A flat plate traveling through liquid has a boundary layer going to
0 velocity of size . Then , which is sort of a reynolds number.
The reynolds number of the boundary layer is which determines whether
the wake will be turbulent. if the reynolds number is less than a
few hundred the flow is not turbulent.
. Then 
, which is sort of a reynolds number.
The reynolds number of the boundary layer is 
which determines whether
the wake will be turbulent. if the reynolds number is less than a
few hundred the flow is not turbulent.