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Resonant Triad In Boundary Layer Stability Part 2 Composite Solution And Comparison With Observations

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Resonant Triad In Boundary Layer Stability Part 2 Composite Solution And Comparison With Observations

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Author :
language : en
Publisher:
Release Date : 1991

Resonant Triad In Boundary Layer Stability Part 2 Composite Solution And Comparison With Observations written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with categories.

Scientific And Technical Aerospace Reports

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Author :
language : en
Publisher:
Release Date : 1994

Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Aeronautics categories.

Resonant Triad In Boundary Layer Stability Part 2 Composite Solution And Comparison With Observations

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Author : National Aeronautics and Space Adm Nasa
language : en
Publisher:
Release Date : 2018-11-02

Resonant Triad In Boundary Layer Stability Part 2 Composite Solution And Comparison With Observations written by National Aeronautics and Space Adm Nasa and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-11-02 with categories.

Here, numerical results are computed from an asymptotic near-resonance triad analysis. The analysis considers a resonant triad of instability waves consisting of a plane fundamental wave and a pair of symmetrical oblique subharmonic waves. The relevant scaling ensures that nonlinearity is confined to a distinct critical layer. The analysis is first used to form a composite solution that accounts for both the flow divergence and nonlinear effects. It is shown that the backreaction on the plane Tollmien Schlichting (TS) fundamental wave, although fully accounted for, is of little significance. The observed enhancement at the fundamental frequency disturbance is not in the plane TS wave, but is caused by nonlinearly generated waves at the fundamental frequency that result from nonlinear interactions in the critical layer. The saturation of the oblique waves is caused by their self-interaction. The nonlinear phase-locking phenomenon, the location of resonance with respect to the neutral stability curve, low frequency effects, detuning in the streamwise wave numbers, and nonlinear distortion of the mode shapes are discussed. Nonlinearity modifies the initially two dimensional Blasius profile into a fuller one with spanwise periodicity. The interactions at a wide range of unstable spanwise wave numbers are considered, and the existence of a preferred spanwise wave number is explained by means of the vorticity distribution in the critical layer. Besides presenting novel features of the phenomena and explaining the delicate mechanisms of the interactions, the results of the theory are in excellent agreement with experimental and numerical observations for all stages of the development and for various input parameters. Mankbadi, Reda R. Glenn Research Center...

Resonant Triad In Boundary Layer Stability Part 1 Fully Nonlinear Interaction

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Author :
language : en
Publisher:
Release Date : 1991

Resonant Triad In Boundary Layer Stability Part 1 Fully Nonlinear Interaction written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with categories.

Monthly Catalog Of United States Government Publications

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Author :
language : en
Publisher:
Release Date : 1993-04

Monthly Catalog Of United States Government Publications written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993-04 with Government publications categories.

Monthly Catalogue United States Public Documents

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Author :
language : en
Publisher:
Release Date : 1993-03

Monthly Catalogue United States Public Documents written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993-03 with Government publications categories.

Instability Transition And Turbulence

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Author : M.Y. Hussaini
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06

Instability Transition And Turbulence written by M.Y. Hussaini and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.

This volume contains the proceedings of the Workshop on In stability, Transition and Turbulence, sponsored by the Institute for Computer Applications in Science and Engineering (ICASE) and the NASA Langley Research Center (LaRC), during July 8 to August 2, 1991. This is the second workshop in the series on the subject. The first was held in 1989, and its proceedings were published by Springer-Verlag under the title "Instability and Transition" edited by M. Y. Hussaini and R. G. Voigt. The objectives of these work shops are to i) expose the academic community to current technologically im portant issues of transition and turbulence in shear flows over the entire speed range, ii) acquaint the academic community with the unique combination of theoretical, computational and experimental capabilities at LaRC and foster interaction with these capabilities, and iii) accelerate progress in elucidating the fundamental phenomena of transition and turbulence, leading to improved transition and turbulence modeling in design methodologies. The research areas covered in these proceedings include receptiv ity and roughness, nonlinear theories of transition, numerical simu lation of spatially evolving flows, modelling of transitional and fully turbulent flows as well as some experiments on instability and tran sition. In addition a one-day mini-symposium was held to discuss 1 recent and planned experiments on turbulent flow over a backward facing step.