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LimitedSchemes: Improved handling of division by very small number

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This commit is contained in:
Henry
2012-05-30 15:25:17 +01:00
parent 3e03e3ba07
commit 53bd62e50d
2 changed files with 34 additions and 18 deletions
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26
src/finiteVolume/interpolation/surfaceInterpolation/limitedSchemes/LimitedScheme/NVDTVD.H
View File

@ -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;
}
}
};

26
src/finiteVolume/interpolation/surfaceInterpolation/limitedSchemes/LimitedScheme/NVDVTVDV.H
View File

@ -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;
}
}
};