NDLI: Stochastic estimation of conditional eddies in turbulent channel flow

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Stochastic estimation of conditional eddies in turbulent channel flow

Content Provider	NASA Technical Reports Server (NTRS)
Author	Moin, P. Adrian, R. J. Moser, R. D.
Copyright Year	1987
Description	Several long-standing issues regarding linear estimation and coherent structures are addressed, and some questions that were addressed partially, but never with the benefit of full, three-dimensional information are answered. The objectives were to: determine how well linear estimates approximate the field obtained by true conditional averaging, using events such as those in quadrant analysis; determine the extent to which the three-dimensional linearly estimated fields correspond to coherent structures, and the degree and manner in which they differ; evaluate the type and nature of the structural information gained by employing several different types of events; and learn more about the 3-D structure of important coherent motions that occur in wall turbulence. The results indicate that linear stochastic estimation can be used effectively in the study of numerical data bases consisting of three-dimensional vector fields, both velocity and vorticity. Two-point stochastic estimation yields more structural information and more detail than single-point estimation. The structures observed occurred repeatedly within the flow, but much can not be said about their dominance or the probability of their occurrence without further systematic studies of their frequency.
File Size	564986
Page Count	13
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19880013703
Archival Resource Key	ark:/13960/t1ng9j76v
Language	English
Publisher Date	1987-12-01
Access Restriction	Open
Subject Keyword	Fluid Mechanics And Heat Transfer Reynolds Stress Numerical Data Bases Turbulent Flow Stochastic Processes Vortices Vorticity Kinematics Shear Stress Linear Equations Velocity Distribution Channel Flow Estimates Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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