Recent studies have shown that the turbulence production process in shear flows is not entirely random, but rather quasiperiodic in nature. Since the large eddies play a decisive role in these processes in all shear flows, it is instructive to see if they bear any common characteristics. The possible universal distributions of time and velocity scales (T,u//p) in the low-frequency component of the turbulent signals - defined, respectively, as the interval between successive zero crossings and the intervening absolute peak value of the longitudinal velocity signal - have been explored in a number of flows. These include the self-preserving regions of a turbulent boundary layer, plane jet, circular jet, and plane mixing layer and the initial mixing regions of a plane jet and circular jet.
ASJC Scopus subject areas
- Aerospace Engineering