A uniform momentum zone-vortical fissure model of the turbulent boundary layer

Abstract

© 2018 Cambridge University Press. Recent studies reveal that at large friction Reynolds number the inertially dominated region of the turbulent boundary layer is composed of large-scale zones of nearly uniform momentum segregated by narrow fissures of concentrated vorticity. Experiments show that, when scaled by the boundary-layer thickness, the fissure thickness is while the dimensional jump in streamwise velocity across each fissure scales in proportion to the friction velocity. A simple model that exploits these essential elements of the turbulent boundary-layer structure at large is developed. First, a master wall-normal profile of streamwise velocity is constructed by placing a discret..