d7c77a3d5a78c103e05eb1f97aa Mon Sep 17 00:00:00 2001
From: Henry <Henry>
Date: Wed, 30 May 2012 15:25:17 +0100
Subject: [PATCH] LimitedSchemes: Improved handling of division by very small
number
---
.../limitedSchemes/LimitedScheme/NVDTVD.H | 26 ++++++++++++-------
.../limitedSchemes/LimitedScheme/NVDVTVDV.H | 26 ++++++++++++-------
2 files changed, 34 insertions(+), 18 deletions(-)
diff --git a/src/finiteVolume/interpolation/surfaceInterpolation/limitedSchemes/LimitedScheme/NVDTVD.H b/src/finiteVolume/interpolation/surfaceInterpolation/limitedSchemes/LimitedScheme/NVDTVD.H
index f4ef12ff64e..688c26cd777 100644
--- a/src/finiteVolume/interpolation/surfaceInterpolation/limitedSchemes/LimitedScheme/NVDTVD.H
+++ b/src/finiteVolume/interpolation/surfaceInterpolation/limitedSchemes/LimitedScheme/NVDTVD.H
@@ -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) 2011-2012 OpenFOAM Foundation
\\/ M anipulation |
-------------------------------------------------------------------------------
License
@@ -81,10 +81,14 @@ public:
gradcf = d & gradcN;
}
- // Stabilise for division
- gradcf = stabilise(gradcf, VSMALL);
-
- return 1 - 0.5*gradf/gradcf;
+ if (mag(gradf) >= 1000*mag(gradcf))
+ {
+ return 1 - 0.5*1000*sign(gradcf)*sign(gradf);
+ }
+ else
+ {
+ return 1 - 0.5*gradf/gradcf;
+ }
}
@@ -111,10 +115,14 @@ public:
gradcf = d & gradcN;
}
- // Stabilise for division
- gradf = stabilise(gradf, VSMALL);
-
- return 2*(gradcf/gradf) - 1;
+ if (mag(gradcf) >= 1000*mag(gradf))
+ {
+ return 2*1000*sign(gradcf)*sign(gradf) - 1;
+ }
+ else
+ {
+ return 2*(gradcf/gradf) - 1;
+ }
}
};
diff --git a/src/finiteVolume/interpolation/surfaceInterpolation/limitedSchemes/LimitedScheme/NVDVTVDV.H b/src/finiteVolume/interpolation/surfaceInterpolation/limitedSchemes/LimitedScheme/NVDVTVDV.H
index df6c110a659..ac15c38976f 100644
--- a/src/finiteVolume/interpolation/surfaceInterpolation/limitedSchemes/LimitedScheme/NVDVTVDV.H
+++ b/src/finiteVolume/interpolation/surfaceInterpolation/limitedSchemes/LimitedScheme/NVDVTVDV.H
@@ -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) 2011-2012 OpenFOAM Foundation
\\/ M anipulation |
-------------------------------------------------------------------------------
License
@@ -81,10 +81,14 @@ public:
gradcf = gradfV & (d & gradcN);
}
- // Stabilise for division
- gradcf = stabilise(gradcf, VSMALL);
-
- return 1 - 0.5*gradf/gradcf;
+ if (mag(gradf) >= 1000*mag(gradcf))
+ {
+ return 1 - 0.5*1000*sign(gradcf)*sign(gradf);
+ }
+ else
+ {
+ return 1 - 0.5*gradf/gradcf;
+ }
}
@@ -112,10 +116,14 @@ public:
gradcf = gradfV & (d & gradcN);
}
- // Stabilise for division
- gradf = stabilise(gradf, VSMALL);
-
- return 2*(gradcf/gradf) - 1;
+ if (mag(gradcf) >= 1000*mag(gradf))
+ {
+ return 2*1000*sign(gradcf)*sign(gradf) - 1;
+ }
+ else
+ {
+ return 2*(gradcf/gradf) - 1;
+ }
}
};
--
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