Hi, I am currently studying turbulence theory,

and eddy viscosity keeps bothering me.

Is there any way to estimate scale of eddy viscosity?

For example, textbook proposes \nu_T ~ ul,

in which u is a characteristic turbulence velocity

and l is a characteristic turbulence length.

But, how can I know size of turbulence velocity or turbulence length?

Please, help me.

Thank you.

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