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Forum: Main CFD Forum

March 17, 2022, 10:31

Replies: 13

Confusion in calculation of u', the velocity flucation

Views: 782

Posted By FMDenaro

Your LES database provided for sure the filtered...

Your LES database provided for sure the filtered velocity. From that you can deduce the k (unsteady) but also the approximation for the RANS (steady) velocity and the fluctuations.
My previous...

Forum: Main CFD Forum

March 17, 2022, 09:20

Replies: 13

Confusion in calculation of u', the velocity flucation

Views: 782

Posted By FMDenaro

But are you considering RANS, URANS or LES for k...

But are you considering RANS, URANS or LES for k ??

Forum: Main CFD Forum

March 17, 2022, 08:04

Replies: 13

Confusion in calculation of u', the velocity flucation

Views: 782

Posted By FMDenaro

No, the statistical average is exactly the time...

No, the statistical average is exactly the time averaging that produces a steady mean. Conversely, in LES the overbar is a filtering and all filtered variables are time dependent. Thus

...

Forum: Main CFD Forum

March 17, 2022, 07:16

Replies: 13

Confusion in calculation of u', the velocity flucation

Views: 782

Posted By FMDenaro

But in a real RANS computations you have no...

But in a real RANS computations you have no resolved fluctuations, you never compute the (u’u’)_bar term

Forum: Main CFD Forum

March 16, 2022, 14:15

Replies: 13

Confusion in calculation of u', the velocity flucation

Views: 782

Posted By FMDenaro

The time averaging must be theoretically extended...

The time averaging must be theoretically extended up to T->Infinite. Therefore, in practice you have to compute from 0 to T, but T must be enough large.

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