McComb, W.D.; Johnston, C. - In: Physica A: Statistical Mechanics and its Applications 292 (2001) 1, pp. 346-382
We show that a conditional average (based on a limit in which the Fourier modes of the turbulent velocity field with wavenumber k⩽kC, where kC is an arbitrary cutoff wavenumber, are held constant) can be used to separate the nonlinear coupling to high-k modes into coherent and random parts,...