An Overview of Wind Engineering Where Climate Meets Design
|
|
- Baldwin Armstrong
- 5 years ago
- Views:
Transcription
1 An Overview of Wind Engineering Where Climate Meets Design Presented by Derek Kelly, M.Eng., P.Eng. Principal/Project Manager
2 RWDI Leadership & Consulting Expertise RWDI Consulting Engineers & Scientists offering design guidance and problem solving for structural and environmental issues Established in employees Multi-disciplinary teams Senior scientists; engineers; specialists; meteorologists; engineering technologists; technicians; support staff
3 Allied offices around the world
4 Overview Overall building aerodynamics Building motion and supplementary damping Snow drifting and loading
5 Instantaneous Pressure Distribution About a Building
6 Experimental Process
7 Planetary boundary layer and effect of surface roughness - mean velocity profile
8
9 Local wind climate assessment and distribution of wind speeds Mean hourly wind speed (mph) \ bridge alignment included year Bridge P e rc e n ta g e o f Ti m e Return Period (years) 100-year Winds Exceeding 90 mph Wind Direction (degrees) year
10 Why we need shape optimization? Across-wind response where mean loads are negligible Mx 4.0E+ 09 Base Overturning Moment B a s e O v e rt u r n in g M o m e n t ( N -m ) 2.0E E E E+ 09 Along-wind response Wind Direction (degrees) Wind Direction (degrees) Peak Maximum Mean Peak Minimum For a slender tall building with almost uniform cross-section, the wind loads can be governed by across-wind response due to vortex shedding. This normally becomes an issue for both strength design and serviceability.
11 Why we need shape optimization? Across-wind response where mean loads are negligible Mx 4.0E+ 09 Base Overturning Moment B a s e O v e rt u r n in g M o m e n t ( N -m ) 2.0E E E E+ 09 Along-wind response Wind Direction (degrees) Wind Direction (degrees) Peak Maximum Mean Peak Minimum Wind response can be significantly reduced by shape optimization.
12 Across Wind Response and Vortex Shedding Strouhal Number f S U t D S t = Strouhal number D = a characteristic dimension, taken as the width U = the velocity of the approaching wind Strouhal numbers have been determined for a variety of shapes such as rectangular, circular and triangular bodies. Typically between 0.12 to 0.16 for squared objects, and 0.2 to 0.22 for circular bodies. U crit f B S D t 12
13 Mitigating Cross-Wind Response 432 Park Avenue
14 Mitigating Cross-Wind Response Taipei 101 Original Corner options tested Modified 25% - 30% REDUCTION IN BASE MOMENT
15 Tapered Box 120 o Configuration 180 o Configuration 100 o Configuration 110 o Configuration 15 Final 15 Configuration
16 Benefits of Optimization due to Twist & Building Orientation Comparison of Base Overturning Moments Assume the same structural properties for all configurations (Vr=52m/s, 100-yr wind, damping=2.0%) Reference Configuration Test Date My (N-m) Ratio Mx (N-m) Ratio Ref. Ratio Resultant Base (Tapered Box) 08/22/ E % 4.98E % 6.22E % 100 o (107 o ) 07/28/ E+10 83% 4.19E+10 84% 5.18E+10 83% 110 o (118 o ) 08/22/ E+10 73% 4.31E+10 87% 4.92E+10 79% 180 o (193 o ) 07/28/ E+10 62% 3.65E+10 73% 4.18E+10 67% 120 o (129 o ) - 0 Rot. Estimated 3.43E+10 63% 4.29E+10 86% 4.75E+10 76% 110 o (118 o ) - 30 Rot. 09/29/ E+10 72% 3.60E+10 72% 4.48E+10 72% 120 o - 40 Rot. 09/29/ E+10 66% 3.53E+10 71% 4.15E+10 67% Ref.Resultant 0 Rot. Original 110 Shape Footprint Position 30 Rot. Optimal Orientation of 110 Shape 40 Rot. Optimal Orientation of 120 Shape ( Max) ( 0. 6 Min) 2 2
17 Controlling Motions
18 Taipei 101
19 Comcast Tower - Philadelphia
20 432 Park Avenue in action!
21 Specialty Studies
22 Aeroelastic of a Super Tall Building
23 Aeroelastic model of a construction stage Image of a Rigid Aeroelastic Model Under Construction
24 Aeroelastic Models of Completed Bridges Tacoma Narrows Bridges Tacoma, Washington (suspension bridges) Cooper River Bridge - Charleston, S.C. (cable-stayed bridge)
25 Aeroelastic scaling
26 Non-dimensional time = Time and velocity scaling Non-dimensional velocity = t * U tu * b ref U ref b 0
27 Reynolds Number Tests In fluid mechanics, the Reynolds number is a measure of the ratio of inertial forces to viscous forces, and quantifies the relative importance of these two types of forces for given flow conditions. It is primarily used to identify different flow regimes passing by a given object. Typically, Reynolds number is defined as follows: VD Re where: V - mean fluid velocity, [m/s] D - diameter of pipe, [m] ν - kinematic fluid viscosity, [m 2 /s] Often overlooked in bluff body aerodynamics for sharp edged objects Typical ranges at model scale Re values are 10 4 Typical ranges at full scale Re values are 10 7
28 Plot of Drag Coefficient of a Cylinder vs. Reynolds Number 4.0 Drag coefficient u b Drag Force 1 u A C D 2 2 A b E+01 1E+02 1E+03 1E+04 1E+05 1E+06 1E+07 Reynolds number [After Clift, Grace and Weber Bubbles, Drops and Particles, Academic Press, 1978]
29 Addressing Reynolds Number Because the Reynolds number is a function of Speed, Width of the object, and viscosity, one can do the following to achieve a high Reynolds number: Test a large model Test at a high speed Change the air density in the experiment* *difficult to do, need a pressurized wind tunnel For projects that RWDI has worked, a large model has been built and tested at a high speed. These experiments are then compared to a similar experiment conducted at a smaller scale in RWDI s facilities. The results from each are then compared to original wind tunnel tests. The outcome is typically the overall responses, i.e. overall loads on a tower and building accelerations reduce, whereas the local Cladding loads may increase slightly and the distribution will change.
30 High Reynolds Number Tests (option) Example
31 High Reynolds Number Tests
32 High Reynolds Number Tests Shanghai Center
33 Shear Force (lbf) Fx 1.80E E E E E E E E E E E Wind Direction (degrees) Full Stage Equipment - Full Roof No Stage Equipment - Full Roof Shear Force (lbf) 5.00E+03 Fy 0.00E E E E E E E Wind Direction (degrees) Full Stage Equipment - Half Roof No Stage Equipment - Half Roof
34 Indiana State Fair Collapse Incident Wind Engineering Services Scale Model Tests
35 Shear Force (lbf) Fx 1.80E E E E E E E E E E E Wind Direction (degrees) Full Stage Equipment - Full Roof No Stage Equipment - Full Roof Shear Force (lbf) 5.00E+03 Fy 0.00E E E E E E E Wind Direction (degrees) Full Stage Equipment - Half Roof No Stage Equipment - Half Roof
36 SNOW CONTROL FEATURES IN BUILDING DESIGN
37 Understanding the Local Climate All Winter Winds Winds during Snowfall Percentage of Snow over All Winds: 12.9% Wind Speed km/h Winter Winds Probability (%) During Snowfall Blowing Snow > Blowing Snow Events Winter Winds Directionality (Blowing From) Toronto International Airport ( )
38 Site surroundings and topography also something we also have little control over
39 Drifting Snow in Urban Areas
40 Unbalanced Structural Snow Load Approaching Wind Flow Large Problematic Grade Level Drift Roof Step Accumulation Example Snow Drift Simulation
41 Reduced Accumulations Large Structural Loads Evaluation of Mitigation Measures
42 Snow Drifts Pushed Away from the Building Facade Wind Deflector Device Evaluation of Mitigation Measures
43 Wind Deflectors above Clearstory Windows
44 Building Massing to Promote Controlled Sliding Image Courtesy
45 Large Catchment Gutter for Storing Sliding Snow Sliding Snow and Ice Snow Deflector for Directing Snow into Large Catchment Gutter Building Massing to Promote Controlled Sliding Image Courtesy
46 Scale Model of Minnesota Multi-Purpose Stadium in RWDI s Boundary Layer Wind Tunnel
47 Reputation Resources Results Canada USA UK India China Velocity Vectors from Wind Tunnel Tests RWDI s FAE (Finite Area Element) study was used to derive detailed snow loading patterns on the roof for 58 years of historical winter weather data The study accounted for: snow and rainfall on the roof the velocity field (drifting) across the roof thermal effects or heat loss sliding Page 47 Example of Flow Fields Obtained from Wind Tunnel Testing
48 Reputation Resources Results Canada USA UK India China Example of Roof Loading Pattern Example Time History of Ground Accumulation for the Winter of Example Time History of Minnesota Multi-Purpose Stadium Roof Loading for the Winter of Example of Typical Roof Snow Accumulation for the Winter of Page 48
49 Through knowledge and understanding, we can anticipate and control the impact of the climate in the built environment. Performance and precision.
50 MERCI BEAUCOUP
RESILIENT INFRASTRUCTURE June 1 4, 2016
RESILIENT INFRASTRUCTURE June 1 4, 2016 CASE STUDIES ON THE IMPACT OF SURROUNDING BUILDINGS ON WIND-INDUCED RESPONSE John Kilpatrick Rowan Williams Davies and Irwin, Guelph, Ontario, Canada ABSTRACT In
More informationQuantification 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 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 informationEXPERIMENTAL STUDY OF WIND PRESSURES ON IRREGULAR- PLAN SHAPE BUILDINGS
BBAA VI International Colloquium on: Bluff Bodies Aerodynamics & Applications Milano, Italy, July, 2-24 8 EXPERIMENTAL STUDY OF WIND PRESSURES ON IRREGULAR- PLAN SHAPE BUILDINGS J. A. Amin and A. K. Ahuja
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 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 informationLehigh-FIU Hybrid Wind Simulation Developments
Lehigh-FIU Hybrid Wind Simulation Developments 2018 NSF Lehigh-FIU NHERI Experimental Facilities User Workshop December 3 rd, 2018 Amal Elawady, PhD Assistant Professor Department of Civil and Environmental
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 informationEffects of wind incidence angle on wind pressure distribution on square plan tall buildings
J. Acad. Indus. Res. Vol. 1(12) May 2013 747 RESEARCH ARTICLE ISSN: 2278-5213 Effects of wind incidence angle on wind pressure distribution on square plan tall buildings S.K. Verma 1, A.K. Ahuja 2* and
More information2013 Wall of Wind (WoW) Contest Informational Workshop
2013 Wall of Wind (WoW) Contest Informational Workshop Presented By: Ioannis Zisis February 22, 2013 With Contributions By: Dr. Girma Bitsuamlak, Roy Liu, Walter Conklin, Dr. Arindam Chowdhury, Jimmy Erwin,
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 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 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 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 informationOTC Copyright 2003, Offshore Technology Conference
OTC 54 Model Test Experience on Vortex Induced Vibrations of Truss Spars Radboud van Dijk, Maritime Research Institute Netherlands, Allan Magee, Technip Offshore, Inc., Steve Perryman, BP Americas, Inc.,
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 informationUNIVERSITY OF HONG KONG LIBRARY. Hong Kong Collection
UNIVERSITY OF HONG KONG LIBRARY Hong Kong Collection CODE OF PRACTICE ON WIND EFFECTS HONG KONG-1983 BUILDING DEVELOPMENT DEPARTMENT HONG KONG PRINTED AND PUBLISHED BY THE GOVERNMENT PRINTER, HONG KONG
More informationThe Effect of Von Karman Vortex Street on Building Ventilation
The Effect of Von Karman Vortex Street on Building Ventilation P.Praveen Kumar Abstract This paper deals with the utilisation of the von Karman vortex street principle to maximise air flow into buildings.
More informationEXPERIMENTAL INVESTIGATION OF WAKE SURVEY OVER A CYLINDER WITH DIFFERENT SURFACE PROFILES
EXPERIMENTAL INVESTIGATION OF WAKE SURVEY OVER A CYLINDER WITH DIFFERENT SURFACE PROFILES Abdul Ahad Khan 1, Abhishek M. B 2, Tresa Harsha P George 3 1 Under Graduate student, Department of Aeronautical
More informationAerodynamic Analysis of Blended Winglet for Low Speed Aircraft
, July 1-3, 2015, London, U.K. Aerodynamic Analysis of Blended Winglet for Low Speed Aircraft Pooja Pragati, Sudarsan Baskar Abstract This paper provides a practical design of a new concept of massive
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 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 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 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 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 informationJournal of Engineering Science and Technology Review 6 (3) (2013) Research Article
Jestr Journal of Engineering Science and Technology Review 6 (3) (013) 105-110 Research Article JOURNAL OF Engineering Science and Technology Review www.jestr.org Lift and Drag on Cylinder of Octagonal
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 informationBasis of Structural Design
Basis of Structural Design Course 10 Actions on structures: Wind loads Other loads Course notes are available for download at http://www.ct.upt.ro/users/aurelstratan/ Wind loading: normative references
More informationTechniques to achieve wind comfort & wind loads on buildings and appurtenances
Vipac Engineers & Scientists Techniques to achieve wind comfort & wind loads on buildings and appurtenances including shades, verandahs, hoardings and walls. Mr Ian Jones, Managing Director Dr Seifu Bekele,
More informationROAD MAP... D-1: Aerodynamics of 3-D Wings D-2: Boundary Layer and Viscous Effects D-3: XFLR (Aerodynamics Analysis Tool)
Unit D-1: Aerodynamics of 3-D Wings Page 1 of 5 AE301 Aerodynamics I UNIT D: Applied Aerodynamics ROAD MAP... D-1: Aerodynamics of 3-D Wings D-: Boundary Layer and Viscous Effects D-3: XFLR (Aerodynamics
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 informationExperimental investigation on the influence of wind direction on the aerodynamic loads acting on low aspect-ratio triangular prisms
Experimental investigation on the influence of wind direction on the aerodynamic loads acting on low aspect-ratio triangular prisms Giacomo Valerio Iungo and Guido Buresti Department of Aerospace Engineering,
More informationWind Pressure Distribution on Rectangular Plan Buildings with Multiple Domes
Wind Pressure Distribution on Rectangular Plan Buildings with Multiple Domes Astha Verma, Ashok K. Ahuja Abstract Present paper describes detailed information of the experimental study carried out on the
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 information1700 Webster Street Oakland, CA. Final Report. Pedestrian Wind Conditions Consultation Wind Tunnel Tests RWDI # July 16, 2015
Tel: 519.823.1311 Fax: 519.823.1316 Rowan Williams Davies & Irwin Inc. 650 Woodlawn Road West Guelph, Ontario, Canada N1K 1B8 1700 Webster Street Oakland, CA Final Report Pedestrian Wind Conditions Consultation
More informationSurrounding buildings and wind pressure distribution on a high rise building
Surrounding buildings and wind pressure distribution on a high rise building Conference or Workshop Item Accepted Version Luo, Z. (2008) Surrounding buildings and wind pressure distribution on a high rise
More informationCOMPUTATIONAL FLUID DYNAMICS (CFD) INVESTIGATION TO ASSESS WIND EFFECTS ON A TALL STRUCTURES (WIND FORCE PARAMETERS)
COMPUTATIONAL FLUID DYNAMICS (CFD) INVESTIGATION TO ASSESS WIND EFFECTS ON A TALL STRUCTURES (WIND FORCE PARAMETERS) G Naga Sulochana 1, H Sarath kumar 2 1M.Tech Student. 2 Assistant Professor 1,2Department
More informationAvailable online at ScienceDirect. Procedia Engineering 161 (2016 )
Available online at www.sciencedirect.com ScienceDirect Procedia Engineering 161 (216 ) 1845 1851 World Multidisciplinary Civil Engineering-Architecture-Urban Planning Symposium 216, WMCAUS 216 Experimental
More informationTHREE DIMENSIONAL STRUCTURES OF FLOW BEHIND A
The Seventh Asia-Pacific Conference on Wind Engineering, November 8-12, 29, Taipei, Taiwan THREE DIMENSIONAL STRUCTURES OF FLOW BEHIND A SQUARE PRISM Hiromasa Kawai 1, Yasuo Okuda 2 and Masamiki Ohashi
More informationA Study on the Effects of Wind on the Drift Loss of a Cooling Tower
A Study on the Effects of Wind on the Drift Loss of a Cooling Tower Wanchai Asvapoositkul 1* 1 Department of Mechanical Engineering, Faculty of Engineering, King Mongkut s University of Technology Thonburi
More informationDear Ms. Maw: Qualitative Pedestrian Level Wind Assessment St-Charles Market, 135 Barrette Street, Ottawa GWE File No.
December 11, 2015 Jenna Maw LineBox Studio Inc. 126 York Street, Suite 502 Ottawa, Ontario K1N 5T2 Dear Ms. Maw: Re: Qualitative Pedestrian Level Wind Assessment St-Charles Market, 135 Barrette Street,
More informationEffects of directionality on wind load and response predictions
Effects of directionality on wind load and response predictions Seifu A. Bekele 1), John D. Holmes 2) 1) Global Wind Technology Services, 205B, 434 St Kilda Road, Melbourne, Victoria 3004, Australia, seifu@gwts.com.au
More informationThe effect of back spin on a table tennis ball moving in a viscous fluid.
How can planes fly? The phenomenon of lift can be produced in an ideal (non-viscous) fluid by the addition of a free vortex (circulation) around a cylinder in a rectilinear flow stream. This is known as
More informationInvestigations on the Aerodynamic Forces of 2-D Square Lattice Tower Section Using CFD
J. Energy Power Sources Vol. 1, No. 5, 2014, pp. 270-277 Received: August 14, 2014, Published: November 30, 2014 Journal of Energy and Power Sources www.ethanpublishing.com Investigations on the Aerodynamic
More information2-D Computational Analysis of a Vertical Axis Wind Turbine Airfoil
2-D Computational Analysis of a Vertical Axis Wind Turbine Airfoil Akshay Basavaraj1 Student, Department of Aerospace Engineering, Amrita School of Engineering, Coimbatore 641 112, India1 Abstract: This
More informationWind-Induced Oscillations Parametric Wind Tunnel Test
National Aeronautics and Space Administration Wind-Induced Oscillations Parametric Wind Tunnel Test Sam Yunis, Donald Keller, Thomas Ivanco, Jennifer Pinkerton NASA Langley Presented at Spacecraft and
More informationA Wind-Tunnel Study of a Cubic Rooftop AC Unit on a Low Building
A Wind-Tunnel Study of a Cubic Rooftop AC Unit on a Low Building Noriaki Hosoya, 1 Jack E. Cermak, 2 and Chris Steele 3 Abstract A wind-tunnel test was conducted to determine gust wind loads on simple
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 informationAvailable online at Procedia Engineering 200 (2010) (2009)
Available online at www.sciencedirect.com Procedia Engineering 200 (2010) (2009) 000 000 2487 2492 Procedia Engineering www.elsevier.com/locate/procedia 8 th Conference of the International Sports Engineering
More informationleading edge, where the flow is fully separated. Both for the means and peaks, smooth flow leads to the highest values. A good correlation between cav
The Seventh International Colloquium on Bluff Body Aerodynamics and Applications (BBAA7) Shanghai, China; September 2-6, 22 Towards a better understanding of pressure equalization Carine van Bentum a,
More informationFlow Over Bodies: Drag and Lift
Fluid Mechanics (0905241) Flow Over Bodies: Drag and Lift Dr.-Eng. Zayed dal-hamamre 1 Content Overview Drag and Lift Flow Past Objects Boundary Layers Laminar Boundary Layers Transitional and Turbulent
More informationnamic behavior of the structures using different geometry of the porosity or replacing with notporous surfaces. This analysis is very interesting as t
The Seventh International Colloquium on Bluff Body Aerodynamics and Applications (BBAA7) Shanghai, China; September 2-6, 212 Wind tunnel studies on the effects of porous elements on the aerodynamic behavior
More informationShip Resistance and Propulsion Prof. Dr. P. Krishnankutty Ocean Department Indian Institute of Technology, Madras
Ship Resistance and Propulsion Prof. Dr. P. Krishnankutty Ocean Department Indian Institute of Technology, Madras Lecture - 7 Air and Wind Resistance Dimensional Analysis I Coming back to the class, we
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 informationEXPERIMENTAL ANALYSIS OF THE CONFLUENT BOUNDARY LAYER BETWEEN A FLAP AND A MAIN ELEMENT WITH SAW-TOOTHED TRAILING EDGE
24 TH INTERNATIONAL CONGRESS OF THE AERONAUTICAL SCIENCES EXPERIMENTAL ANALYSIS OF THE CONFLUENT BOUNDARY LAYER BETWEEN A FLAP AND A MAIN ELEMENT WITH SAW-TOOTHED TRAILING EDGE Lemes, Rodrigo Cristian,
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 informationComputation of Flow Behind Three Side-by-Side Cylinders of Unequal/Equal Spacing
Computation of Flow Behind Three Side-by-Side Cylinders of Unequal/Equal Spacing H. K. Virahsawmy 1, L. Chen 2, I. R. MacGillivray 2, J. Tu 1 and Y. Zhou 3 1. School of Aerospace, Mechanical and Manufacturing
More informationand its weight (in newtons) when located on a planet with an acceleration of gravity equal to 4.0 ft/s 2.
1.26. A certain object weighs 300 N at the earth's surface. Determine the mass of the object (in kilograms) and its weight (in newtons) when located on a planet with an acceleration of gravity equal to
More informationComparison on Wind Load Prediction of Transmission Line between Chinese New Code and Other Standards
Available online at www.sciencedirect.com Procedia Engineering 14 (011) 1799 1806 The Twelfth East Asia-Pacific Conference on Structural Engineering and Construction Comparison on Wind Load Prediction
More informationResearch Article Influence of Turbulence, Orientation, and Site Configuration on the Response of Buildings to Extreme Wind
e Scientific World Journal, Article D 178465, 15 pages http://dx.doi.org/1.1155/214/178465 Research Article nfluence of Turbulence, Orientation, and Site Configuration on the Response of Buildings to Extreme
More information6. EXPERIMENTAL METHOD. A primary result of the current research effort is the design of an experimental
6. EXPERIMENTAL METHOD 6.1 Introduction A primary result of the current research effort is the design of an experimental setup that can simulate the interaction of a windmill with a vortex wake and record
More informationExternal Pressure Coefficients on Saw-tooth and Mono-sloped Roofs
External Pressure Coefficients on Saw-tooth and Mono-sloped Roofs Authors: Bo Cui, Ph.D. Candidate, Clemson University, 109 Lowry Hall, Clemson, SC 9634-0911, boc@clemson.edu David O. Prevatt, Assistant
More informationSTUDIES ON THE OPTIMUM PERFORMANCE OF TAPERED VORTEX FLAPS
ICAS 2000 CONGRESS STUDIES ON THE OPTIMUM PERFORMANCE OF TAPERED VORTEX FLAPS Kenichi RINOIE Department of Aeronautics and Astronautics, University of Tokyo, Tokyo, 113-8656, JAPAN Keywords: vortex flap,
More informationFLUID FORCE ACTING ON A CYLINDRICAL PIER STANDING IN A SCOUR
BBAA VI International Colloquium on: Bluff Bodies Aerodynamics & Applications Milano, Italy, July, 20-24 2008 FLUID FORCE ACTING ON A CYLINDRICAL PIER STANDING IN A SCOUR Takayuki Tsutsui Department of
More informationDownscaling in fluid mechanics SIMULATING CLIMATE IN WIND TUNNEL : WHY DO IT AT FULL SCALE?
Emplacement réservé pour une photo Centre Scientifique et Technique du Bâtiment SIMULATING CLIMATE IN WIND TUNNEL : WHY DO IT AT FULL SCALE? Olivier FLAMAND (CSTB, France) MARCH 16th 2015 Third UN conférence
More informationINTERACTION BETWEEN WIND-DRIVEN AND BUOYANCY-DRIVEN NATURAL VENTILATION Bo Wang, Foster and Partners, London, UK
INTERACTION BETWEEN WIND-DRIVEN AND BUOYANCY-DRIVEN NATURAL VENTILATION Bo Wang, Foster and Partners, London, UK ABSTRACT Ventilation stacks are becoming increasingly common in the design of naturally
More informationRESILIENT INFRASTRUCTURE June 1 4, 2016
RESILIENT INFRASTRUCTURE June 4, 26 EFFECT OF WIND SPEED AND TERRAIN EXPOSURE ON THE WIND PRESSURES FOR ELEVATED STEEL CONICAL TANKS Ahmed Musa Ph.D Candidate, Western University, Canada Haitham Aboshosha
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 informationA numerical Euler-Lagrange method for bubble tower CO2 dissolution modeling
A numerical Euler-Lagrange method for bubble tower CO2 dissolution modeling Author: Daniel Legendre & Prof. Ron Zevenhoven Åbo Akademi University Thermal and Flow Engineering Laboratory Turku, Finland
More informationEXPERIMENTAL STUDY ON SNOW BEHAVIOR AROUND FENCES INSTALLED ALONG ELEVATED HIGHWAY
ISTP-16, 25, PRAGUE 16 TH INTERNATIONAL SYMPOSIUM ON TRANSPORT PHENOMENA EXPERIMENTAL STUDY ON SNOW BEHAVIOR AROUND FENCES INSTALLED ALONG ELEVATED HIGHWAY Akinori Nakata*, Haruo Soeda*, Junji Onishi*,
More informationAerodynamic Analysis of a Symmetric Aerofoil
214 IJEDR Volume 2, Issue 4 ISSN: 2321-9939 Aerodynamic Analysis of a Symmetric Aerofoil Narayan U Rathod Department of Mechanical Engineering, BMS college of Engineering, Bangalore, India Abstract - The
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 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 informationAvai 193 Fall 2016 Laboratory Greensheet
Avai 193 Fall 2016 Laboratory Greensheet Lab Report 1 Title: Instrumentation Test Technique Research Process: Break into groups of 4 people. These groups will be the same for all of the experiments performed
More informationAlong and Across Wind Loads Acting on Tall Buildings
Along and Across Wind Loads Acting on Tall Buildings Aiswaria G. R* and Dr Jisha S. V** *M Tech student, Structural Engineering, Mar Baselios College of Engineering and Technology, Kerala aiswariagr@gmail.com
More informationAerodynamic Design, Fabrication and Testing of Wind Turbine Rotor Blades
Aerodynamic Design, Fabrication and Testing of Wind Turbine Rotor Blades T.Mahendrapandian Department of Mechanical Engineering P.G. Student, Regional Centre of Anna University, Tirunelveli, Tamilnadu,
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 informationEXPERIMENTAL RESEARCH ON THE MECHANICAL SOLICITATIONS OF THE GREENHOUSES OF VEGETABLES AND FLOWERS LOCATED ON ROOFTOPS
6 th International Conference Computational Mechanics and Virtual Engineering COMEC 2015 15-16 October 2015, Braşov, Romania EXPERIMENTAL RESEARCH ON THE MECHANICAL SOLICITATIONS OF THE GREENHOUSES OF
More informationIntegrating Wind Energy into the Design of Tall Buildings A Case Study of the Houston Discovery Tower WINDPOWER 2008
Integrating Wind Energy into the Design of Tall Buildings A Case Study of the Houston Discovery Tower WINDPOWER 2008 Brad C. Cochran, MS Rick R. Damiani, PhD, P.E. (Europe) CPP, Inc. 1415 Blue Spruce Drive
More information130 William Street New York, NY, USA
12119293 ES29249846 DEPT OF BLDGS Job Number Scan Code COMMERCIAL - IN - CONFIDENCE 13 William Street New York, NY, USA Wind Tunnel Testing Overall Wind Loading Study December 21 st 216 For The Lightstone
More informationSubsonic Wind Tunnel 300 mm
aerodynamics AF1300 An open circuit suction subsonic wind tunnel with a working section of 300 mm by 300 mm and 600 mm long Screenshot of the optional VDAS software Saves time and money compared to full-scale
More informationAF100. Subsonic Wind Tunnel AERODYNAMICS. Open-circuit subsonic wind tunnel for a wide range of investigations into aerodynamics
Open-circuit subsonic wind tunnel for a wide range of investigations into aerodynamics Page 1 of 4 Works with Computer, chair and work table shown for photographic purposes only (not included) Screenshot
More informationComputational studies on small wind turbine performance characteristics
Journal of Physics: Conference Series PAPER OPEN ACCESS Computational studies on small wind turbine performance characteristics To cite this article: N Karthikeyan and T Suthakar 2016 J. Phys.: Conf. Ser.
More informationCFD AND EXPERIMENTAL STUDY OF AERODYNAMIC DEGRADATION OF ICED AIRFOILS
Colloquium FLUID DYNAMICS 2008 Institute of Thermomechanics AS CR, v.v.i., Prague, October 22-24, 2008 p.1 CFD AND EXPERIMENTAL STUDY OF AERODYNAMIC DEGRADATION OF ICED AIRFOILS Vladimír Horák 1, Dalibor
More informationVECTORS Important Questions from CBSE point of view
VECTORS Important Questions from CBSE point of view LEVEL-1 1. Two forces have their resultant equal to either. At what angle are they inclined? 2. Add a velocity of 30 m/s eastwards to a velocity of 40
More informationExperimental investigation on the aerodynamic loads and wake flow features of low aspect-ratio triangular prisms at different wind directions
Journal of Fluids and Structures 25 (2009) 1119 1135 www.elsevier.com/locate/jfs Experimental investigation on the aerodynamic loads and wake flow features of low aspect-ratio triangular prisms at different
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 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 informationCFD ANALYSIS AND COMPARISON USING ANSYS AND STAR-CCM+ OF MODEL AEROFOIL SELIG 1223
International Journal of Mechanical Engineering and Technology (IJMET) Volume 8, Issue 11, November 2017, pp. 312 318, Article ID: IJMET_08_11_034 Available online at http://www.iaeme.com/ijmet/issues.asp?jtype=ijmet&vtype=8&itype=11
More informationAERODYNAMIC FEATURES AS AUXILIARY ARCHITECTURE
N. Gu, S. Watanabe, H. Erhan, M. Hank Haeusler, W. Huang, R. Sosa (eds.), Rethinking Comprehensive Design: Speculative Counterculture, Proceedings of the 19th International Conference on Computer- Aided
More informationDESIGN AND CHARACTERISTICS OF A LARGE BOUNDARY- LAYER WIND TUNNEL WITH TWO TEST SECTIONS
The Seventh Asia-Pacific Conference on Wind Engineering, November 8-12, 2009, Taipei, Taiwan DESIGN AND CHARACTERISTICS OF A LARGE BOUNDARY- LAYER WIND TUNNEL WITH TWO TEST SECTIONS Kai Chen 1, Xin-Yang
More informationEXPERIMENTAL RESEARCH ON DETERMINATION OF DRAG COEFFICIENT OF THE GREENHOUSES LOCATED ON ROOFS OF BUILDINGS
Bulletin of the Transilvania University of Braşov Series II: Forestry Wood Industry Agricultural Food Engineering Vol. 9 (58) No.1-2016 EXPERIMENTAL RESEARCH ON DETERMINATION OF DRAG COEFFICIENT OF THE
More informationWind Flow Validation Summary
IBHS Research Center Validation of Wind Capabilities The Insurance Institute for Business & Home Safety (IBHS) Research Center full-scale test facility provides opportunities to simulate natural wind conditions
More informationDear Mr. Nicolini: Qualitative Pedestrian Level Wind Assessment Montreal Road, Ottawa GWE File No.: DTPLW
August 17, 2015 Anthony Nicolini 2068358 Ontario Inc. (Darwin Group) 183 Michael Cowpland Drive Ottawa, Ontario K2M 0M3 Dear Mr. Nicolini: Re: Qualitative Pedestrian Level Wind Assessment 807-825 Montreal
More informationUse of Equivalent Building Dimensions (EBD) to Characterize Upwind Terrain Wake Effects for AERMOD
Use of Equivalent Building Dimensions (EBD) to Characterize Upwind Terrain Wake Effects for AERMOD Paper # 425 100 th Annual Meeting of the Air & Waste Management Association June 2007 Ronald Petersen
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 informationA Simple Horizontal Velocity Model of a Rising Thermal Instability in the Atmospheric Boundary Layer
A Simple Horizontal Velocity Model of a Rising Thermal Instability in the Atmospheric Boundary Layer (In other words, how to take a closer look at downwind thermal drift) Abstract This pilot, as well as
More informationJOURNAL PUBLICATIONS
1 JOURNAL PUBLICATIONS 71. Lee, T., Mageed, A., Siddiqui, B. and Ko, L.S., (2016) Impact of ground proximity on aerodynamic properties of an unsteady NACA 0012 airfoil, submitted to Journal of Aerospace
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 informationBasic Fluid Mechanics
Basic Fluid Mechanics Chapter 7B: Forces on Submerged Bodies 7/26/2018 C7B: Forces on Submerged Bodies 1 Forces on Submerged Bodies Lift and Drag are forces exerted on an immersed body by the surrounding
More information