Similarity of length scales in high-Reynolds-number wall-bounded flows

The wall dependence of length scales used to describe large- and small-scale structures turbulence is examined using highly resolved experiments in zero-pressure-gradient turbulent boundary layers pipe flows spanning the range $2000< Re_\tau <37\ 700$ . Of particular interest influence external intermittency on scaling these scales. It found that when suitable parameters are selected accounted for, dissipative motions follow inner even into outer-scaled regions flow, certain large-scale descriptions outer inner-scaled flow. same for both internal layer flows, different can be related recognizable features longitudinal wavenumber spectrum.