From 4781193e314c831708cdf42356e354bf26faec44 Mon Sep 17 00:00:00 2001
From: Andrew Heather <a.heather@opencfd.co.uk>
Date: Mon, 8 Jan 2018 10:33:56 +0000
Subject: [PATCH] ENH: nutUBlended wall function - added protection for uTau.
See #696
---
...utUBlendedWallFunctionFvPatchScalarField.C | 23 +++++++++++--------
1 file changed, 13 insertions(+), 10 deletions(-)
diff --git a/src/TurbulenceModels/turbulenceModels/derivedFvPatchFields/wallFunctions/nutWallFunctions/nutUBlendedWallFunction/nutUBlendedWallFunctionFvPatchScalarField.C b/src/TurbulenceModels/turbulenceModels/derivedFvPatchFields/wallFunctions/nutWallFunctions/nutUBlendedWallFunction/nutUBlendedWallFunctionFvPatchScalarField.C
index 81f1d10a259..47f25c6f0de 100644
--- a/src/TurbulenceModels/turbulenceModels/derivedFvPatchFields/wallFunctions/nutWallFunctions/nutUBlendedWallFunction/nutUBlendedWallFunctionFvPatchScalarField.C
+++ b/src/TurbulenceModels/turbulenceModels/derivedFvPatchFields/wallFunctions/nutWallFunctions/nutUBlendedWallFunction/nutUBlendedWallFunctionFvPatchScalarField.C
@@ -93,17 +93,20 @@ Foam::nutUBlendedWallFunctionFvPatchScalarField::calcUTau
forAll(uTaup, facei)
{
scalar ut = sqrt((nutw[facei] + nuw[facei])*magGradU[facei]);
- scalar error = GREAT;
- label iter = 0;
- while (iter++ < 10 && error > 0.001)
+ if (mag(ut) > ROOTVSMALL)
{
- scalar yPlus = y[facei]*ut/nuw[facei];
- scalar uTauVis = magUp[facei]/yPlus;
- scalar uTauLog = kappa_*magUp[facei]/log(E_*yPlus);
-
- scalar utNew = pow(pow(uTauVis, n_) + pow(uTauLog, n_), 1.0/n_);
- error = mag(ut - utNew)/(ut + ROOTVSMALL);
- ut = 0.5*(ut + utNew);
+ scalar error = GREAT;
+ label iter = 0;
+ while (iter++ < 10 && error > 0.001)
+ {
+ scalar yPlus = y[facei]*ut/nuw[facei];
+ scalar uTauVis = magUp[facei]/yPlus;
+ scalar uTauLog = kappa_*magUp[facei]/log(E_*yPlus);
+
+ scalar utNew = pow(pow(uTauVis, n_) + pow(uTauLog, n_), 1.0/n_);
+ error = mag(ut - utNew)/(ut + ROOTVSMALL);
+ ut = 0.5*(ut + utNew);
+ }
}
uTaup[facei] = ut;
}
--
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