From Disorder to Order August 2000
Recently the “turbulent sublayer” was explored using a shear flow idealization akin to L. N. Howard's study of turbulent thermal convection [ 2]. There, the growing diffusive layers were studied to determine when they became unstable. Here, that work is extended to the first transitions of Couette and Poiseuille parallel flow. The merging boundary layers of the presumed flows pose a linear nonautonomous problem of following the time dependent first Lyapunov vector. As in Blasius flow, the first results emerge from perturbation theory, with corrections for streamwise evolution of the velocity profiles. The estimated critical Reynolds numbers for [back] transition from disorder to the laminar state are within 15% of the observations.
No Supplementary Data
No Article Media
Document Type: Original Article
Affiliations: Massachusetts Institute of Technology
Publication date: January 1, 2002