ABSTRACT
Chapter Overview and Goals Turbulent flows have velocity components and pressures that exhibit random and chaotic behavior. These flows are generally described in terms of their statistics rather than the instantaneous flow itself. To accomplish this, the velocities and pressures are split into mean and fluctuating components. The statistical quantities that are of primary interest are the root-mean-square values and correlations of the velocity components. Particular correlations of importance are the Reynolds stresses, which represent the momentum exchange introduced by the turbulent fluctuations, and are the turbulent counterpart of the molecular stresses.
