NDLI: Application of a reynolds stress model to separating boundary layers

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Application of a reynolds stress model to separating boundary layers

Content Provider	NASA Technical Reports Server (NTRS)
Author	Ko, Sung HO
Copyright Year	1993
Description	Separating turbulent boundary layers occur in many practical engineering applications. Nonetheless, the physics of separation/reattachment of flows is poorly understood. During the past decade, various turbulence models were proposed and their ability to successfully predict some types of flows was shown. However. prediction of separating/reattaching flows is still a formidable task for model developers. The present study is concerned with the process of separation from a smooth surface. Features of turbulent separating boundary layers that are relevant to modeling include the following: the occurrence of zero wall shear stress, which causes breakdown of the boundary layer approximation; the law of the wall not being satisfied in the mean back flow region; high turbulence levels in the separated region; a significant low-frequency motion in the separation bubble; and the turbulence structure of the separated shear layer being quite different from that of either the mixing layers or the boundary layers. These special characteristics of separating boundary layers make it difficult for simple turbulence models to correctly predict their behavior.
File Size	533942
Page Count	14
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19940007827
Archival Resource Key	ark:/13960/t8bg7m30c
Language	English
Publisher Date	1993-01-01
Access Restriction	Open
Subject Keyword	Fluid Mechanics And Heat Transfer Reynolds Stress Shear Layers Stress Analysis Turbulence Bubbles Turbulence Models Wall Flow Turbulent Boundary Layer Shear Stress Low Frequencies Walls Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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