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Computing Streamwise Turbulent HeatFlux

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Old   May 28, 2011, 10:06
Default Computing Streamwise Turbulent HeatFlux
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Hey there Foamers, I would like to confirm my understanding of calculating the streamwise turbulent heatflux, uT:

If I know Urms and Trms, can I take the product

uT= UrmsTrms ??

Thanks.
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Old   May 30, 2011, 05:49
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Hallo,

you can't do this:
you have to define the vectorfield
u*T, and get the mean-values out of this product and so get from this your rms values.
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Old   May 30, 2011, 10:22
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Thanks for the reply. I have checked, but it seems OpenFOAM fieldAverage does not have the capability of averaging u'T',v'T'. Is that so? Thanks much in advance.

Deji
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Old   June 1, 2011, 05:29
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Hi,

I would rewrite the solver and get an output similar to:

volVectorField UT
(
IOobject
(
"UT",
runTime.timeName(),
mesh,
IOobject::MUST_READ,
IOobject::AUTO_WRITE
),
U*T
);


and than in the controlDict:

functions
{
fieldAverage
{
type fieldAverage;
functionObjectLibs ("libfieldFunctionObjects.so");
enabled true;
outputControl outputTime;
fields
(
UT
{
mean on;
prime2Mean on;
base time;
}
);
}
}

Regards Thomas
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Old   June 1, 2011, 11:32
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Thank you very much Thomas.

Best regards,
Deji
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