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Time averaging a product of fluctuations <u'T'>

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Old   November 14, 2013, 16:35
Default Time averaging a product of fluctuations <u'T'>
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Laurien Vandewalle
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Hi everyone,

I would like to calculate turbulent heat fluxes, which are defined as the time averages of the velocity and temperature fluctuations:

<u' T'> where <..> denotes a time averaging operation, and u' and T' are respectively the velocity and temperature fluctuations.

Is there an easy solution to achieve this? I tried with the fieldAverage function in the controlDict but there it is only possible to calculate the prime-squared mean values of 1 field, e.g. <u'u'>. Someone has a solution?

Kind regards,
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Old   November 15, 2013, 03:18
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You can try to create a field U*T somehow, then <u'T'>=<UT>-<U><T>, where I assume you are tracking the mean quantities anyhow.
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Old   January 23, 2014, 05:48
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Hi, Laurien!

Have you found a solution yet? I want to calculate <u' T'> too. It would be very kind of you to share some information about this problem.

Best regards,
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Old   April 29, 2015, 06:16
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Agustín Villa
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were you able to find a solution for this? I am wondering I have to modify the fieldAverage function, but it's not so easy to understand the code...
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