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Fluid flow is often decomposed into mean and deviation from the mean, where the averaging can be done in either space or time,

thus the mean flow is the field of means for all individual grid points.

with age comes wisdom...or copy paste from wiki

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prodigy69 broke b3ta and made everyone leave, Tue 16 Jun 2009, 11:24, archived)

*calls for backup*

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Barbarossa is not my real name, Tue 16 Jun 2009, 11:25, archived)

ah I should mention that this is through a channel geometry at this stage.

and it is supposed to be the solution of a helmholtz like equation for the zeroth fourier mode.

and I really should fix that wiki article...

(k3b/-\b Peace man., Tue 16 Jun 2009, 11:27, archived)