Effects of Freestream Turbulence on the Pressure Acting on a Low-Rise Building Roof in the Separated Flow Region

Fernández-Cabán, Pedro L.; Masters, Forrest J.

doi:10.3389/fbuil.2018.00017

Cited by 16 publications

(3 citation statements)

References 34 publications

(49 reference statements)

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“…In contrast, for turbulence with large integral scales, the gusts are relatively less frequent and allow more time for the shear layer vortices to grow in strength, which causes the surface pressures to fluctuate at a higher level. These effects on surface pressures have also been observed in the regions of separated flow on the roofs of low-rise buildings in the atmospheric boundary layer (e.g., see Fernandez-Caban & Masters, 2018, for a recent example). However, a complete understanding of how different levels of turbulence intensities and length scales in the incident flow affect the mean and fluctuating flow fields in and around the separation bubble has not been developed.…”

Section: Introductionmentioning

confidence: 71%

Turbulence structure and similarity in the separated flow above a low building in the atmospheric boundary layer

Akon

Kopp

2018

Journal of Wind Engineering and Industrial Aerodynamics

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Link to publication on Research at Birmingham portal General rights Unless a licence is specified above, all rights (including copyright and moral rights) in this document are retained by the authors and/or the copyright holders. The express permission of the copyright holder must be obtained for any use of this material other than for purposes permitted by law. • Users may freely distribute the URL that is used to identify this publication. • Users may download and/or print one copy of the publication from the University of Birmingham research portal for the purpose of private study or non-commercial research. • User may use extracts from the document in line with the concept of 'fair dealing' under the Copyright, Designs and Patents Act 1988 (?) • Users may not further distribute the material nor use it for the purposes of commercial gain. Where a licence is displayed above, please note the terms and conditions of the licence govern your use of this document. When citing, please reference the published version. Take down policy While the University of Birmingham exercises care and attention in making items available there are rare occasions when an item has been uploaded in error or has been deemed to be commercially or otherwise sensitive.

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Section: Introductionmentioning

confidence: 71%

Turbulence structure and similarity in the separated flow above a low building in the atmospheric boundary layer

Akon

Kopp

2018

Journal of Wind Engineering and Industrial Aerodynamics

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“…Different from MIV and EIV mechanisms that have been well investigated mentioned above, the coupled MIV-EIV mechanism of a hyperbolic paraboloid membrane structure in extreme wind events, such as typhoons, has been paid little attention. In tropical regions, typhoons have a typically complex vortex structure, which would increase mean wind velocity, gust factor, and turbulence intensity [23][24][25]. These increases lead to the decrease of the reattachment length over the membrane surface and the increase of the peak suction in the separation region [26].…”

Section: Of 17mentioning

confidence: 99%

Aeroelastic Experimental Investigation of Hyperbolic Paraboloid Membrane Structures in Normal and Typhoon Winds

Liu

Zhang

et al. 2022

Sustainability

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The lightweight and flexible membrane structure of roofs are susceptible to wind loads with the risk of damage and failure. Compared with uniform and low-level turbulence flow cases (i.e., normal winds) that have been well investigated, the wind-induced vibration problem of membrane structures in high-level turbulence flows such as typhoons has been paid little attention. To address the gap, this paper aimed at investigating the aerodynamic behavior of hyperbolic paraboloid membrane structures in normal and typhoon winds by a series of wind tunnel tests. Some distinct wind characteristics of upcoming normal and typhoon flows in terms of vertical profiles of wind velocity, turbulence intensity, and power spectrum density of fluctuating winds were well simulated in an automatically controlled wind tunnel. The aeroelastic behavior of a scaled model was analyzed and discussed in terms of displacement time-history responses, probability distribution characteristics, and dynamic characteristics including the natural frequency, mode shape, and damping ratio. Results show that the increasing suction in a typhoon leads to significant growth in maximum deformations and more risks to suffer from aeroelastic instability. Non-Gaussian characteristics appear more remarkable with skewness and kurtosis increasing almost two-fold in typhoons. Structural modal parameters are influenced by both turbulence intensity and wind velocity. This study provides basic insights into the deficiency of dynamic response of membrane structures in typhoons, and promotes the applications of membrane structures in green buildings.

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“…Gust generators have been widely used to study the unsteady aerodynamic effects of atmospheric flows by modeling natural wind turbulence [1,2]. They constitute important instruments in a wide range of applications that range from the experimental exploration of gusts on uncrewed aerial vehicles (UAV's) [3,4], to gust responses of high aspect ratio wings [5,6], to high speed vehicle environmental effects [7], and atmospheric and building related flows [8,9].…”

Section: Introductionmentioning

confidence: 99%

Design, Construction and Evaluation of an Oscillating Vane Gust Generator for Atmospheric Flow Simulation

French

Friess

Goupee

et al. 2021

Wind

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The study of unsteady aerodynamic phenomena in wind tunnels is supported by gust-generating devices capable of generating adjustable magnitude and periodicity velocity fluctuations in a flowfield. Gusts are typically generated actively by introducing moving vanes to direct the flow, or passively by tailoring the boundary layer growth and shape in the tunnel. The flow facility used here is a student-built closed-return low-speed wind tunnel, with a test section size of 750 mm × 750 mm and a maximum speed of 25 m/s. A two-vane gust generator utilizing NACA0018 airfoil sections of 150 mm chord length was designed and installed upstream of the test section. The flowfield was mapped with the installed vanes with and without gust actuation, utilizing a hot wire system. The tunnel with gust vanes exhibits a spatially uniform baseline turbulence intensity of 5%, with a steady state velocity deficit of 1 m/s in the vane–wake region. Upon introducing the gusting conditions at vane deflection angles of up to ±45°, velocity differences of up to 4 m/s were attained at 18 m/s freestream velocity at oscillation frequencies ranging between 1 Hz and 2 Hz.

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Effects of Freestream Turbulence on the Pressure Acting on a Low-Rise Building Roof in the Separated Flow Region

Cited by 16 publications

References 34 publications

Turbulence structure and similarity in the separated flow above a low building in the atmospheric boundary layer

Turbulence structure and similarity in the separated flow above a low building in the atmospheric boundary layer

Aeroelastic Experimental Investigation of Hyperbolic Paraboloid Membrane Structures in Normal and Typhoon Winds

Design, Construction and Evaluation of an Oscillating Vane Gust Generator for Atmospheric Flow Simulation

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