Further Modeling Of Turbulent Wall Pressure On A Cylinder And Its Scaling With Diameter

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Further Modeling of Turbulent Wall Pressure on a Cylinder and Its Scaling with Diameter

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Author : David M. Chase
Publisher :
ISBN 13 :
Total Pages : 48 pages
Book Rating : 4.:/5 (227 download)

Book Synopsis Further Modeling of Turbulent Wall Pressure on a Cylinder and Its Scaling with Diameter by : David M. Chase

Download or read book Further Modeling of Turbulent Wall Pressure on a Cylinder and Its Scaling with Diameter written by David M. Chase and published by . This book was released on 1981 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: The possible scaling of the axisymmetric component of spectral density of wall pressure in turbulent flow along a slender cylinder is reexamined with use of a formal low-wavenumber expansion in terms of fluctuating Reynolds stresses as sources. A rudimentary model of the sources is formed that conforms to the principle of local similarity near the wall and to probable implications of fluctuating and mean velocity profiles measured in cylindrical boundary layers. To the extent that wall pressure is exclusively due to such a turbulence field, to zero order in wavenumber, at least, it is indicated to scale with cylinder radius (a) and to agree in functional dependence with the current model for this low-wavenumber component. If the turbulence field (despite lack of experimental evidence) involves in addition a weak component that scales with boundary-layer thickness, then at sufficiently low frequencies and wavenumbers the corresponding contribution to wall pressure (when delta/a”1) may become dominant, and the extrapolation of the current model to very small omega a/U(Infinity) and the associated prediction of diameter dependence may then fail.

Further Modeling of Turbulent Wall Pressure on a Cylinder for Arbitrary Boundary-Layer Thickness

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Author : C. F. Noiseux
Publisher :
ISBN 13 :
Total Pages : 19 pages
Book Rating : 4.:/5 (227 download)

Book Synopsis Further Modeling of Turbulent Wall Pressure on a Cylinder for Arbitrary Boundary-Layer Thickness by : C. F. Noiseux

Download or read book Further Modeling of Turbulent Wall Pressure on a Cylinder for Arbitrary Boundary-Layer Thickness written by C. F. Noiseux and published by . This book was released on 1982 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Scientific and Technical Aerospace Reports

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Author :
Publisher :
ISBN 13 :
Total Pages : 486 pages
Book Rating : 4.:/5 (319 download)

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 1991 with total page 486 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Wall-pressure Fluctuations and Pressure-velocity Correlations in a Turbulent Boundary Layer

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Author : John S. Serafini
Publisher :
ISBN 13 :
Total Pages : 88 pages
Book Rating : 4.:/5 (317 download)

Book Synopsis Wall-pressure Fluctuations and Pressure-velocity Correlations in a Turbulent Boundary Layer by : John S. Serafini

Download or read book Wall-pressure Fluctuations and Pressure-velocity Correlations in a Turbulent Boundary Layer written by John S. Serafini and published by . This book was released on 1963 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: This experimental study was carried out at a free-stream Mach number of 0.6 and a Reynolds number per foot of 3.45 x 106. The magnitudes of the wall-pressure fluctuations agree with the Lilley-Hodgson theoretical results. Space-time correlations of the wall-pressure fluctuations generally agree with Willmarth's results for longitudinal separation distances. The convection velocity of the fluctuations is found to increase with increasing separation distances, and its significance is explained. Measurements with the longitudinal component of the velocity fluctuations indicate that the contributions to the wall-pressure fluctuations are from two regions, an inner region near the wall and an outer region linked with the intermittency.

A Quasi-dimensional Charge Motion and Turbulence Model for Combustion and Emissions Prediction in Diesel Engines with a fully Variable Valve Train

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Author : Qirui Yang
Publisher : Springer Nature
ISBN 13 : 3658357746
Total Pages : 141 pages
Book Rating : 4.6/5 (583 download)

Book Synopsis A Quasi-dimensional Charge Motion and Turbulence Model for Combustion and Emissions Prediction in Diesel Engines with a fully Variable Valve Train by : Qirui Yang

Download or read book A Quasi-dimensional Charge Motion and Turbulence Model for Combustion and Emissions Prediction in Diesel Engines with a fully Variable Valve Train written by Qirui Yang and published by Springer Nature. This book was released on 2021-10-01 with total page 141 pages. Available in PDF, EPUB and Kindle. Book excerpt: Qirui Yang develops a model chain for the simulation of combustion and emissions of diesel engine with fully variable valve train (VVT) based on extensive 3D-CFD simulations, and experimental measurements on the engine test bench. The focus of the work is the development of a quasi-dimensional (QDM) flow model, which sets up a series of sub-models to describe phenomenologically the swirl, squish and axial charge motions as well as the shear-related turbulence production and dissipation. The QDM flow model is coupled with a QDM combustion model and a nitrogen oxides (NOx) / soot emission model. With the established model chain, VVT operating strategies of diesel engine can be developed and optimized as part of the simulation for specific engine performance parameters and the lowest NOx and soot emissions.

WALL PRESSURE FLUCTUATIONS BENEATH AN AXIALLY SUMMERTRIC TURBULEN BOUNDARY LAYER ON A CYLINDER

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Author : CHI-SHENG YANG, WILLIAM W. WILLMARTH
Publisher :
ISBN 13 :
Total Pages : 114 pages
Book Rating : 4.L/5 ( download)

Book Synopsis WALL PRESSURE FLUCTUATIONS BENEATH AN AXIALLY SUMMERTRIC TURBULEN BOUNDARY LAYER ON A CYLINDER by : CHI-SHENG YANG, WILLIAM W. WILLMARTH

Download or read book WALL PRESSURE FLUCTUATIONS BENEATH AN AXIALLY SUMMERTRIC TURBULEN BOUNDARY LAYER ON A CYLINDER written by CHI-SHENG YANG, WILLIAM W. WILLMARTH and published by . This book was released on 1969 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Wall Pressure Fluctuations Beneath an Axially Symmetric Turbulent Boundary Layer on a Cylinder

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Author : Chi-Sheng Yang
Publisher :
ISBN 13 :
Total Pages : 101 pages
Book Rating : 4.:/5 (227 download)

Book Synopsis Wall Pressure Fluctuations Beneath an Axially Symmetric Turbulent Boundary Layer on a Cylinder by : Chi-Sheng Yang

Download or read book Wall Pressure Fluctuations Beneath an Axially Symmetric Turbulent Boundary Layer on a Cylinder written by Chi-Sheng Yang and published by . This book was released on 1969 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt: Measurements of the turbulent pressure field on the outer surface of a 3 inch diameter cylinder were made at a point 24 feet downstream of the origin of the turbulent boundary layer. The root-mean square wall pressure was 2.42 times the wall shear stress. The normalized power spectrum at high frequencies contained twice the energy density of the spectrum beneath a plane boundary layer. The convection speed was the same as that in a plane boundary layer but the eddy size was smaller by a factor of two. The smaller eddy size and unchanged convection speed account for the greater energy in the spectrum at high frequencies. (Author).

Engineering Turbulence Modelling and Experiments 5

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Author : W. Rodi
Publisher : Elsevier
ISBN 13 : 008053094X
Total Pages : 1029 pages
Book Rating : 4.0/5 (85 download)

Book Synopsis Engineering Turbulence Modelling and Experiments 5 by : W. Rodi

Download or read book Engineering Turbulence Modelling and Experiments 5 written by W. Rodi and published by Elsevier. This book was released on 2002-08-21 with total page 1029 pages. Available in PDF, EPUB and Kindle. Book excerpt: Turbulence is one of the key issues in tackling engineering flow problems. As powerful computers and accurate numerical methods are now available for solving the flow equations, and since engineering applications nearly always involve turbulence effects, the reliability of CFD analysis depends increasingly on the performance of the turbulence models. This series of symposia provides a forum for presenting and discussing new developments in the area of turbulence modelling and measurements, with particular emphasis on engineering-related problems. The papers in this set of proceedings were presented at the 5th International Symposium on Engineering Turbulence Modelling and Measurements in September 2002. They look at a variety of areas, including: Turbulence modelling; Direct and large-eddy simulations; Applications of turbulence models; Experimental studies; Transition; Turbulence control; Aerodynamic flow; Aero-acoustics; Turbomachinery flows; Heat transfer; Combustion systems; Two-phase flows. These papers are preceded by a section containing 6 invited papers covering various aspects of turbulence modelling and simulation as well as their practical application, combustion modelling and particle-image velocimetry.

Engineering Turbulence Modelling and Experiments - 4

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Author : D. Laurence
Publisher : Elsevier
ISBN 13 : 0080530982
Total Pages : 975 pages
Book Rating : 4.0/5 (85 download)

Book Synopsis Engineering Turbulence Modelling and Experiments - 4 by : D. Laurence

Download or read book Engineering Turbulence Modelling and Experiments - 4 written by D. Laurence and published by Elsevier. This book was released on 1999-04-14 with total page 975 pages. Available in PDF, EPUB and Kindle. Book excerpt: These proceedings contain the papers presented at the 4th International Symposium on Engineering Turbulence Modelling and Measurements held at Ajaccio, Corsica, France from 24-26 May 1999. It follows three previous conferences on the topic of engineering turbulence modelling and measurements. The purpose of this series of symposia is to provide a forum for presenting and discussing new developments in the area of turbulence modelling and measurements, with particular emphasis on engineering-related problems. Turbulence is still one of the key issues in tackling engineering flow problems. As powerful computers and accurate numerical methods are now available for solving the flow equations, and since engineering applications nearly always involve turbulence effects, the reliability of CFD analysis depends more and more on the performance of the turbulence models. Successful simulation of turbulence requires the understanding of the complex physical phenomena involved and suitable models for describing the turbulent momentum, heat and mass transfer. For the understanding of turbulence phenomena, experiments are indispensable, but they are equally important for providing data for the development and testing of turbulence models and hence for CFD software validation.

Turbulent Boundary Layer on a Cylinder in Axial Flow

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Author :
Publisher :
ISBN 13 :
Total Pages : 66 pages
Book Rating : 4.:/5 (227 download)

Book Synopsis Turbulent Boundary Layer on a Cylinder in Axial Flow by :

Download or read book Turbulent Boundary Layer on a Cylinder in Axial Flow written by and published by . This book was released on 1988 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report reviews research on the turbulent boundary layer that develops on a cylinder in axial flow. Experimental results indicate that the transverse curvature results in a higher coefficient of friction and a fuller velocity profile than for a planar boundary layer. However, appropriate scaling laws and nondimensional scaling parameters are still elusive. The few turbulence measurements such as Reynolds stress and intermittency that are available for a cylindrical boundary layer suggest that the distribution of turbulent quantities in the boundary layer is somewhat different from a planar boundary layer, particularly as the boundary layer becomes thick compared to the radius of the cylinder. This is most likely a result of the tendency for a cylindrical boundary layer to become wake-like as the cylinder becomes very small. Measurements of turbulence intensity and detection of turbulence-generating events in a cylindrical boundary layer suggest that the mechanism for the production of turbulence near the wall is similar to that for other wall-bounded flows. However, there is experimental evidence that the outer flow interacts with the near-wall flow to modify the generation of turbulence. Suggestions for further work include more comprehensive and sophisticated measurements of turbulent quantities in cylindrical boundary layers as well as computational modeling.

Vehicle, Mechatronics and Information Technologies II

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Author : X.D. Yu
Publisher : Trans Tech Publications Ltd
ISBN 13 : 3038264415
Total Pages : 4823 pages
Book Rating : 4.0/5 (382 download)

Book Synopsis Vehicle, Mechatronics and Information Technologies II by : X.D. Yu

Download or read book Vehicle, Mechatronics and Information Technologies II written by X.D. Yu and published by Trans Tech Publications Ltd. This book was released on 2014-03-24 with total page 4823 pages. Available in PDF, EPUB and Kindle. Book excerpt: Collection of selected, peer reviewed papers from the 2014 International Conference on Vehicle & Mechanical Engineering and Information Technology (VMEIT 2014), February 19-20, 2014. The 1058 papers are grouped as follows: Chapter 1: Design and Researches in Area of Vehicle and General Mechanical Engineering, Chapter 2: Power and Electric Systems, Electronics and Microelectronics, Embedded and Integrated Systems, Chapter 3: Measurement and Instrumentation, Monitoring and Detection Technologies, Fault Diagnosis, Chapter 4: Mechatronics, Automation and Control, Chapter 5: Computation Methods and Algorithms for Modeling, Simulation and Optimization, Data Mining and Data Processing, Chapter 6: Communication, Signal and Image Processing, Data Acquisition, Identification and Recognition Technologies, Chapter 7: Information Technologies, WEB and Networks Engineering, Information Security, Software Application and Development, Chapter 8: Material Science, Technologies of Material Processing, Exploration and Mining of Mineral Resources, Chapter 9: Building Materials and Technologies in Construction, Chapter 10: New Technologies in Urban Construction and Environmental Engineering, Chapter 11: Modern Tendency in Area of Management Engineering, Logistics, Economics, Finance and Education, Chapter 12: Applied Research and Solutions in Area of Sports and Physical Training

Nonlinearity, Bifurcation and Chaos

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Author : Jan Awrejcewicz
Publisher : BoD – Books on Demand
ISBN 13 : 9535108166
Total Pages : 360 pages
Book Rating : 4.5/5 (351 download)

Book Synopsis Nonlinearity, Bifurcation and Chaos by : Jan Awrejcewicz

Download or read book Nonlinearity, Bifurcation and Chaos written by Jan Awrejcewicz and published by BoD – Books on Demand. This book was released on 2012-10-24 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nonlinearity, Bifurcation and Chaos - Theory and Application is an edited book focused on introducing both theoretical and application oriented approaches in science and engineering. It contains 12 chapters, and is recommended for university teachers, scientists, researchers, engineers, as well as graduate and post-graduate students either working or interested in the field of nonlinearity, bifurcation and chaos.

Government Reports Announcements & Index

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Author :
Publisher :
ISBN 13 :
Total Pages : 974 pages
Book Rating : 4.E/5 ( download)

Book Synopsis Government Reports Announcements & Index by :

Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1982-08 with total page 974 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Smart Flow Control Processes in Micro Scale Volume 2

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Author : Bengt Sunden
Publisher : MDPI
ISBN 13 : 3039365118
Total Pages : 246 pages
Book Rating : 4.0/5 (393 download)

Book Synopsis Smart Flow Control Processes in Micro Scale Volume 2 by : Bengt Sunden

Download or read book Smart Flow Control Processes in Micro Scale Volume 2 written by Bengt Sunden and published by MDPI. This book was released on 2020-12-29 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years, microfluidic devices with a large surface-to-volume ratio have witnessed rapid development, allowing them to be successfully utilized in many engineering applications. A smart control process has been proposed for many years, while many new innovations and enabling technologies have been developed for smart flow control, especially concerning “smart flow control” at the microscale. This Special Issue aims to highlight the current research trends related to this topic, presenting a collection of 33 papers from leading scholars in this field. Among these include studies and demonstrations of flow characteristics in pumps or valves as well as dynamic performance in roiling mill systems or jet systems to the optimal design of special components in smart control systems.

A Study of the Wall Pressure Fluctuations in a Turbulent Three-dimensional Boundary Layer Around a Cylinder and Plate Model

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Author : Juan H. Agui
Publisher :
ISBN 13 :
Total Pages : 200 pages
Book Rating : 4.:/5 (218 download)

Book Synopsis A Study of the Wall Pressure Fluctuations in a Turbulent Three-dimensional Boundary Layer Around a Cylinder and Plate Model by : Juan H. Agui

Download or read book A Study of the Wall Pressure Fluctuations in a Turbulent Three-dimensional Boundary Layer Around a Cylinder and Plate Model written by Juan H. Agui and published by . This book was released on 1989 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Progress in Hybrid RANS-LES Modelling

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Author : Yannick Hoarau
Publisher : Springer
ISBN 13 : 3319700316
Total Pages : 509 pages
Book Rating : 4.3/5 (197 download)

Book Synopsis Progress in Hybrid RANS-LES Modelling by : Yannick Hoarau

Download or read book Progress in Hybrid RANS-LES Modelling written by Yannick Hoarau and published by Springer. This book was released on 2018-03-09 with total page 509 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book reports on the latest developments in computational fluid dynamics and turbulence modeling, with a special emphasis on hybrid RANS-LES methods and their industrial applications. It gathers the proceedings of the Sixth Symposium on Hybrid RANS-LES Methods, held on September 26-28 in Strasbourg, France. The different chapters covers a wealth of topics such as flow control, aero-acoustics, aero-elasticity and CFD-based multidisciplinary optimization. Further topics include wall-modelled Large Eddy Simulation (WMLES), embedded LES, Lattice-Bolzman methods, turbulence-resolving applications and comparisons between LES, hybrid RANS-LES and URANS methods. The book addresses academic researchers, graduate students, industrial engineers, as well as industrial R&D managers and consultants dealing with turbulence modelling, simulation and measurement, and with multidisciplinary applications of computational fluid dynamics.

U.S. Government Research & Development Reports

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Author :
Publisher :
ISBN 13 :
Total Pages : 224 pages
Book Rating : 4.:/5 (31 download)

Book Synopsis U.S. Government Research & Development Reports by :

Download or read book U.S. Government Research & Development Reports written by and published by . This book was released on 1970 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: