A region exists in the turbulence decay region in the lee of various fractal and regular grids which lasts for a number of turnover times and where a new non-equilibrium law holds:

The nonequilibrium turbulence dissipation law implies the existence of axisymmetric turbulent wake regions where the mean ow velocity decit decays as the inverse of the distance from the wake-generating body and the wake width grows as the square root of that distance. This behavior is dierent from any documented boundary-free turbulent shear ow to date. Its existence is conrmed in wind tunnel experiments of wakes generated by plates with irregular edges placed normal to an incoming free stream. The downstream distance over which these new non-equilibrium wake laws are observed would be of the order of the kilometer for an irregular object such as a tree of about 10 meters size.