Print Email Facebook Twitter Boundary-layer turbulence as a kangaroo process Title Boundary-layer turbulence as a kangaroo process Author Dekker, H. de Leeuw, G. Maassen van den Brink, A. TNO Fysisch en Elektronisch Laboratorium Publication year 1995 Abstract A nonlocal mixing-length theory of turbulence transport by finite size eddies is developed by means of a novel evaluation of the Reynolds stress. The analysis involves the contruct of a sample path space and a stochastic closure hypothesis. The simplifying property of exhange (strong eddies) is satisfied by an analytical sampling rate model. A nonlinear scaling relation maps the path space onto the semi-infinite boundary layer. The underlying near-wall behavior of fluctuating velocities perfectly agrees with recent direct numerical simulations. The resulting integro-differential equation for the mixing of scalar densities represents fully developed boundary-layer turbulence as a nondiffusive (Kubo-Anderson or kangaroo) type of stochastic process. The model involves a scaling exponent (with → in the diffusion limit). For the (partly analytical) solution for the mean velocity profile, excellent agreement with the experimental data yields 0.58. © 1995 The American Physical Society. Subject Physics To reference this document use: http://resolver.tudelft.nl/uuid:b88a9c6f-06fd-4f5c-b71e-15a60d516be8 DOI https://doi.org/10.1103/physreve.52.2549 TNO identifier 280553 Source Physical Review E, 52 (3), 2549-2558 Document type article Files To receive the publication files, please send an e-mail request to TNO Library.