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.