NDLI: Aspects of turbulent / non-turbulent interfaces

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Aspects of turbulent / non-turbulent interfaces

Content Provider	NASA Technical Reports Server (NTRS)
Author	Hunt, J. C. R. Bisset, D. K. Rogers, M. M.
Copyright Year	1999
Description	A distinct boundary between turbulent and non-turbulent regions in a fluid of otherwise constant properties is found in many laboratory and engineering turbulent flows, including jets, mixing layers, boundary layers and wakes. Generally, the flow has mean shear in at least one direction within t he turbulent zone, but the non-turbulent zones have no shear (adjacent laminar shear is a different case, e.g. transition in a boundary layer). There may be purely passive differences between the turbulent and non-turbulent zones, e.g. small variations in temperature or scalar concentration, for which turbulent mixing is an important issue. The boundary has several major characteristics of interest for the present study. Firstly, the boundary advances into the non-turbulent fluid, or in other words, nonturbulent fluid is entrained. Secondly, the change in turbulence properties across the boundary is remarkably abrupt; strong turbulent motions come close to the nonturbulent fluid, promoting entrainment. Thirdly, the boundary is irregular with a continually changing convoluted shape, which produces statistical intermittency. Its shape is contorted at all scales of the turbulent motion.
File Size	692172
Page Count	10
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20000103536
Archival Resource Key	ark:/13960/t90916p9j
Language	English
Publisher Date	1999-11-22
Access Restriction	Open
Subject Keyword	Fluid Mechanics And Thermodynamics Turbulent Flow Entrainment Wakes Scalars Regions Shapes Boundary Layers Turbulent Mixing 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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