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Added Yi Wang's RMS correction factor and parameter alpha.

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This commit is contained in:
henry
2008-05-06 11:59:46 +01:00
parent c1aa2b60d6
commit c7ca458e18
2 changed files with 25 additions and 4 deletions
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16
src/finiteVolume/fields/fvPatchFields/derived/turbulentInlet/turbulentInletFvPatchField.C
View File

@ -44,6 +44,7 @@ turbulentInletFvPatchField<Type>::turbulentInletFvPatchField
ranGen_(label(0)), ranGen_(label(0)),
fluctuationScale_(pTraits<Type>::zero), fluctuationScale_(pTraits<Type>::zero),
referenceField_(p.size()), referenceField_(p.size()),
alpha_(0.1),
curTimeIndex_(-1) curTimeIndex_(-1)
{} {}
@ -61,6 +62,7 @@ turbulentInletFvPatchField<Type>::turbulentInletFvPatchField
ranGen_(label(0)), ranGen_(label(0)),
fluctuationScale_(ptf.fluctuationScale_), fluctuationScale_(ptf.fluctuationScale_),
referenceField_(ptf.referenceField_, mapper), referenceField_(ptf.referenceField_, mapper),
alpha_(ptf.alpha_),
curTimeIndex_(-1) curTimeIndex_(-1)
{} {}
@ -77,6 +79,7 @@ turbulentInletFvPatchField<Type>::turbulentInletFvPatchField
ranGen_(label(0)), ranGen_(label(0)),
fluctuationScale_(pTraits<Type>(dict.lookup("fluctuationScale"))), fluctuationScale_(pTraits<Type>(dict.lookup("fluctuationScale"))),
referenceField_("referenceField", dict, p.size()), referenceField_("referenceField", dict, p.size()),
alpha_(dict.lookupOrDefault<scalar>("alpha", 0.1)),
curTimeIndex_(-1) curTimeIndex_(-1)
{ {
if (dict.found("value")) if (dict.found("value"))
@ -103,6 +106,7 @@ turbulentInletFvPatchField<Type>::turbulentInletFvPatchField
ranGen_(ptf.ranGen_), ranGen_(ptf.ranGen_),
fluctuationScale_(ptf.fluctuationScale_), fluctuationScale_(ptf.fluctuationScale_),
referenceField_(ptf.referenceField_), referenceField_(ptf.referenceField_),
alpha_(ptf.alpha_),
curTimeIndex_(-1) curTimeIndex_(-1)
{} {}
@ -118,6 +122,7 @@ turbulentInletFvPatchField<Type>::turbulentInletFvPatchField
ranGen_(ptf.ranGen_), ranGen_(ptf.ranGen_),
fluctuationScale_(ptf.fluctuationScale_), fluctuationScale_(ptf.fluctuationScale_),
referenceField_(ptf.referenceField_), referenceField_(ptf.referenceField_),
alpha_(ptf.alpha_),
curTimeIndex_(-1) curTimeIndex_(-1)
{} {}
@ -170,9 +175,14 @@ void turbulentInletFvPatchField<Type>::updateCoeffs()
ranGen_.randomise(randomField[facei]); ranGen_.randomise(randomField[facei]);
} }
patchField = // Correction-factor proposed by Yi Wang to compensate for the loss
0.9*patchField // of RMS fluctuation due to the temporal correlation introduced by
+ 0.1* // the alpha parameter.
scalar rmsCorr = sqrt(12*(2*alpha_ - sqr(alpha_)))/alpha_;
patchField =
(rmsCorr*(1 - alpha_))*patchField
+ (rmsCorr*alpha_)*
( (
referenceField_ referenceField_
+ cmptMultiply + cmptMultiply

13
src/finiteVolume/fields/fvPatchFields/derived/turbulentInlet/turbulentInletFvPatchField.H
View File

@ -26,7 +26,17 @@ Class
Foam::turbulentInletFvPatchField Foam::turbulentInletFvPatchField
Description Description
Foam::turbulentInletFvPatchField Generate a fluctuating inlet condition by adding a random component
to a reference (mean) field.
Input:
referenceField
Mean field.
fluctuationScale
RMS fluctuation, provided as the fraction of the mean field.
alpha
temporal correlation factor;
the fraction of the new random component added to the previous
time-step (defaults to 0.1).
SourceFiles SourceFiles
turbulentInletFvPatchField.C turbulentInletFvPatchField.C
@ -59,6 +69,7 @@ class turbulentInletFvPatchField
Random ranGen_; Random ranGen_;
Type fluctuationScale_; Type fluctuationScale_;
Field<Type> referenceField_; Field<Type> referenceField_;
scalar alpha_;
label curTimeIndex_; label curTimeIndex_;