Actions for Dynamical interpretation of conditional patterns

Email RIS file
Bookmark
Report an Issue

Dynamical interpretation of conditional patterns

Author
Adrian, R. J.
Published
Dec 1, 1988.
Physical Description
1 electronic document
Additional Creators
Moin, P. and Moser, R. D.
Online Version

Availability

I Want It
I Want It

Finding items...

Restrictions on Access
Unclassified, Unlimited, Publicly available.
Free-to-read Unrestricted online access
Summary
While great progress is being made in characterizing the 3-D structure of organized turbulent motions using conditional averaging analysis, there is a lack of theoretical guidance regarding the interpretation and utilization of such information. Questions concerning the significance of the structures, their contributions to various transport properties, and their dynamics cannot be answered without recourse to appropriate dynamical governing equations. One approach which addresses some of these questions uses the conditional fields as initial conditions and calculates their evolution from the Navier-Stokes equations, yielding valuable information about stability, growth, and longevity of the mean structure. To interpret statistical aspects of the structures, a different type of theory which deals with the structures in the context of their contributions to the statistics of the flow is needed. As a first step toward this end, an effort was made to integrate the structural information from the study of organized structures with a suitable statistical theory. This is done by stochastically estimating the two-point conditional averages that appear in the equation for the one-point probability density function, and relating the structures to the conditional stresses. Salient features of the estimates are identified, and the structure of the one-point estimates in channel flow is defined.
Other Subject(s)
Collection
NASA Technical Reports Server (NTRS) Collection.
Note
Document ID: 19890015178.
Accession ID: 89N24549.
Studying Turbulence Using Numerical Simulation Databases, 2. Proceedings of the 1988 Summer Program; p 123-129.
Terms of Use and Reproduction
No Copyright.
View MARC record | catkey: 15690289