An approximate method for solving turbulent velocity correlation functions in channel flows

Fluctuating velocity and its correlation functions are key quantities of turbulence. Soas early as the 1930s, Zhou Peiyuan pointed out that the rigorous way of solving tur-bulent problem is to solve the mean motion and fluctuation simultaneously, and set up thedynamical equations of the double and triple fluctuating velocity correlation. Due to thenonlinearity of the Navier-Stokes equation. the above dynamical equations are not closed.