Top

Published in:

2019 | OriginalPaper | Chapter

Transitional Shear Layers on Rectangular Sections

Authors : D. M. Moore, C. W. Letchford, M. Amitay

Published in: Proceedings of the XV Conference of the Italian Association for Wind Engineering

Publisher: Springer International Publishing

Activate our intelligent search to find suitable subject content or patents.

search-config

AI-assisted search

Off

Abstract

The present work implements 2D Particle Image Velocimetry measurements in an effort to study the transition process of the separated shear layer on rectangular sections. Inspection of the average and fluctuating vector fields enable quantitative definitions of important length scales such as transition lengths and reattachment lengths. The effect of free stream Reynolds number is examined in detail which, among other points, show clear trends of increasingly rapid transitions lengths over the wind speeds investigated. Additionally, transitional shear layer dynamics are discussed for sections exposed to inclined winds. It is shown that under small angles of attack, relatively large changes in shear layer trajectory result in significant alterations to the global loads felt by the body.

Dont have a licence yet? Then find out more about our products and how to get one now:

Springer Professional "Wirtschaft+Technik"

Online-Abonnement

Mit Springer Professional "Wirtschaft+Technik" erhalten Sie Zugriff auf:

über 102.000 Bücher
über 537 Zeitschriften

aus folgenden Fachgebieten:

Automobil + Motoren
Bauwesen + Immobilien
Business IT + Informatik
Elektrotechnik + Elektronik
Energie + Nachhaltigkeit
Finance + Banking
Management + Führung
Marketing + Vertrieb
Maschinenbau + Werkstoffe
Versicherung + Risiko

Jetzt Wissensvorsprung sichern!

inform now

Springer Professional "Technik"

Online-Abonnement

Mit Springer Professional "Technik" erhalten Sie Zugriff auf:

über 67.000 Bücher
über 390 Zeitschriften

aus folgenden Fachgebieten:

Automobil + Motoren
Bauwesen + Immobilien
Business IT + Informatik
Elektrotechnik + Elektronik
Energie + Nachhaltigkeit
Maschinenbau + Werkstoffe

Jetzt Wissensvorsprung sichern!

inform now

Springer Professional "Wirtschaft"

Online-Abonnement

Mit Springer Professional "Wirtschaft" erhalten Sie Zugriff auf:

über 67.000 Bücher
über 340 Zeitschriften

aus folgenden Fachgebieten:

Bauwesen + Immobilien
Business IT + Informatik
Finance + Banking
Management + Führung
Marketing + Vertrieb
Versicherung + Risiko

Jetzt Wissensvorsprung sichern!

inform now

previous chapter Wind–Wave Loading and Response of OWT Monopiles in Rough Seas

next chapter An Immersed Boundary CFD Code for Building and Environment Applications

Achenbach E (1971) Influence of surface roughness on the cross-flow around a circular cylinder. J Fluid Mech 46(2):321–335CrossRef

Betchov R, Criminale WO (1966) Spatial instability of the inviscid jet and wake. Phys Fluids 9(2):359–362CrossRef

Brown G, Roshko A (1974) On density effects and large structure in turbulent mixing layers. J Fluid Mech 64:775–816CrossRef

Bruno L, Salvetti MV, Ricciardelli F (2014) Benchmark on the aerodynamics of a rectangular 5:1 cylinder: an overview after the first four years of activity. J Wind Eng Ind Aerodyn 126:87–106CrossRef

Drazin PG (2002) Introduction to Hydrodynamic Stability. Cambridge University Press, CambridgeCrossRef

Gartshore I (1973) Gartshore 1973 BLWTL report-4-73. CAN, London

Haller G (2005) An objective definition of a vortex. J Fluid Mech 525:1–26MathSciNetCrossRef

Huerre P, Monkewitz PA (1985) Absolute and convective instabilities in free shear layers. J Fluid Mech 159:151–168MathSciNetCrossRef

Lander DC, Moore D, Letchford CW, Amitay M (2018) Scaling of square prism shear layers. J Fluid Mech 849:1096–1119CrossRef

Mannini C, Marra AM, Pigolotti L, Bartoli G (2017) The effects of free-stream turbulence and angle of attack on the aerodynamics of a cylinder with rectangular 5:1 cross section. J Wind Eng Ind Aerodyn 161:42–58CrossRef

Mannini C, Šoda A, Schewe G (2010) Computers & fluids unsteady RANS modelling of flow past a rectangular cylinder: investigation of reynolds number effects. Comput Fluids 39(9):1609–1624CrossRef

Michalke A (1964) On the inviscid instability of the hyperbolic tangent velocity profile. J Fluid Mech 19(04):543–556MathSciNetCrossRef

Monkewitz PA (1982) Influence of the velocity ratio n the spatial instability of mixing layers. Phys Fluids 25(7):1137–1143CrossRef

Mooneghi MA, Irwin P, Chowdhury AG, Technology A, Francisco S (2015) Partial turbulence simulation method for small structures, June, pp 1–11

Roshko A (1954) On the drag and shedding frequency of two-dimensional bluff bodies. National Advisory Committee for Aeronautics, Washington, D.C.

Saatoff PJ, Melbourne WH (1997) Effects of free-stream turbulence on surface pressure fluctuations in a separation bubble. J Fluid Mech 337(1997):1–24CrossRef

Schewe G (2013) Reynolds-number-effects in flow around a rectangular cylinder with aspect ratio 1:5. J Fluids Struct 39:15–26CrossRef

Schmid P, Henningson D (2001) Stability and Transition in Shear Flows. Springer-Verlag New York Inc., USACrossRef

Shimada K, Ishihara T (2001) Application of a modified k-e model to the prediction of aerodynamic characteristics of rectangular cross-section cylinders. J Fluids Struct 16(15):399–413

Sigurdson LW (1986) The structure and control of a turbulent reattaching flow. California Institute of Technology

Unal MF, Rockwell D (1988) On vortex formation from a cylinder. Part 1. the initial instability. J Fluid Mech 190:491–512CrossRef

Title: Transitional Shear Layers on Rectangular Sections
Authors: D. M. Moore
C. W. Letchford
M. Amitay
Publisher: Springer International Publishing
Book: Proceedings of the XV Conference of the Italian Association for Wind Engineering
Print ISBN: 978-3-030-12814-2

Electronic ISBN: 978-3-030-12815-9

Copyright Year: 2019
DOI: https://doi.org/10.1007/978-3-030-12815-9_40

Springer Professional

Abstract

Please log in to get access to your license.

Dont have a licence yet? Then find out more about our products and how to get one now:

Springer Professional "Wirtschaft+Technik"

Springer Professional "Technik"

Springer Professional "Wirtschaft"

Premium Partners