DOCSLIB.ORG

Aeroacoustics in High Speed Trains

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Aeroacoustics in High Speed Trains Universidad Politécnica de Madrid Doctoral dissertation: AEROACOUSTICS IN HIGH SPEED TRAINS by Félix Sorribes Palmer Advisors: Prof. Dr. Ing. Ángel Sanz Andrés Prof. Dr. Ing. Gustavo Alonso Rodrigo E.T.S.I. Aeronáuticos, Universidad Politécnica de Madrid, December 2014 Resumen Este trabajo se centra en el estudio de problemas aeroacústicos en los trenes de alta ve- locidad. Se han considerado dos escenarios en los que las ondas de presión generadas son críticos para el confort de los pasajeros. Uno es el debido a las ondas de presión que genera el tren cuando entra y sale de un túnel, que a su vez producen saltos de presión de baja frecuencia en el tren (cuando se cruzan con él) y en los alrededores del túnel cuando alcanzan la salida. Se estudia este fenómeno, y se propone un sistema aeroelás- tico basado en el galope transversal para disminuir la energía de estas ondas, y se analiza la energía extraíble de las ondas utilizando cuerpos con diferentes secciones transversales [Sorribes-Palmer and Sanz-Andres, 2013]. La influencia de la geometría de los portales en la energía radiada hacia el exterior de túnel es analizada experimentalmente, prestando especial atención a las boquillas porosas. Las ondas de presión en el interior del túnel se han analizado mediante el método de las características. Se han realizado ensayos experimentales para estimar la energía reflejada hacia el interior del túnel al alcanzar las ondas de presión el portal de salida del túnel. Se ha estudiado la formación e interacción entre el portal del túnel y la onda de choque generada en los túneles de gran longitud y pequeña fricción. Se propone un método para describir de forma aproximada el ruido radiado al exterior. Por otro lado se ha estudiado el ruido de media y alta frecuencia de origen aerod- inámico. Se ha estudiado la influencia del desprendimiento de la capa límite sobre el tren. Se propone una metodología basada en una sección de tren característica para predecir rápidamente el nivel de presión de sonido dentro y fuera del tren para todo el rango de frecuencias. Se han realizado medidas experimentales en vía de los espectros de presión sobre la superficie del tren, y de la transmisibilidad de las uniones entre estructura y reves- timiento. Los resultados experimentales se han utilizado en los modelos vibroacústicos. El método de la sección del tren característica es especialmente útil a altas frecuencias cuando todo el tren se puede modelar mediante el ensamblaje de diferentes secciones características utilizando el análisis estadístico de la energía. Summary This work is focused on the study of aeroacoustic problems in high speed trains. We have considered two scenarios in which the pressure waves generated are critical for passengers comfort. The first one is due to the pressure waves generated by a train entering in a tunnel. These waves generate pressure gauges inside the train (when they find each other) and outside of the tunnel portals. This phenomenon has been studied, and an aeroelastic system based on transverse galloping to reduce the energy of these waves is proposed. The maximum extractable energy by using bodies with different cross-section shapes is analyzed. The influence of the portals geometry in the energy radiated outwards the tunnel is analyzed experimentally, with particular attention to the porous exits. The pressure waves inside the tunnel have been analyzed using the method of char- acteristics. Experimental tests to estimate the energy reflected into the tunnel when the pressure waves reach the tunnel portal have been performed. We have studied the genera- tion and interaction between the tunnel portal and a shock wave generated in long tunnels with small friction. A method to describe in an approximated way the pressure radiated outside the tunnel is proposed. In the second scenario, middle and high frequency noise generated aerodynamically has been studied, including the influence of the detachment of the boundary layer around the train. A method based on a train section to quickly predict the sound pressure level inside and outside the train has been proposed. Experimental test have been performed on board to evaluate the pressure power spectra on the surface of the train, and the transmis- sibility of the junctions between the structure and trim. These experimental results have been used in the vibroacoustic models. The low frequency pressure waves generated with the train during the tunnel crossing has been identified in the pressure spectrum. The train characteristic section method is especially useful at high frequencies, when the whole train can be modeled by assembling different sections using the statistical en- ergy analysis. The sound pressure level inside the train is evaluated inside and outside the tunnel. Acknowledgments First of all I would like to acknowledge the director of Instituto Universitario de Micro- gravedad “Ignacio Da Riva”, Prof. Dr. Ing. José Meseguer, for giving me the opportunity to work in the institute. I have been able to work in different areas and learn a lot from many persons in the institute, specially from my advisors Prof. Dr. Ing. Angel Sanz An- drés and Prof. Dr. Ing. Gustavo Alonso Rodrigo, and i want to thank them their patience to listen and explain every time I needed it. I also want to thank the rest of the people of the institute for their support: Álvaro Cuerva, Oscar López, Santiango Pindado, Sebas- tian Franchini, Javier Pérez, Isabel Pérez, Alejandro Martínez, Mohsen Ghaemi, Rafael García, Sergio Ávila, Alejandro Gómez, etc.. I want to thank the late Prof. Dr. Ing. Jesús López Díez for all his help on introducing me to the world of vibroacoustics. I am really grateful to Universidad Politécnica de Madrid for the scholarship to spend a three months visit at TU Berlin, where they let me use their facilities to perform ex- perimental test and also helped me to understand vibroacoustic modeling, this experience was highly useful to focus my work and to push forward this dissertation. I want to thank my friends for cheering my up during the tough moments and for sharing their time with me: Marcos, Diego, Laura, Joseba, Eduardo, Pedro, etc. I render thanks to Dani for reading everything I gave him. Lastly, I would like to thank my family, for their support and encouragement, because having them by my side made everything look possible. And most of all for my loving girlfriend Julija for her patience, unconditional love and faithful support. A life full of possibilities is open to us now, and I am willing to explore it with you “ljubezen”, rtm. Contents Contents i List of Figures iii List of Tables ix 1 Introduction 1 1.1 Noise sources in high speed trains ..................... 1 1.2 Objectives and content structure ...................... 9 2 Pressure waves in high speed railway tunnels 11 2.1 Introduction ................................. 11 2.2 Mathematical model for prediction of pressure waves inside a tunnel . 15 2.2.1 Condition for the existence of a plane wave ............ 16 2.2.2 Propagation of the signature .................... 17 2.3 Hydrostatic pressure influence on high speed railway tunnels cross-section sizing .................................... 22 2.4 Non-linear propagation and pressure wave steepening inside a tunnel . 25 2.5 Pressure wave interaction at the tunnel exit ................. 29 2.6 Experimental set-up ............................ 31 2.7 Results and discussion ........................... 42 2.7.1 Reflected wave at the horns ..................... 42 2.7.2 Reflected and transmitted wave at airshafts ............ 43 2.7.3 Reflected and transmitted wave at a perforated section ....... 44 2.7.4 Reflected wave at perforated exits ................. 45 2.8 Conclusions ................................. 49 3 Energy extraction from aerodynamic instabilities 51 3.1 Introduction ................................. 51 3.2 Mathematical model ............................. 53 3.2.1 Extracted power in a general case ................. 56 3.2.2 Comparison between numerical integration method and polyno- mial expansion ........................... 60 3.2.3 Influence of the number of discretization points .......... 60 i ii CONTENTS 3.2.4 Comparison of the numerical integration method with the polyno- mial expansion at a point different from the origin. ........ 62 3.3 Experimental set-up ............................ 65 3.4 Results and discussion ........................... 67 3.4.1 Biconvex airfoil .......................... 67 3.4.2 D-shape body ............................ 70 3.4.3 Rhomboidal cross-section bodies .................. 72 3.4.4 Triangle cross-section bodies .................... 75 3.4.5 Square cross-section bodies ..................... 76 3.5 Conclusions ................................. 80 4 Interior noise prediction in high speed trains 83 4.1 Introduction ................................. 83 4.2 Numerical analysis ............................. 85 4.2.1 Basic acoustic concepts and definitions .............. 85 4.2.2 Methodology ............................ 93 4.2.3 Structural and fluid models ..................... 93 4.2.4 Loads ................................ 99 4.2.4.1 Structure-borne ...................... 99 4.2.4.2 Airborne .........................101 4.3 Experimental set-up ............................102 4.4 Tests definition ...............................104 4.4.1 Aerodynamic noise characterization ................104 4.4.1.1 SPL in open field .....................104 4.4.1.2 SPL inside a tunnel ....................105 4.4.2 Point junction characterization
Load more

Recommended publications
  • Mitigation of Vortex-Induced Vibrations Using Macro
    Florida State University Libraries Electronic Theses, Treatises and Dissertations The Graduate School 2012 Mitigation of Vortex-Induced Vibrations in Cables Using Macro-Fiber Composites Gustavo J. Munoz Follow this and additional works at the FSU Digital Library. For more information, please contact [email protected] THE FLORIDA STATE UNIVERSITY FSU-FAMU COLLEGE OF ENGINEERING MITIGATION OF VORTEX-INDUCED VIBRATIONS IN CABLES USING MACRO-FIBER COMPOSITES By GUSTAVO J. MUNOZ A Thesis submitted to the Department of Civil and Environmental Engineering in partial fulfillment of the requirements for the degree of Master of Science Degree Awarded: Spring Semester, 2012 Gustavo J. Munoz defended this thesis on March 30, 2012. The members of the supervisory committee were: Sungmoon Jung Professor Directing Thesis Michelle Rambo-Roddenberry Committee Member Lisa K. Spainhour Committee Member The Graduate School has verified and approved the above-named committee members, and certifies that the [thesis/treatise/dissertation] has been approved in accordance with university requirements ii I dedicate this manuscript to my mother, father and wife. I love you. iii ACKNOWLEDGMENTS This thesis is a combination of efforts in different ways from many special people. To begin, my advisor, Sungmoon Jung has worked tirelessly and constantly in ensuring my complete understanding of the work needed to complete this project. Not only did he guide me through my thesis work, he pushed me to reach further than minimum requirements -- arguing that we should tap into all of our potential. He also taught me and guided me through a very particular way of analytical thought while stimulating me to blossom in my own way of scientific thinking.
    [Show full text]
  • Fluid-Structure Interaction in Bluff-Body Aerodynamics and Long-Span Bridge Design: Phenomena and Methods
    Fluid-Structure Interaction in Bluff-Body Aerodynamics and Long-Span Bridge Design: Phenomena and Methods G. Morgenthal CUED/D-STRUCT/TR.187 University of Cambridge Department of Engineering Technical Report No. CUED/D-Struct/TR.187 Fluid-Structure Interaction in Bluff-Body Aerodynamics and Long-Span Bridge Design: Phenomena and Methods by Guido Morgenthal Magdalene College August 2000 Introduction Page 3 ABSTRACT The interaction between a fluid flow and an embedded elastic bluff body is extremely complex. Different response modes and flow phenomena exist depending on the flow characteristics, the body geometry and the structural properties like stiffness and damping. This poses a particular challenge to the development of analytical and numerical models and renders experimental methods still the most reliable tool. This report aims at introducing the various phenomena and at reviewing the most important analytical and numerical methods of analysis. It is largely based on a literature survey which has been carried out in preparation for a PhD degree on numerical methods for fluid-structure interaction analysis in long-span bridge design at the University of Cambridge. Introduction Page 4 CONTENTS ABSTRACT 3 CONTENTS 4 1 INTRODUCTION 6 2 HISTORY OF EARLY AERODYNAMICS 8 3 TYPES OF AEROELASTIC PHENOMENA 10 3.1 Introduction 10 3.2 Vortex-induced vibrations 13 3.2.1 The vortex shedding process 13 3.2.2 Vortex-induced vibrations of structures, the lock-in phenomenon 18 3.2.3 Observed vortex-induced oscillations of bridges 21 3.3 Flutter 21
    [Show full text]
  • Sound Interactions and Control
    Lecture Notes in Mechanical Engineering Yu Zhou A.D. Lucey Yang Liu Lixi Huang Editors Fluid-Structure- Sound Interactions and Control Proceedings of the 3rd Symposium on Fluid-Structure-Sound Interactions and Control Lecture Notes in Mechanical Engineering About this Series Lecture Notes in Mechanical Engineering (LNME) publishes the latest develop- ments in Mechanical Engineering—quickly, informally and with high quality. Original research reported in proceedings and post-proceedings represents the core of LNME. Also considered for publication are monographs, contributed volumes and lecture notes of exceptionally high quality and interest. Volumes published in LNME embrace all aspects, subfields and new challenges of mechanical engineering. Topics in the series include: • Engineering Design • Machinery and Machine Elements • Mechanical Structures and Stress Analysis • Automotive Engineering • Engine Technology • Aerospace Technology and Astronautics • Nanotechnology and Microengineering • Control, Robotics, Mechatronics • MEMS • Theoretical and Applied Mechanics • Dynamical Systems, Control • Fluid Mechanics • Engineering Thermodynamics, Heat and Mass Transfer • Manufacturing • Precision Engineering, Instrumentation, Measurement • Materials Engineering • Tribology and Surface Technology More information about this series at http://www.springer.com/series/11236 Yu Zhou ⋅ A.D. Lucey ⋅ Yang Liu Lixi Huang Editors Fluid-Structure-Sound Interactions and Control Proceedings of the 3rd Symposium on Fluid-Structure-Sound Interactions and Control
    [Show full text]
  • An Improvement of the Time Delayed Quasi-Steady Model for the Oscillations of Circular Cylinders in Cross-Flow
    Journal of Fluids and Structures (1999) 13, 291}307 Article No.: j#s.1999.0204 available online at http://www.idealibrary.com on AN IMPROVEMENT OF THE TIME DELAYED QUASI-STEADY MODEL FOR THE OSCILLATIONS OF CIRCULAR CYLINDERS IN CROSS-FLOW P. HED MON Institut AeHrotechnique/CNAM, 15, rue Marat, F-78210 Saint-Cyr-l+Ecole, France (Received 5 February 1998 and in revised form 18 September 1998) This paper is devoted to an improvement of the time-delayed quasi-steady model for the prediction of the movement-induced vibrations of tubes mounted in tandem or in an in-line bundle. The improvement lies in the physical interpretation and calculation of the time lag which is based on measured steady force coe$cients. In order to calculate the time lag, a mean convection velocity between cylinders is estimated at each time step. A linear analysis of the present model gives a critical velocity which is in good agreement with an unsteady experiment found in the literature. Moreover, limit-cycle amplitudes are relatively well predicted and show that instability is triggered by the time lag, whereas amplitude is governed by nonlinear aerodynamic damping as for a Van der Pol oscillator. ( 1999 Academic Press 1. INTRODUCTION FLOW-INDUCED VIBRATIONS of cylinders mounted in bundles is an important engineering problem in many industrial "elds. Actually, one can "nd many di!erent situations where such vibrations may occur when the cylinders are subjected to cross-#ow. Examples are the e!ect of wind on in-line chimney stacks, on electric power-line bundles and on the cables of suspended bridges, or the e!ect of sea currents on o!shore structures and on risers, and also the e!ect of con"ned and complex #ows in reactors of nuclear power plants and in conventional heat exchangers.
    [Show full text]
  • On Vortex Shedding and Prediction of Vortex-Induced Vibrations of Circular Cylinders
    INEI-NO NTNU Trondheim Norges teknisk-naturvitenskapelige universitet — , Doktor ingenieravhandling 1997:44 1049 Institutt for marine konstraksjoner MTA-rapport 1997:117 cylinders On Vortex Shedding and Prediction of Vortex-Induced Vibrations of Circular Cylinders A thesis submitted in partial fulfillment of the requirements for the degree of doktor ingenipr by Karl H. Halse Trondheim, February 1997 Department of Marine Structures Faculty of Marine Technology Norwegian University of Science and Technology DISCLAIMER Portions of this document may be illegible in electronic image products. Images are produced from the best available original document. Abstract This work addresses the vortex shedding phenomenon and the problem of predicting vortex- induced vibrations of slender marine structures. This high-frequency response form may con ­ tribute significantly to the fatigue damage of a structure. As the development of hydrocarbons moves to deeper waters, the importance of accurately predicting the vortex-induced response has increased. Thus the need for proper response prediction methods is large. The problem of vortex-induced vibrations is a classical example of a fluid-structure interaction problem, which involves both fluid dynamics and structural mechanics. In this work an extensive review of existing research publications about vortex shedding from circular cylinders and the vortex-induced vibrations of cylinders is presented. Furthermore an overview of the different numerical approaches to modelling the fluid flow is given. A comparison study of existing response prediction methods revealed very large deviations be ­ tween the response predicted by the different methods. Differences were observed both in re­ sponse shapes and in vibration amplitudes. Most of the existing prediction methods are based upon simple force expressions, where the flow velocity is the only parameter representing the flow.
    [Show full text]
  • Flow-Induced Vibration of Circular Cylindrical Structures
    ANL-85-51 ANL-85-51 FLOW-INDUCED VIBRATION OF CIRCULAR CYLINDRICAL STRUCTURES by ShoeiSheng Chen BASE TECHNOLOGY ARGONNE NATIONAL LABORATORY, ARGONNE, ILLINOIS Operated by THE UNIVERSITY OF CHICAGO for the U. S. DEPARTMENT OF ENERGY under Contract W-31-109-Eng-38 A major purpose of the Techni- cal information Center is to provide the broadest dissemination possi- ble of information contained in DOE's Research and Development Reports to business, industry, the academic community, and federal, state and local governments. Although a small portion of this report is not reproducible, it is being made available to expedite the availability of information on the research discussed herein. Distribution Category: LMFBR—Components: Base Technology (UC-79k) ANL-85-51 ANL—85-51 DE86 003981 ARGONNE NATIONAL LABORATORY 9700 South Cass Avenue Argonne, Illinois 60439 FLOW-INDUCED VIBRATION OF CIRCULAR CYLINDRICAL STRUCTURES by Shoei-Sheng Chen Components Technology Division DISCLAIMER This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsi- bility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Refer- ence herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recom- mendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof.
    [Show full text]
  • Computational Validation of Aerodynamic Paramenters on a Multi-Sided Cylinder
    University of New Haven Digital Commons @ New Haven Master's Theses Student Works 4-18-2018 Computational Validation of Aerodynamic Paramenters on a Multi-Sided Cylinder Christopher Ong Follow this and additional works at: https://digitalcommons.newhaven.edu/masterstheses Part of the Mechanical Engineering Commons THE UNIVERSITY OF NEW HAVEN COMPUTATIONAL VALIDATION OF AERODYNAMIC PARAMENTERS ON A MULTI-SIDED CYLINDER A THESIS Submitted in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE IN MECHANICAL ENGINEERING BY Christopher Ong University of New Haven West Haven, Connecticut April 4th, 2018 COMPUTATIONAL VALIDATION OF AERODYNAMIC PARAMENTERS ON A MULTI-SIDED CYLINDER APPROVED BY ii ACKNOWLEDGMENTS I would like to thank my thesis advisor, Dr. Byungik Chang of the University of New Haven, for guiding the thesis work. Dr. Chang has been a helpful, guiding hand throughout the duration of my Master’s studies. He has given me guidance and provided many opportunities for me to grow as a student. I would like to thank Dr. Carnasciali and Dr. Gorthala for serving on the thesis committee. Dr. Carnasciali has aided and advised me during my thesis work regarding CFD and fluid dynamics. Dr. Gorthala has mentored me through my undergraduate and graduate course work, as well as other endeavors. I would like to thank my parents for being supportive and supporting me as I pursued my education at the University of New Haven. I would also like to thank my brother for his assistance during my time completing my Master’s degree. iii ABSTRACT There are fundamental problems in fluid dynamics.
    [Show full text]
  • 2 Vibration Induced by Cross-Flow
    Flow-Induced Vibrations This page intentionally left blank Flow-Induced Vibrations Classifications and Lessons from Practical Experiences Editors Shigehiko Kaneko Tomomichi Nakamura Fumio Inada Minoru Kato Technical Section on Flow-Induced Vibrations JSME DMC Division English Translation Editor Njuki W. Mureithi AMSTERDAM • BOSTON • HEIDELBERG • LONDON • NEW YORK • OXFORD PARIS • SAN DIEGO • SAN FRANCISCO • SINGAPORE • SYDNEY • TOKYO Elsevier The Boulevard, Langford Lane, Kidlington, Oxford OX5 1GB, UK Radarweg 29, PO Box 211, 1000 AE Amsterdam, The Netherlands First edition 2008 Copyright © 2008 Elsevier Ltd. All rights reserved No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any means electronic, mechanical, photocopying, recording or otherwise without the prior written permission of the publisher. Permissions may be sought directly from Elsevier ’ s Science & Technology Rights Department in Oxford, UK: phone (+44) (0) 1865 843830; fax (+44) (0) 1865 853333; email: [email protected]. Alternatively, you can submit your request online by visiting the Elsevier web site at http://elsevier.com/locate/permissions , and selecting Obtaining permission to use Elsevier material Notice: No responsibility is assumed by the publisher for any injury and/or damage to persons or property as a matter of products liability, negligence or otherwise, or from any use or operation of any methods, products, instructions or ideas contained in the material herein. Because of rapid advances in the medical sciences, in particular, independent verification of diagnoses and drug dosages should be made. British Library Cataloguing-in-Publication Data A catalogue record for this book is available from the British Library Library of Congress Cataloging-in-Publication Data A catalog record for this book is available from the Library of Congress ISBN: 978-0-08-044954-8 For information on all Elsevier publications visit our web site at books.elsevier.com Typeset by Charon Tec Ltd., A Macmillan Company.
    [Show full text]
  • On the Interaction Between Vortex-Induced Vibrations
    On the Interaction between vortex-induced vibrations and galloping in rectangular cylinders of low side ratio Dissertation VXEPLWWHGWRDQGDSSURYHGE\WKH 'HSDUWPHQWRI$UFKLWHFWXUH&LYLO(QJLQHHULQJDQG(QYLURQPHQWDO6FLHQFHV 8QLYHUVLW\RI%UDXQVFKZHLJ±,QVWLWXWHRI7HFKQRORJ\ DQGWKH 'HSDUWPHQWRI&LYLODQG(QYLURQPHQWDO(QJLQHHULQJ 8QLYHUVLW\RI)ORUHQFH LQFDQGLGDF\IRUWKHGHJUHHRID Doktor-Ingenieur (Dr.-Ing.) / Dottore di Ricerca in Processes, Materials and Constructions in Civil and Environmental Engineering and for the Protection of the Historic- Monumental Heritage*) E\ 7RPPDVR0DVVDL ERUQ IURP%DJQRD5LSROL ), ,WDO\ 6XEPLWWHGRQ 2UDOH[DPLQDWLRQRQ 3URIHVVRULDODGYLVRUV 3URI*LDQQL%DUWROL 3URI.ODXV7KLHOH 2016 (LWKHUWKH*HUPDQRUWKH,WDOLDQIRUPRIWKHWLWOHPD\EHXVHG Statement of Originality I, Tommaso Massai, the undersigned, declare that this thesis and the material presented in it are, to the best of my knowledge and belief, original and my own work and contains no material previously published or written by another person, except where due reference is made in the text of the thesis. I confirm that: ● The work was done during candidature for the research degree at the International PhD between the University of Florence and the Technische Universit¨at Carolo- Wilhelmina zu Braunschweig. ● Where I have consulted the published work of others, it is clearly attributed. ● Where I have quoted from the work of others, the source is always given. ● I have mainly used Open-Source Software and they are cited within the dissertation; where I have used proprietary software
    [Show full text]
  • Wind Engineering Terminology
    1 Wind Engineering Terminology Nicholas Isyumov1 1Professor Emeritus, The Boundary Layer Wind Tunnel Laboratory, University of Western Ontario, London Ontario, Canada email: [email protected] ABSTRACT: This paper provides an overview of the technical terminology of wind engineering. It is intended to promote its use and to encourage its expansion. The non-dimensional numbers, concepts and ideas which are presented in this paper reflect my interests and should not be regarded as all inclusive. There are other terms which have been given only fleeting attention and some that have not been mentioned at all. Section 2, which presents the terminology used in wind tunnel model studies is the kernel of the paper. It includes such important terms as the Jensen (Je), Reynolds (Re), Scruton (Sc), Strouhal (St), Froude (Fr) and Cauchy (Ca) numbers and discusses their roles in the scaling of wind tunnel experiments and in the interpretation of their results. Also discussed are aeroelastic model studies. Section 3 discusses new additions to our terminology, including the Davenport Chain and the Tachikawa number (Ta). Wind speed scales used to describe and categorize various types of wind storms and their effects on the natural and built environments are discussed in Section 4. Current design procedures and methods of wind tunnel model testing are based on the concept that natural wind can be described as a locally stationary, turbulent boundary layer flow. This model of natural wind has served us well in describing winds in tropical and extra-tropical cyclones. However, the concept of steady “straight line” winds does not capture the effects of severe transient wind events such as tornadoes, thunderstorms and downbursts.
    [Show full text]
  • 05Th WEGEMT Workshop on Non Linear Wave Action on Structures
    Book Ref. T098001 Vth WEGEMT WORKSHOP fl~aLOGEA& WAVE STRUCTUlRES AM© SIP3 W (4th September 1998 Venue EGEMT University Toulon-Var France W~EGEMT A European Association of Universities in oU Lo.O VAR Marine Technologies and related Sciences Vth WEGEMT WORKSHOP NON-LINEAR WAVE ACTION ON STRUCTURES AND SHIPS University Toulon-Var France 4th september 1998 * AZEMER Ville de La Seyne Sur Mer N S I CQNSEIL A- GENERAL Information / Workshop Secretary Vincent REY, Wegeit Workshop Secretary. ISIiTV. 1I1 56. 83162 I.i Valcue dui Var (cdex. FRANCI." Fax: +33 (0)4 94 14 24 48. E-mail: rey (0isit,.uii v-t In. f' ABOUT WEGEMT WEGEMT is a European Association of 42 Universities in 17 countries. It was formed in 1978 with the aim of increasing the knowledge base and updating and extending the skills and competence of engineers and postgraduate students working at an advanced level in marine technology and related sciences. WEGEMT achieves this aim by encouraging universities to be associated with it, to operate as a network and therefore actively collaborate in initiatives relevant to this aim. WEGEMT considers collaborative research, education and training at an advanced level, and the exchange and dissemination of information, as activities which further the aim of the Association. N-B For marine technology and related sciences, WEGEMT includes all aspects of offshore oil and gas exploration and production, shipping and shipbuilding, underwater technologies and other interdisciplinary areas concerned with the oceans and seas. ABOUT THE PUBLICATION This publication represents a series of lecturers' papers, which were presented at a one-day Workshop entitled Non-linear Wave action of Structures and Ships presented at the Universit6 Toulon Var on Friday 4 September 1998.
    [Show full text]
  • Numerical Simulation of the Fluid–Structure Interaction in a Tube Array Under Cross Flow at Moderate and High Reynolds Number V
    Numerical simulation of the fluid–structure interaction in a tube array under cross flow at moderate and high Reynolds number V. Shinde, T. Marcel, Yannis Hoarau, T. Deloze, Gilles Harran, F. Baj, J. Cardolaccia, J.P. Magnaud, E. Longatte, Marianna Braza To cite this version: V. Shinde, T. Marcel, Yannis Hoarau, T. Deloze, Gilles Harran, et al.. Numerical simulation of the fluid–structure interaction in a tube array under cross flow at moderate and high Reynolds number. Journal of Fluids and Structures, Elsevier, 2014, 47, pp.99-113. 10.1016/j.jfluidstructs.2014.02.013. hal-02860426 HAL Id: hal-02860426 https://hal.archives-ouvertes.fr/hal-02860426 Submitted on 19 Aug 2020 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Numerical simulation of the fluid structure interaction in a tube array under cross flow at moderate and high Reynolds number V. Shindea, T. Marcelb, Y. Hoarau*c, T. Delozeb, G. Harranb, F. Bajd, J. Cardolacciad, J.P. Magnaudd, E. Longattea, M. Brazab aLaboratoire de M´ecanique des Structures Industrielles Durables, LaMSID - UMR EDF CNRS 2832, France bInstitut de M´ecanique des Fluides de Toulouse, IMFT- UMR CNRS 5502, France cICUBE, Universit´ede Strasbourg, UMR CNRS 7357, France dCommissariat `al'Energie´ Atomique (CEA), France Abstract The unsteady loads in a tube bundle are studied at moderate and high Reynolds number by means of URANS and hybrid (DDES) modelling.
    [Show full text]