HYSTERESIS OF TURBULENT STRESSES IN WALL FLOWS SUBJECTED TO PERIODIC DISTURBANCES.

Abstract

The paper discusses some specific features of turbulent flows subjected to the periodic variation of external conditions. A particular emphasis is placed on the lagging response of turbulent structure and the hysteresis of turbulent stresses that were detected experimentally in a number of periodic flows. Several sets of experimental data were analysed in this light and attempts were made to obtain their prediction by means of single- and double-scale models of turbulence. Attention was focused on a case of simulated tidal flow where the above mentioned features are particularly pronounced. Refs.