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Identification Of Coherent Motions Using Wall Pressure Signatures
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Book Synopsis Identification of Coherent Motions Using Wall Pressure Signatures by :
Download or read book Identification of Coherent Motions Using Wall Pressure Signatures written by and published by . This book was released on 1996 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Large amplitude wall-pressure events observed beneath a turbulent boundary layer appear to be signatures of near-wall organized structures. Experimental investigations by the authors and their colleagues have provided strong support for this conjecture. This report contains results from new studies which attempt to identify the distinct structural features and spatial extent of the organized motions from observations of their wall pressure footprints. A database, which contains simultaneous measurements of wall-pressure, and stream-wise and wall-normal velocities at numerous locations across the boundary layer, was used in this investigation. These data are analyzed using signal processing techniques based on a trajectory mapping for the detection of coherent motions. The results show that the organized structures contain both ejection motions (accelerated events) that induce positive wall pressure events; and sweep motions (decelerated events) that induce negative wall pressure events. It is proposed that these structures collectively represent the organized motions. The present research activity is directed at the acquisition of a new database using an array of streamwise and spanwise transducers. By applying bandpass filtering techniques to the data, it is expected that the total pressure signature will become more evident.
Book Synopsis Wall Pressure Signatures of Organized Turbulent Motions by : Steven J. Russell
Download or read book Wall Pressure Signatures of Organized Turbulent Motions written by Steven J. Russell and published by . This book was released on 1997 with total page 195 pages. Available in PDF, EPUB and Kindle. Book excerpt: An extensive database of simultaneously obtained wall pressure and velocity measurements was acquired for a high Reynolds number, equilibrium turbulent flow. These data were obtained in both streamwise and spanwise measurement planes using an array of wall pressure transducers. Analyses of these data were performed to examine the spatial extent and convective features of turbulence producing structures. Several signal processing techniques were shown to extract detailed structural features of the turbulent motions. These techniques included digital band-pass filtering to discriminate between turbulent scales and a localized variance method for the detection of clusters of high frequency turbulent activity. Cross-spectral, cross-correlation, and conditional sampling methods applied to these data clearly show the dynamical relationships between coherent turbulent motions as well as their induced wall pressure signatures. Both pressure-velocity correlation results and conditionally averaged maps of the flow field sampled on peak wall pressure events, reveal a consistent correlation between large scale motions and near-wall, small scale turbulent production activity. The large scale vortical motions (or shear layers) extend across the turbulent boundary layer and exhibit Reynolds stress (turbulent production) characteristics. These findings are consistent with many of the proposed conceptual models of organized motions.
Book Synopsis Wall Pressure Signatures of Organized Turbulent Motions by : Steven J. Russell
Download or read book Wall Pressure Signatures of Organized Turbulent Motions written by Steven J. Russell and published by . This book was released on 1997-07-01 with total page 199 pages. Available in PDF, EPUB and Kindle. Book excerpt: An extensive database of simultaneously obtained wall pressure and velocity measurements was acquired for a high Reynolds number, equilibrium turbulent flow. These data were obtained in both streamwise and spanwise measurement planes using an array of wall pressure transducers. Analyses of these data were performed to examine the spatial extent and convective features of turbulence producing structures. Several signal processing techniques were shown to extract detailed structural features of the turbulent motions. These techniques included digital band pass filtering to discriminate between turbulent scales and a localized variance method for the detection of clusters of high frequency turbulent activity. Cross-spectral, cross-correlation, and conditional sampling methods applied to these data clearly show the dynamical relationships between coherent turbulent motions as well as their induced wall pressure signatures. Both pressure velocity correlation results and conditionally averaged maps of the flow field sampled on peak wall pressure events, reveal a consistent correlation between large scale motions and near- wall, small scale turbulent production activity. The large scale vortical motions (or shear layers) extend across the turbulent boundary layer and exhibit Reynolds stress (turbulent production) characteristics. These findings are consistent with many of the proposed conceptual models of organized motions.
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 994 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Coherent structures and secondary motions in open duct flow by : Sakai, Yoshiyuki
Download or read book Coherent structures and secondary motions in open duct flow written by Sakai, Yoshiyuki and published by KIT Scientific Publishing. This book was released on 2019-08-22 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1979 with total page 840 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Proceedings of the International Symposium on Seawater Drag Reduction by :
Download or read book Proceedings of the International Symposium on Seawater Drag Reduction written by and published by . This book was released on 1998 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Previews of Heat and Mass Transfer by :
Download or read book Previews of Heat and Mass Transfer written by and published by . This book was released on 1993 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Progress In Astronautics and Aeronautics by : Herman Branover
Download or read book Progress In Astronautics and Aeronautics written by Herman Branover and published by AIAA. This book was released on 1998 with total page 974 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Self-sustaining Mechanisms of Wall Turbulence by : Ronald Lee Panton
Download or read book Self-sustaining Mechanisms of Wall Turbulence written by Ronald Lee Panton and published by Computational Mechanics. This book was released on 1997 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: Why is wall turbulence self-sustaining? In this book well-regarded researchers not only discuss what they know and believe, but also speculate on ideas that still require numerical or experimental testing and verification. An initial brief history of boundary layer structure research is followed by chapters on experimental information and specific topics within the subject. There are then sections on computational aspects.
Book Synopsis 29th AIAA Fluid Dynamics Conference by :
Download or read book 29th AIAA Fluid Dynamics Conference written by and published by . This book was released on 1998 with total page 532 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Flow Noise Modeling, Measurement and Control, 1995 by : Richard M. Lueptow
Download or read book Flow Noise Modeling, Measurement and Control, 1995 written by Richard M. Lueptow and published by . This book was released on 1995 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Stochastic Estimation of the Flow Structure Downstream of a Separating/reattaching Flow Region Using Wall-pressure Array Measurements by : Mohamed Ibrahim Daoud
Download or read book Stochastic Estimation of the Flow Structure Downstream of a Separating/reattaching Flow Region Using Wall-pressure Array Measurements written by Mohamed Ibrahim Daoud and published by . This book was released on 2004 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Flow Noise Modeling, Measurement, and Control by :
Download or read book Flow Noise Modeling, Measurement, and Control written by and published by . This book was released on 1993 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :Herman Branover Publisher :AIAA (American Institute of Aeronautics & Astronautics) ISBN 13 : Total Pages :976 pages Book Rating :4.X/5 (4 download)
Book Synopsis Progress in Fluid Flow Research by : Herman Branover
Download or read book Progress in Fluid Flow Research written by Herman Branover and published by AIAA (American Institute of Aeronautics & Astronautics). This book was released on 1998 with total page 976 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contains papers from a February 1996 seminar on magnetohydrodynamic (MHD) flows and turbulence, covering contemporary trends in both experimental and theoretical research and presenting recent results in many areas. Subjects include transition, turbulence, MHD and atmospheric turbulence, astrophysics, experimental methods and data analysis, energy conversion, solidification, incompressible flow, and plasma MHD. Some topics are structure of the velocity field of a turbulent line-fire plume, helical instability of magnetohydrodynamic turbulence, energy sources of planetary magnetic fields, and characterization of microfabricated shear stress sensors. No index. Annotation copyrighted by Book News, Inc., Portland, OR
Book Synopsis Structure of Turbulence in Heat and Mass Transfer by : Zoran Zarić
Download or read book Structure of Turbulence in Heat and Mass Transfer written by Zoran Zarić and published by . This book was released on 1982 with total page 610 pages. Available in PDF, EPUB and Kindle. Book excerpt: Good,No Highlights,No Markup,all pages are intact, Slight Shelfwear,may have the corners slightly dented, may have slight color changes/slightly damaged spine.
Book Synopsis Noise Sources in Turbulent Shear Flows: Fundamentals and Applications by : Roberto Camussi
Download or read book Noise Sources in Turbulent Shear Flows: Fundamentals and Applications written by Roberto Camussi and published by Springer Science & Business Media. This book was released on 2013-02-11 with total page 453 pages. Available in PDF, EPUB and Kindle. Book excerpt: The articles in this volume present the state-of-the-art in noise prediction, modeling and measurement. The articles are partially based on class notes provided during the course `Noise sources in turbulent shear flows', given at CISM on April 2011. The first part contains general concepts of aero acoustics, including vortex sound theory and acoustic analogies, in the second part particular emphasis is put into arguments of interest for engineers and relevant for aircraft design: jet noise, airfoil broadband noise, boundary layer noise (including interior noise and its control) and the concept of noise sources, their theoretical modeling and identification in turbulent lows. All these arguments are treated extensively with the inclusion of many practical examples and references to engineering applications.
