Vortex-Induced Vibration Studies of Arch Bridge Hanger. by CFD numerical simulation
|
|
- Erik Horton
- 5 years ago
- Views:
Transcription
1 Vorte-Induced Vibration Studies of Arch Bridge Hanger by CFD numerical simulation Hao Zhan 1,Tao Fang 2,Zhiguo Zhang 3 1 China Railway Major Bridge Reconnaissance & Design Institute Co., Ltd.,China poetryzhanhao@163.com 2 Huazhong University of Science and Technology,China 3 University of Shanghai for Science & Technology,China Abstract By secondary development of software FLUENT,this paper establishes two-dimensional bending fluid-structure interaction numerical model to study vorte-induced vibration of steel bo hanger of one arch bridge under different wind attack angle.the numerical result shows: When the wind is blowing along the bridge,the maimum amplitude and lock-in wind speed domains are biggest.it is the most unfavorable direction for vorte induce vibration. When the wind is blowing perpendicular to the bridge,vorte-induced vibrated does not happen. When the wind is blowing along oblique direction.vorte-induced vibrated may along -ais direction or along y-ais direction. It depends on wind speed.this article also study the phase of lift force, vertical displacements and acceleration when vorte vibration happens, reveals the inherent reasons of structural damping effecting on vorte-induced vibration. 1 Introduction Nanjing Dashengguan Yangtze River bridge is a continuous steel truss arch bridge with a span arrangement of 19m+192m+336m+336m+192m+19m.The 336 meters main span is the longest of similar bridges in the world.it is first si line high-speed railway bridge with the largest railway loading in the world. Chamfered rectangle steel bo hanger is used in the bridge. The longest hanger is above 5m. Vorte-induced vibration is easy to happen. An etensive research have been done on vorte-induced vibration.but major research is focus on circular and rectangle section and seldom connect with the actual engineering, especially vorte-induced vibration under oblique wind direction(m.matsumoto et al., 1998; S.Pastò,28; Xavier Amandolèse et al.,21).by secondary development of commercial computational fluid dynamics software FLUENT, this paper establishes two-dimensional bending fluid-structure interaction numerical model to study vorte-induced vibration of the steel truss arch bridge hanger. The maimum amplitude and lock-in wind speed domains were calculated at different wind attack angular in the paper. Bridge pictures are shown in Figure 1.
2 Rendered picture Bridge hanger Cross-section of hanger(mm) Figure1: Bridge picture 2 Numerical simulation 2.1 Numerical simulation model Properties of the hanger is shown in Table1.It is the longest hanger of bridge which is about 56m.Wind direction in the numerical simulation is shown in Figure 2. Numerical simulation model is according to prototype of the structure.the 1/1 scale model is used in section wind tunnel test. y Table1: Properties of prototype hanger Mass (kg/m) Vibration frequency in y-ais direction(hz) 2.81 Vibration frequency in -ais direction (Hz) 2.14 y' y wind wind 27 ' wind y -ais direction oblique direction y-ais direction Figure 2: Wind direction 2.2 Numerical simulation principle The structure is regarded as mass, spring and damping system.the schematic diagram of numerical simulation is shown in Figure 3.The governing structural equation for the one-degree-of -freedom heaving mode is shown as equation (1) and equation (2). Figure 3: Schematic diagram of numerical simulation + + = (1) my + cyy + k yy = Fy my c y k y F (2)
3 where m is the mass per unit length of the body, k is the translational spring stiffness, c is the structural damping coefficients. F is the fluid forces. y denotes the transverse location. The governing equations of the incompressible flow is the continuity equation and the Navier-Stokes equations as equation (3) and equation (4). V = (3) V ( V ) V = p + μ V (4) t ρ where ρ is the density of fluid. V, p, tdenote the velocity vector,pressure and time. Solve equation (3),(4),obtain pressure and velocity around object,calculate aerodynamic force acting on the object. This can be done by FLUENT. Then etract lift and moment into vibration equation (1) (2) and solve the vibration equation by Newmark method.the velocity is assigned to the object and simulate object move by FLUENT dynamic mesh technique. This can be done by secondary development of FLUENT which program code is embedded to the FLUENT by user defined function(udf). Computational grid is shown in Figure 4. Whole mesh Local mesh Figure 4: Computational grid As shown in Figure 4,Numerical grid consists of two parts: Boundary layer surrounding subject is composed of structure mesh and outside is composed of structure mesh.a fine grid is created near the body and the grid becomes gradually coarser in the wake and in the far field. Wind direction is from left to right.left side is set speed entrance and right side is set free flow. Upper and lower boundary are no-slip boundary. Navier-Stokes equations are solved by using finite volume method,second-order upwind difference form and SMPLEC algorithm.rng k-e turbulence model is used in numerical simulation. 3 Numerical simulation results 3.1 St and critical wind velocity of vorte-induced vibration When the wind blow along the bridge, the static flow results are shown in Table 2.Critical wind speed of vorte-induced vibration is Vcrit = fd/ St (1), where D is the cross-wind dimension of the body; f is natural frequency of the structure. St is Strouhal number. It can be obtained by FLUENT. Table 2: St and critical wind velocity ( Southwest Jiao Tong University,26) Wind St Critical wind speed (m/s) Direction Simulation Test Simulation Test -ais Oblique.21 / Vibrationin-ais: 2.9 / Vibrationiny-ais: 15.9 y-ais As shown in Table 2. St and critical wind velocity are in agreement with the wind tunnel test.
4 3.2 Vertical displacements versus velocity and lock -in wind speed domains maimum amplitude(cm) wind speed( m/s) vorte-shedding frequency(hz) wind speed( m/s) Wind is along -ais direction and vibration is in y-ais direction. maimum amplitude(cm) wind speed(m/s) vorte-shedding frequency(hz) wind speed(m/s) maimum amplitude(cm) Wind is along oblique direction and vibration is in y-ais direction wind speed(m/s) vorte-shedding frequency(hz) wind speed(m/s) Wind is along oblique direction and vibration is in -ais direction. Figure 5:Vertical displacements versus velocity Figure 6: Vorte-shedding frequency versus velocity As shown in Figure 5 and Figure 6, the amplitude of hanger increases with the wind in the beginning. Access to the locking wind region resonance happen, amplitude increases rapidly. When the wind speed increases again, amplitude decreases.in a certain range of wind speeds, vorte shedding frequency is no longer the linear function of the speed.it is captured by natural frequency of structure y-ais direction vibration V=28m/s (Wind is along -ais ) (m) 196s~2s
5 (m) y-ais direction vibration 132s~135s V=22m/s (Wind is along oblique direction ).1.1 (m) (m) -ais direction vibration 175s~18s V=16.5m/s (Wind is along oblique direction ) Figure 7:Time histories of vertical displacements Figure 8: Time histories of displacements As shown in Figure 7 and Figure 8, the amplitude of vorte-induced vibration is growing gradually, finally stabilize at a constant value.the vibration orbit is ellipse and usually the displacement along the wind direction is very small. Table 3: Results by numerical simulation Wind direction Maimum amplitude(cm) Lock-in wind speed domains(m/s) -ais y-ais 18 22~29 y-ais -ais 1 / Oblique -ais 41 21~22.2 y-ais 19 16~16.5 As shown in Table 2,When the wind is blowing along the bridge (-ais direction), The maimum amplitude and lock-in wind speed domains are biggest. When the wind is blowing perpendicular to the bridge (y-ais direction),vorte-induced vibrated does not happen. When the wind is blowing along oblique direction.vorte-induced vibration may be in -ais direction or y-ais direction. It depends on wind speed.rms amplitude is shown in Table 4. Table 4: Maimal rms amplitude(southwest Jiao Tong University,26) Wind direction Maimal rms amplitude(cm) Wind tunnel test Numerical simulation -ais 7 78 y-ais <2 1 Although there is difference between numerical simulation and the wind tunnel test in properties of hanger, it is an useful reference. Contours of vorticity magnitude is shown in Figure 9. The maimum amplitude is about 1m.Vorte shedding is very strong.
6 Figure 9: Contours of vorticity magnitude (Wind is along -ais direction, V=26m/s) 3.3 Damping ratio influence on vorte-induced vibration Time histories of some parameters are shown in Figure 1.The phase of lift force,vertical displacements and acceleration have been studied in the following.it reveals the inherent reason of structural damping effect on the amplitude of the vorte-induced vibration. 1 5 F(N) Time histories of lift force Time histories of vertical displacements a(m/s 2 ) Time histories of acceleration Figure 1: Time histories of parameters(wind is along -ais direction, V=27m/s) As shown in Figure 1,When time is 257 seconds, Vertical force reach the maimum value. Vertical displacement is very small and almost zero. Displacement is behind the load 1/4 cycles. The acceleration is very small and almost zero. So restoring force and inertia force is very small, the load is mainly balanced by damping force.as shown in Figure 11. When damping ratio is.5,the maimum amplitude is about 2cm, which is 2% of that when damping ratio is.1.before the bridge open to public. The hanger vibrate with amplitudes reported to be above 8cm at the wind speed about 14m/s. After the dampers were installed inside hanger, It has not shown any ecessive vibrations.
7 maimum amplitude( cm) wind speed( m/s) Figure 11: Vertical displacements versus velocity(wind is along -ais direction ( ζ =.5 )) 3.4 Lock-in process of vorte-induced vibration Time histories of lift coefficient are shown in Figure 12.From power spectral density of time histories of lift coefficient at different time,we know the change of vorte shedding frequency. Figure 12: Time histories of lift coefficient(v=27m/s,wind is along -ais) ~8s 8s~12s 12s~26s Figure 13: Time histories of lift coefficient Figure 14: Power spectral density
8 As shown in Figure 13 and Figure 14,~8 seconds, vorte shedding frequency is 3.3Hz which is equivalent to static flow condition.8~12s,there are two frequencies that are 3.3Hz and 2.8Hz.Vorte shedding frequency and the natural frequency of object appear alternately.12 ~ 26 seconds,vorte shedding frequency is 2.8Hz which is captured by inherent frequency of the object. 3.5 Phase plane We can see the phase points etend outward with the time in Figure 15, gradually reached a stable limit cycle.vorte-induced vibration is limiting vibration v(m/s) Figure 15: Phase plane (V=27m/s,wind is along -ais direction ) 4 Conclusions The major results obtained in this study are summarized as follows: 1.Vorte-induced vibration shows different characteristics at different wind attack angle.when the wind is blowing along the bridge, The maimum amplitude and lock-in wind speed domains are biggest.as to the bridge it is the most unfavorable direction for vorte induced vibration. 2.Structural damping ratio has great influence on the amplitude of vorte-induced vibration.it is an efficient way to install damping device to mitigate the vorte-induced vibration. 3.Lock-in process is a gradual process that vorte shedding frequency is gradually captured by inherent frequency of the structure. Vorte-induced vibration is a limiting vibration by phase plane analysis. References M.Matsumoto,H.Ishizaki,C.Matsuoka,etc.Aerodynamic effect of the angle of attack on rectangular prism.journal of Wind Engineering and Industrial Aerodynamic,77&78(1998) S.Pastò.Vorte-induced vibrations of a circular cylinder in laminar an turbulent flows.journal of Fluids and Structures,24(28) Xavier Amandolèse,Pascal Hémon.Vorte-induced vibration of a square cylinder in wind tunnel.comptes Rendus Mecanique,338(21) Wind tunnel test study report of aerodynamic measures to mitigate hanger oscillation of Nanjin Dashenguan Bridge.Southwest Jiao Tong University,26.
Quantification of the Effects of Turbulence in Wind on the Flutter Stability of Suspension Bridges
Quantification of the Effects of Turbulence in Wind on the Flutter Stability of Suspension Bridges T. Abbas 1 and G. Morgenthal 2 1 PhD candidate, Graduate College 1462, Department of Civil Engineering,
More informationInfluence of rounding corners on unsteady flow and heat transfer around a square cylinder
Influence of rounding corners on unsteady flow and heat transfer around a square cylinder S. K. Singh Deptt. of Mech. Engg., M. B. M. Engg. College / J. N. V. University, Jodhpur, Rajasthan, India Abstract
More informationAerodynamic Measures for the Vortex-induced Vibration of π-shape Composite Girder in Cable-stayed Bridge
Aerodynamic Measures for the Vortex-induced Vibration of π-shape Composite Girder in Cable-stayed Bridge *Feng Wang 1), Jialing Song 2), Tuo Wu 3), and Muxiong Wei 4) 1), 2, 3), 4) Highway School, Chang
More informationJournal of Engineering Science and Technology Review 9 (5) (2016) Research Article. CFD Simulations of Flow Around Octagonal Shaped Structures
Jestr Journal of Engineering Science and Technology Review 9 (5) (2016) 72-76 Research Article JOURNAL OF Engineering Science and Technology Review www.jestr.org CFD Simulations of Flow Around Octagonal
More informationGeometry Modification For Minimizing The Aeroelastics Effect
Geometry Modification For Minimizing The Aeroelastics Effect Fariduzzaman a, Subagyo a, Fadilah Hasim a and Matza Gusto Andika a a Aero-Gas dynamics and Vibration Laboratory (LAGG), BPPT, PUSPIPTEK, Serpong
More informationGEA FOR ADVANCED STRUCTURAL DYNAMIC ANALYSIS
SMART SOLUTIONS FOR VIBRATION MONITORING GEA FOR ADVANCED STRUCTURAL DYNAMIC ANALYSIS ANALYSIS OF CIVIL STRUCTURES - EXPO MERLATA PEDESTRIAN BRIDGE ABSTRACT Civil structures and in particular bridges and
More informationThe Seventh International Colloquium on Bluff Body Aerodynamics and Applications (BBAA7) Shanghai, China; September 2-6, 2012 Wind tunnel measurements
The Seventh International Colloquium on Bluff Body Aerodynamics and Applications (BBAA7) Shanghai, China; September 2-6, 2012 Wind tunnel measurements of aeroelastic guyed mast models a, Tomasz Lipecki
More informationCOMPUTATIONAL FLOW MODEL OF WESTFALL'S LEADING TAB FLOW CONDITIONER AGM-09-R-08 Rev. B. By Kimbal A. Hall, PE
COMPUTATIONAL FLOW MODEL OF WESTFALL'S LEADING TAB FLOW CONDITIONER AGM-09-R-08 Rev. B By Kimbal A. Hall, PE Submitted to: WESTFALL MANUFACTURING COMPANY September 2009 ALDEN RESEARCH LABORATORY, INC.
More informationOPTIMIZING THE LENGTH OF AIR SUPPLY DUCT IN CROSS CONNECTIONS OF GOTTHARD BASE TUNNEL. Rehan Yousaf 1, Oliver Scherer 1
OPTIMIZING THE LENGTH OF AIR SUPPLY DUCT IN CROSS CONNECTIONS OF GOTTHARD BASE TUNNEL Rehan Yousaf 1, Oliver Scherer 1 1 Pöyry Infra Ltd, Zürich, Switzerland ABSTRACT Gotthard Base Tunnel with its 57 km
More informationControl of surge and pitch motions of a rectangular floating body using internal sloshing phenomena. Minho Ha and *Cheolung Cheong 1)
Control of surge and pitch motions of a rectangular floating body using internal sloshing phenomena Minho Ha and *Cheolung Cheong 1) School of Mechanical Engineering, PNU, Busan 609-735, Korea 1) ccheong@pusan.ac.kr
More informationCFD Analysis ofwind Turbine Airfoil at Various Angles of Attack
IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE) e-issn: 2278-1684,p-ISSN: 2320-334X, Volume 13, Issue 4 Ver. II (Jul. - Aug. 2016), PP 18-24 www.iosrjournals.org CFD Analysis ofwind Turbine
More informationThe Usage of Propeller Tunnels For Higher Efficiency and Lower Vibration. M. Burak Şamşul
The Usage of Propeller Tunnels For Higher Efficiency and Lower Vibration M. Burak Şamşul ITU AYOC 2014 - Milper Pervane Teknolojileri Company Profile MILPER is established in 2011 as a Research and Development
More informationWind Flow Model of Area Surrounding the Case Western Reserve University Wind Turbine
Wind Flow Model of Area Surrounding the Case Western Reserve University Wind Turbine Matheus C. Fernandes 1, David H. Matthiesen PhD *2 1 Case Western Reserve University Dept. of Mechanical Engineering,
More informationAERODYNAMIC CHARACTERISTICS OF NACA 0012 AIRFOIL SECTION AT DIFFERENT ANGLES OF ATTACK
AERODYNAMIC CHARACTERISTICS OF NACA 0012 AIRFOIL SECTION AT DIFFERENT ANGLES OF ATTACK SUPREETH NARASIMHAMURTHY GRADUATE STUDENT 1327291 Table of Contents 1) Introduction...1 2) Methodology.3 3) Results...5
More informationThe Study on the Influence of Gust Wind on Vehicle Stability Chen Wang a, Haibo Huang b*, Shaofang Xu c
Applied Mechanics and Materials Submitted: 214-6-4 ISSN: 1662-7482, Vol. 598, pp 198-21 Accepted: 214-6-4 doi:1.428/www.scientific.net/amm.598.198 Online: 214-7-16 214 Trans Tech Publications, Switzerland
More informationNumerical Simulation And Aerodynamic Performance Comparison Between Seagull Aerofoil and NACA 4412 Aerofoil under Low-Reynolds 1
Advances in Natural Science Vol. 3, No. 2, 2010, pp. 244-20 www.cscanada.net ISSN 171-7862 [PRINT] ISSN 171-7870 [ONLINE] www.cscanada.org *The 3rd International Conference of Bionic Engineering* Numerical
More informationInvestigation on 3-D Wing of commercial Aeroplane with Aerofoil NACA 2415 Using CFD Fluent
Investigation on 3-D of commercial Aeroplane with Aerofoil NACA 2415 Using CFD Fluent Rohit Jain 1, Mr. Sandeep Jain 2, Mr. Lokesh Bajpai 3 1PG Student, 2 Associate Professor, 3 Professor & Head 1 2 3
More informationDesign process to evaluate potential of wind noise at façade elements
Design process to evaluate potential of wind noise at façade elements Dr.Cristina Paduano 1, Dr.Jennifer Keenahan 1, Réamonn Mac Réamoinn 1 1 Arup, 50 Ringsend Road, Dublin 4, Ireland email: cristina.paduano@arup.com,
More informationLesson 14: Simple harmonic motion, Waves (Sections )
Circular Motion and Simple Harmonic Motion The projection of uniform circular motion along any ais (the -ais here) is the same as simple harmonic motion. We use our understanding of uniform circular motion
More informationComputational Investigation of Airfoils with Miniature Trailing Edge Control Surfaces
AIAA-24-5 Computational Investigation of Airfoils with Miniature Trailing Edge Control Surfaces Hak-Tae Lee, Ilan M. Kroo Stanford University, Stanford, CA 9435 Abstract Miniature trailing edge effectors
More informationPressure coefficient on flat roofs of rectangular buildings
Pressure coefficient on flat roofs of rectangular buildings T. Lipecki 1 1 Faculty of Civil Engineering and Architecture, Lublin University of Technology, Poland. t.lipecki@pollub.pl Abstract The paper
More informationNumerical Simulations of a Train of Air Bubbles Rising Through Stagnant Water
Numerical Simulations of a Train of Air Bubbles Rising Through Stagnant Water Hong Xu, Chokri Guetari ANSYS INC. Abstract Transient numerical simulations of the rise of a train of gas bubbles in a liquid
More informationPHYS 102 Quiz Problems Chapter 16 : Waves I Dr. M. F. Al-Kuhaili
PHYS 102 Quiz Problems Chapter 16 : Waves I Dr. M. F. Al-Kuhaili 1. (TERM 001) A sinusoidal wave traveling in the negative x direction has amplitude of 20.0 cm, a wavelength of 35.0 cm, and a frequency
More informationAPPLICATION OF PUSHOVER ANALYSIS ON EARTHQUAKE RESPONSE PREDICATION OF COMPLEX LARGE-SPAN STEEL STRUCTURES
APPLICATION OF PUSHOVER ANALYSIS ON EARTHQUAKE RESPONSE PREDICATION OF COMPLEX LARGE-SPAN STEEL STRUCTURES J.R. Qian 1 W.J. Zhang 2 and X.D. Ji 3 1 Professor, 3 Postgraduate Student, Key Laboratory for
More informationAerodynamics of Winglet: A Computational Fluid Dynamics Study Using Fluent
Aerodynamics of : A Computational Fluid Dynamics Study Using Fluent Rohit Jain 1, Mr. Sandeep Jain, Mr. Lokesh Bajpai 1PG Student, Associate Professor, Professor & Head 1 Mechanical Engineering Department
More informationAerodynamic Performance of Trains with Different Longitudinal Section Lines under Crosswind
2017 2nd International Conference on Industrial Aerodynamics (ICIA 2017) ISBN: 978-1-60595-481-3 Aerodynamic Performance of Trains with Different Longitudinal Section Lines under Crosswind Taizhong Xie
More informationNUMERICAL SIMULATION OF CROSS-FLOW AROUND FOUR CIRCULAR CYLINDERS IN-LINE SQUARE CONFIGURATION NEAR A PLANE WALL
NUMERICAL SIMULATION OF CROSS-FLOW AROUND FOUR CIRCULAR CYLINDERS IN-LINE SQUARE CONFIGURATION NEAR A PLANE WALL A. Grummy Wailanduw 1, Triyogi Yuwono 2 and Wawan Aries Widodo 2 1 Student of Doctoral Program
More informationTHE TACOMA NARROWS BRIDGE FAILURE Revision A
By Tom Irvine Email: tomirvine@aol.com December 29, 1999 THE TACOMA NARROWS BRIDGE FAILURE Revision A Introduction The original Tacoma Narrows Bridge was opened to traffic on July 1, 1940. It was located
More informationMODELING AND SIMULATION OF VALVE COEFFICIENTS AND CAVITATION CHARACTERISTICS IN A BALL VALVE
Proceedings of the 37 th International & 4 th National Conference on Fluid Mechanics and Fluid Power FMFP2010 December 16-18, 2010, IIT Madras, Chennai, India FMFP2010 341 MODELING AND SIMULATION OF VALVE
More informationEDEXCEL NATIONALS UNIT 6 MECHANICAL PRINCIPLES and APPLICATIONS. ASSIGNMENT No. 4
EDEXCEL NATIONALS UNIT 6 MECHANICAL PRINCIPLES and APPLICATIONS ASSIGNMENT No. 4 NAME: I agree to the assessment as contained in this assignment. I confirm that the work submitted is my own work. Signature
More informationVibration of floors and footfall analysis
Webinar Autodesk Robot Structural Analysis Professional 20/04/2016 Vibration of floors and footfall analysis Artur Kosakowski Rafał Gawęda Webinar summary In this webinar we will focus on the theoretical
More informationCFD Study of Solid Wind Tunnel Wall Effects on Wing Characteristics
Indian Journal of Science and Technology, Vol 9(45), DOI :10.17485/ijst/2016/v9i45/104585, December 2016 ISSN (Print) : 0974-6846 ISSN (Online) : 0974-5645 CFD Study of Solid Wind Tunnel Wall Effects on
More informationINSTRUMENT INSTRUMENTAL ERROR (of full scale) INSTRUMENTAL RESOLUTION. Tutorial simulation. Tutorial simulation
Lab 1 Standing Waves on a String Learning Goals: To distinguish between traveling and standing waves To recognize how the wavelength of a standing wave is measured To recognize the necessary conditions
More informationet al. [25], Noack et al. [26] for circular cylinder flows, Van Oudheusden [27] for square cylinder and Durgesh [28] for a flat plate model. The first two modes appear as phase-shifted versions of each
More informationStudy of Passing Ship Effects along a Bank by Delft3D-FLOW and XBeach1
Study of Passing Ship Effects along a Bank by Delft3D-FLOW and XBeach1 Minggui Zhou 1, Dano Roelvink 2,4, Henk Verheij 3,4 and Han Ligteringen 2,3 1 School of Naval Architecture, Ocean and Civil Engineering,
More informationNumerical simulation and analysis of aerodynamic drag on a subsonic train in evacuated tube transportation
Journal of Modern Transportation Volume 20, Number 1, March 2012, Page 44-48 Journal homepage: jmt.swjtu.edu.cn DOI: 10.1007/BF03325776 1 Numerical simulation and analysis of aerodynamic drag on a subsonic
More information1. A tendency to roll or heel when turning (a known and typically constant disturbance) 2. Motion induced by surface waves of certain frequencies.
Department of Mechanical Engineering Massachusetts Institute of Technology 2.14 Analysis and Design of Feedback Control Systems Fall 2004 October 21, 2004 Case Study on Ship Roll Control Problem Statement:
More informationPre AP Physics: Unit 7 Vibrations, Waves, and Sound. Clear Creek High School
Pre AP Physics: Unit 7 Vibrations, Waves, and Sound Clear Creek High School Simple Harmonic Motion Simple Harmonic Motion Constant periodic motion of an object. An object oscillates back and forth along
More informationAE Dept., KFUPM. Dr. Abdullah M. Al-Garni. Fuel Economy. Emissions Maximum Speed Acceleration Directional Stability Stability.
Aerodynamics: Introduction Aerodynamics deals with the motion of objects in air. These objects can be airplanes, missiles or road vehicles. The Table below summarizes the aspects of vehicle performance
More informationNumerical simulation of aerodynamic performance for two dimensional wind turbine airfoils
Available online at www.sciencedirect.com Procedia Engineering 31 (2012) 80 86 International Conference on Advances in Computational Modeling and Simulation Numerical simulation of aerodynamic performance
More informationHigh fidelity gust simulations around a transonic airfoil
High fidelity gust simulations around a transonic airfoil AEROGUST Workshop 27 th - 28 th April 2017, University of Liverpool Presented by B. Tartinville (Numeca) Outline of the presentation 1Objectives
More informationNUMERICAL SIMULATION OF STATIC INTERFERENCE EFFECTS FOR SINGLE BUILDINGS GROUP
NUMERICAL SIMULATION OF STATIC INTERFERENCE EFFECTS FOR SINGLE BUILDINGS GROUP Xing-qian Peng, Chun-hui Zhang 2 and Chang-gui Qiao 2 Professor, College of Civil Engineering, Huaqiao University, Quanzhou,
More informationModular repetitive structures as countermeasure to galloping
Modular repetitive structures as countermeasure to galloping *Elena Dragomirescu ) and Yarzar Tun ) ), ) Department of Civil Engineering, University of Ottawa, Ottawa KN 6N5, Canada ) elndrag@uottawa.ca
More informationStudent name: + is valid for C =. The vorticity
13.012 Marine Hydrodynamics for Ocean Engineers Fall 2004 Quiz #1 Student name: This is a closed book examination. You are allowed 1 sheet of 8.5 x 11 paper with notes. For the problems in Section A, fill
More informationEFFECT OF CORNER CUTOFFS ON FLOW CHARACTERISTICS AROUND A SQUARE CYLINDER
EFFECT OF CORNER CUTOFFS ON FLOW CHARACTERISTICS AROUND A SQUARE CYLINDER Yoichi Yamagishi 1, Shigeo Kimura 1, Makoto Oki 2 and Chisa Hatayama 3 ABSTRACT It is known that for a square cylinder subjected
More informationCFD ANALYSIS OF FLOW AROUND AEROFOIL FOR DIFFERENT ANGLE OF ATTACKS
www.mechieprojects.com CFD ANALYSIS OF FLOW AROUND AEROFOIL FOR DIFFERENT ANGLE OF ATTACKS PRESENTATION OUTLINE AIM INTRODUCTION LITERATURE SURVEY CFD ANALYSIS OF AEROFOIL RESULTS CONCLUSIONS www.mechieprojects.com
More informationProceedings of the ASME th Biennial Conference on Engineering Systems Design and Analysis ESDA2014 June 25-27, 2014, Copenhagen, Denmark
Proceedings of the ASME 2014 12th Biennial Conference on Engineering Systems Design and Analysis ESDA2014 June 25-27, 2014, Copenhagen, Denmark ESDA2014-20042 UNSTEADY FLOW SIMULATION IN SUCTION MUFFLER
More informationAerodynamic study of a cyclist s moving legs using an innovative approach
Aerodynamic study of a cyclist s moving legs using an innovative approach Francesco Pozzetti 30 September 2017 Abstract During a period of four weeks in September, I completed a research project in fluid
More informationA NOVEL FLOATING OFFSHORE WIND TURBINE CONCEPT: NEW DEVELOPMENTS
A NOVEL FLOATING OFFSHORE WIND TURBINE CONCEPT: NEW DEVELOPMENTS L. Vita, U.S.Paulsen, T.F.Pedersen Risø-DTU Technical University of Denmark, Roskilde, Denmark luca.vita@risoe.dk Abstract: A novel concept
More informationApplication of pushover analysis in estimating seismic demands for large-span spatial structure
28 September 2 October 2009, Universidad Politecnica de Valencia, Spain Alberto DOMINGO and Carlos LAZARO (eds.) Application of pushover analysis in estimating seismic demands for large-span spatial structure
More informationWind Loading Code for Building Design in Thailand
Wind Loading Code for Building Design in Thailand Virote Boonyapinyo a, Panitan Lukkunaprasit b Pennung Warnitchai c and Phoonsak Pheinsusom d a Associate Professor, Department of Civil Engineering, Thammasat
More informationChapter 11 Waves. Waves transport energy without transporting matter. The intensity is the average power per unit area. It is measured in W/m 2.
Chapter 11 Waves Energy can be transported by particles or waves A wave is characterized as some sort of disturbance that travels away from a source. The key difference between particles and waves is a
More informationNumerical Analysis of Wind loads on Tapered Shape Tall Buildings
IJSTE - International Journal of Science Technology & Engineering Volume 1 Issue 11 May 2015 ISSN (online): 2349-784X Numerical Analysis of Wind loads on Tapered Shape Tall Buildings Ashwin G Hansora Assistant
More informationTwo-way Fluid Structure Interaction (FSI) Analysis on the Suction Valve Dynamics of a Hermetic Reciprocating Compressor
Volume 118 No. 18 2018, 4241-4252 ISSN: 1311-8080 (printed version); ISSN: 1314-3395 (on-line version) url: http://www.ijpam.eu ijpam.eu Two-way Fluid Structure Interaction (FSI) Analysis on the Suction
More informationUnsteady airfoil experiments
Unsteady airfoil experiments M.F. Platzer & K.D. Jones AeroHydro Research & Technology Associates, Pebble Beach, CA, USA. Abstract This paper describes experiments that elucidate the dynamic stall phenomenon
More informationCRITERIA OF BOW-DIVING PHENOMENA FOR PLANING CRAFT
531 CRITERIA OF BOW-DIVING PHENOMENA FOR PLANING CRAFT Toru KATAYAMA, Graduate School of Engineering, Osaka Prefecture University (Japan) Kentarou TAMURA, Universal Shipbuilding Corporation (Japan) Yoshiho
More informationComputational Analysis of Cavity Effect over Aircraft Wing
World Engineering & Applied Sciences Journal 8 (): 104-110, 017 ISSN 079-04 IDOSI Publications, 017 DOI: 10.589/idosi.weasj.017.104.110 Computational Analysis of Cavity Effect over Aircraft Wing 1 P. Booma
More informationFLOW CONSIDERATIONS IN INDUSTRIAL SILENCER DESIGN
FLOW CONSIDERATIONS IN INDUSTRIAL SILENCER DESIGN George Feng, Kinetics Noise Control, Inc., 3570 Nashua Drive, Mississauga, Ontario Vadim Akishin, Kinetics Noise Control, Inc., 3570 Nashua Drive, Mississauga,
More informationAIRFOIL PROFILE OPTIMIZATION OF AN AIR SUCTION EQUIPMENT WITH AN AIR DUCT
THERMAL SCIENCE, Year 2015, Vol. 19, No. 4, pp. 1217-1222 1217 AIRFOIL PROFILE OPTIMIZATION OF AN AIR SUCTION EQUIPMENT WITH AN AIR DUCT by Li QIU a,b, Rui WANG a,*, Xiao-Dong CHEN b, and De-Peng WANG
More informationVORTEX SHEDDING INDUCED VIBRATIONS OF A LIGHT MAST
BBAA VI International Colloquium on: Bluff Bodies Aerodynamics & Applications Milano, Italy, July, -4 8 VORTEX SHEDDING INDUCED VIBRATIONS OF A LIGHT MAST Bjarni Bessason, and Jónas Thór Snaæbjörnsson
More informationStability and Computational Flow Analysis on Boat Hull
Vol. 2, Issue. 5, Sept.-Oct. 2012 pp-2975-2980 ISSN: 2249-6645 Stability and Computational Flow Analysis on Boat Hull A. Srinivas 1, V. Chandra sekhar 2, Syed Altaf Hussain 3 *(PG student, School of Mechanical
More informationA.J.C. Crespo, J.M. Domínguez, C. Altomare, A. Barreiro, M. Gómez-Gesteira
A.J.C. Crespo, J.M. Domínguez, C. Altomare, A. Barreiro, M. Gómez-Gesteira OUTLINE Oscillating Water Column - What OWC is? - Numerical modelling of OWC SPH functionalities - Wave generation (1 st order
More informationWind Tunnel Study on Spanwise Correlation of Aerodynamic Forces on a 5:1 Rectangular Cylinder
The Eighth Asia-Pacific Conference on Wind Engineering, December 10 1, 2013, Chennai, India Wind Tunnel Study on Spanwise Correlation of Aerodynamic Forces on a 5:1 Rectangular Cylinder Xiaobing Liu 1,
More informationComputational Analysis of the S Airfoil Aerodynamic Performance
Computational Analysis of the 245-3S Airfoil Aerodynamic Performance Luis Velazquez-Araque and Jiří Nožička 2 Department of Mechanical Engineering National University of Táchira, San Cristóbal 5, Venezuela
More informationPRESSURE FLUCTUATIONS ACTING ON A TAPERED TALL BUILDING
The Seventh Asia-Pacific Conference on Wind Engineering, November 8-12, 29, Taipei, Taiwan PRESSURE FLUCTUATIONS ACTING ON A TAPERED TALL BUILDING Young-Moon Kim 1, Ki-Pyo You 1, Jang-Youl You 2 and Chang-Hyun
More informationWind pressure coefficient determination for greenhouses built in a reclaimed land using CFD technique
Ref: 1064 Wind pressure coefficient determination for greenhouses built in a reclaimed land using CFD technique Hyun-seob Hwang and In-bok Lee, Department of Rural Systems Engineering, Research Institute
More informationStanding Waves in a String
Standing Waves in a String OBJECTIVE To understand the circumstances necessary to produce a standing wave. To observe and define the quantities associated with a standing wave. To determine the wavelength
More informationA Numerical Simulation Comparing the Efficiencies of Tubercle Versus Straight Leading Edge Airfoils for a Darrieus Vertical Axis Wind Turbine
A Numerical Simulation Comparing the Efficiencies of Tubercle Versus Straight Leading Edge Airfoils for a Darrieus Vertical Axis Wind Turbine By: Ross Neal Abstract: The efficiencies of sinusoidal and
More informationSenior mechanical energy conversion trends
Senior mechanical energy conversion trends Introduction and Analysis to fan blade profile and CFD Simulation Of An Appropriate Blade Profile for improving energy efficiency HAMED ROSTAMALIZADEH 95742906
More informationA Numerical Simulation of Fluid-Structure Interaction for Refrigerator Compressors Suction and Exhaust System Performance Analysis
1131, Page 1 A Numerical Simulation of Fluid-Structure Interaction for Refrigerator Compressors Suction and Exhaust System Performance Analysis Shoufei Wu*, Zonghuai Wang Jiaxipera Compressor Co., Ltd.,
More informationDynamic response of composite caissonpiles
Dynamic response of composite caissonpiles foundations Maosong Huang Department of Geotechnical Engineering Tongji University, Shanghai, China Outline of talk 1 Introduction 2 Lateral response 3 Seismic
More informationMeasurement and simulation of the flow field around a triangular lattice meteorological mast
Measurement and simulation of the flow field around a triangular lattice meteorological mast Matthew Stickland 1, Thomas Scanlon 1, Sylvie Fabre 1, Andrew Oldroyd 2 and Detlef Kindler 3 1. Department of
More informationPOSTER PAPER PROCEEDINGS
ITA - AITES WORLD TUNNEL CONGRESS 21-26 April 2018 Dubai International Convention & Exhibition Centre, UAE POSTER PAPER PROCEEDINGS Study on the Piston Wind in the Tunnel Generated by a Train with Fire
More informationWelcome to Aerospace Engineering
Welcome to Aerospace Engineering DESIGN-CENTERED INTRODUCTION TO AEROSPACE ENGINEERING Notes 4 Topics 1. Course Organization 2. Today's Dreams in Various Speed Ranges 3. Designing a Flight Vehicle: Route
More informationCOMPARISONS OF COMPUTATIONAL FLUID DYNAMICS AND
The Seventh Asia-Pacific Conference on Wind Engineering, November 8-12, 2009, Taipei, Taiwan COMPARISONS OF COMPUTATIONAL FLUID DYNAMICS AND WIND TUNNEL EXPERIMENTS FOR PEDESTRIAN WIND ENVIRONMENTS Chin-Hsien
More informationExperimental and Theoretical Investigation for the Improvement of the Aerodynamic Characteristic of NACA 0012 airfoil
International Journal of Mining, Metallurgy & Mechanical Engineering (IJMMME) Volume 2, Issue 1 (214) ISSN 232 46 (Online) Experimental and Theoretical Investigation for the Improvement of the Aerodynamic
More informationThe Mechanism Study of Vortex Tools Drainage Gas Recovery of Gas Well
Advances in Petroleum Exploration and Development Vol. 7, No. 1, 214, pp. 62-66 DOI:1.3968/j.aped.1925543821471.1931 ISSN 1925-542X [Print] ISSN 1925-5438 [Online] www.cscanada.net www.cscanada.org The
More informationInvestigation of the flow around uncambered airfoils at 1000 Reynolds number using computational fluid dynamics for micro air vehicles
Investigation of the flow around uncambered airfoils at 1000 Reynolds number using computational fluid dynamics for micro air vehicles Emad Uddin 1), Muhammad Adil Naseem 2), Saif Ullah Khalid 3), Aamir
More informationCoupling and Analysis of 981 Deep Water Semi-submersible. Drilling Platform and the Mooring System
4th International Conference on Renewable Energy and Environmental Technology (ICREET 2016) Coupling and Analysis of 981 Deep Water Semi-submersible Drilling Platform and the Mooring System XuDong Wang1,
More informationWIND-INDUCED LOADS OVER DOUBLE CANTILEVER BRIDGES UNDER CONSTRUCTION
WIND-INDUCED LOADS OVER DOUBLE CANTILEVER BRIDGES UNDER CONSTRUCTION S. Pindado, J. Meseguer, J. M. Perales, A. Sanz-Andres and A. Martinez Key words: Wind loads, bridge construction, yawing moment. Abstract.
More informationAerodynamic Performance of 160km Box Car
Aerodynamic Performance of 16km Box Car *Tianyun Dong 1) and Xifeng Liang 2) 1), 2) Key Laboratory of Traffic Safety on Track of Ministry of Education, School of Traffic & Transportation Engineering, Central
More information3D CDF MODELING OF SHIP S HEELING MOMENT DUE TO LIQUID SLOSHING IN TANKS A CASE STUDY
Journal of KONES Powertrain and Transport, Vol. 17, No. 4 21 3D CDF ODELING OF SHIP S HEELING OENT DUE TO LIQUID SLOSHING IN TANKS A CASE STUDY Przemysaw Krata, Jacek Jachowski Gdynia aritime University,
More informationEffect of Diameter on the Aerodynamics of Sepaktakraw Balls, A Computational Study
ISSN 1750-9823 (print) International Journal of Sports Science and Engineering Vol. 03 (2009) No. 01, pp. 017-021 Effect of Diameter on the Aerodynamics of Sepaktakraw Balls, A Computational Study Zahari
More informationINVESTIGATION OF PRESSURE CONTOURS AND VELOCITY VECTORS OF NACA 0015IN COMPARISON WITH OPTIMIZED NACA 0015 USING GURNEY FLAP
INVESTIGATION OF PRESSURE CONTOURS AND VELOCITY VECTORS OF NACA 0015IN COMPARISON WITH OPTIMIZED NACA 0015 USING GURNEY FLAP 1 ANANTH S SHARMA, 2 SUDHAKAR S, 3 SWATHIJAYAKUMAR, 4 B S ANIL KUMAR 1,2,3,4
More informationOPTIMIZATION OF SINGLE STAGE AXIAL FLOW COMPRESSOR FOR DIFFERENT ROTATIONAL SPEED USING CFD
http:// OPTIMIZATION OF SINGLE STAGE AXIAL FLOW COMPRESSOR FOR DIFFERENT ROTATIONAL SPEED USING CFD Anand Kumar S malipatil 1, Anantharaja M.H 2 1,2 Department of Thermal Power Engineering, VTU-RO Gulbarga,
More informationAbstract. 1 Introduction
A computational method for calculatingthe instantaneous restoring coefficients for a ship moving in waves N. El-Simillawy College of Engineering and Technology, Arab Academyfor Science and Technology,
More informationAustralian Journal of Basic and Applied Sciences. Pressure Distribution of Fluid Flow through Triangular and Square Cylinders
AENSI Journals Australian Journal of Basic and Applied Sciences ISSN:1991-8178 Journal home page: www.ajbasweb.com Pressure Distribution of Fluid Flow through Triangular and Square Cylinders 1 Nasaruddin
More informationHigh Swept-back Delta Wing Flow
Advanced Materials Research Submitted: 2014-06-25 ISSN: 1662-8985, Vol. 1016, pp 377-382 Accepted: 2014-06-25 doi:10.4028/www.scientific.net/amr.1016.377 Online: 2014-08-28 2014 Trans Tech Publications,
More informationEffect of a rigid wall on the vortex induced vibration of two staggered circular cylinders
Effect of a rigid wall on the vortex induced vibration of two staggered circular cylinders Javad Farrokhi Derakhshandeh a), Maziar Arjomandi, Benjamin S. Cazzolato and Bassam Dally Abstract School of Mechanical
More informationComputationally Efficient Determination of Long Term Extreme Out-of-Plane Loads for Offshore Turbines
Computationally Efficient Determination of Long Term Extreme Out-of-Plane Loads for Offshore Turbines Anand Natarajan Senior Scientist Wind Energy Department, Risø DTU Denmark Introduction IEC 61400-1
More informationAn Experimental Study of Vortex Shedding Behind a Bluff Body in a Water Channel
An Experimental Study of Vortex Shedding Behind a Bluff Body in a Water Channel ¹Meghanadhan C A, ² Sunil A S ¹PG Scholar, ² Associate Prof. Govt Engineering College Thrissur, Kerala,India Abstract-When
More informationAvailable online at ScienceDirect. Procedia Engineering 126 (2015 )
Available online at www.sciencedirect.com ScienceDirect Procedia Engineering 126 (2015 ) 431 435 7th International Conference on Fluid Mechanics, ICFM7 Self-propulsion of a flexible plunging foil near
More informationNumerical Simulation of the Basketball Flight Trajectory based on FLUENT Fluid Solid Coupling Mechanics Yanhong Pan
Applied Mechanics and Materials Submitted: 2014-08-05 ISSN: 1662-7482, Vols. 651-653, pp 2347-2351 Accepted: 2014-08-06 doi:10.4028/www.scientific.net/amm.651-653.2347 Online: 2014-09-30 2014 Trans Tech
More informationDesign & Analysis of Natural Laminar Flow Supercritical Aerofoil for Increasing L/D Ratio Using Gurney Flap
Design & Analysis of Natural Laminar Flow Supercritical Aerofoil for Increasing L/D Ratio Using Gurney Flap U.Praveenkumar 1, E.T.Chullai 2 M.Tech Student, School of Aeronautical Science, Hindustan University,
More informationExperimental Investigation Of Flow Past A Rough Surfaced Cylinder
(AET- 29th March 214) RESEARCH ARTICLE OPEN ACCESS Experimental Investigation Of Flow Past A Rough Surfaced Cylinder Monalisa Mallick 1, A. Kumar 2 1 (Department of Civil Engineering, National Institute
More informationWaves. harmonic wave wave equation one dimensional wave equation principle of wave fronts plane waves law of reflection
Waves Vocabulary mechanical wave pulse continuous periodic wave amplitude wavelength period frequency wave velocity phase transverse wave longitudinal wave intensity displacement wave number phase velocity
More informationNumerical Investigation of Multi Airfoil Effect on Performance Increase of Wind Turbine
International Journal of Engineering & Applied Sciences (IJEAS) International Journal of Engineering Applied Sciences (IJEAS) Vol.9, Issue 3 (2017) 75-86 Vol.x, Issue x(201x)x-xx http://dx.doi.org/10.24107/ijeas.332075
More informationModal Analysis of Propulsion Shafting of a 48,000 tons Bulk Carrier
Modal Analysis of Propulsion Shafting of a 48,000 tons Bulk Carrier Zixin Wang a Dalian Scientific Test and Control Technology Institute. 16 Binhai Street. Dalian, 116013, China. Abstract a wangzixin_1@163.com
More informationAerodynamics and Vortex Structures of a Flapping Airfoil in Forward Flight in Proximity of Ground
Washington University in St. Louis Washington University Open Scholarship Engineering and Applied Science Theses & Dissertations Engineering and Applied Science Spring 5-19-2017 Aerodynamics and Vortex
More informationTHE BRIDGE COLLAPSED IN NOVEMBER 1940 AFTER 4 MONTHS OF ITS OPENING TO TRAFFIC!
OUTLINE TACOMA NARROWS BRIDGE FLOW REGIME PAST A CYLINDER VORTEX SHEDDING MODES OF VORTEX SHEDDING PARALLEL & OBLIQUE FLOW PAST A SPHERE AND A CUBE SUMMARY TACOMA NARROWS BRIDGE, USA THE BRIDGE COLLAPSED
More information