Statistical Characteristics of Reynolds Stress in a Turbulent Boundary Layer

Abstract

The first four moments of the Reynolds stress fluctuations $\mathrm{u\upsilon (t)}$ , and of velocity components $\mathrm{u(t)}$ and $\mathrm{\upsilon (t)}$ were computed using digital data processing techniques. The results show that over a moderate range of Reynolds number ${\text{1900<Re}}_{\theta }\text{<6500}$ (based on momentum thickness) Reynolds stress fluctuations are intermittent and strongly skewed, while the $u$ and $\upsilon$ fluctuation components separately are not.