Accession Number : ADA134796


Title :   Understanding Transition to Turbulence in Shear Layers.


Descriptive Note : Final rept. 1 Oct 76-31 Dec 82,


Corporate Author : ILLINOIS INST OF TECH CHICAGO DEPT OF MECHANICS MECHANICAL AND AEROSPACE ENGINEERING


Personal Author(s) : Morkovin,M V


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a134796.pdf


Report Date : May 1983


Pagination or Media Count : 140


Abstract : Critical examination of experimental, analytical and numerical research on shear-flow instabilities evolving into turbulence led to a conceptual framework consistent with reliable observations. Mechanically driven shear layers fall into four classes: boundary layers, confined duct flows, free shear layers, and flows in annuli between cylinders driven by the rotation of the inner cylinder. These classes correspond to distinct, initially rather homogeneous vorticity distributions. Each instability restructures these distributions; it dehomogenizes them spatially, while the very slow viscous effects smooth the largest gradients. The restructuring continues even after the shear layers become turbulent.


Descriptors :   *Turbulent flow , *Shear properties , Layers , Reynolds number , Transitions , Unsteady flow , Bifurcation(Mathematics) , Boundary layer , Turbulent boundary layer , Vortices , Navier Stokes equations , Laminar boundary layer , Homogeneity


Subject Categories : Fluid Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE