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The influence of terrain on the mean wind flow characteristics in a fjord

The influence of terrain on the mean wind flow characteristics in a fjord


Title: The influence of terrain on the mean wind flow characteristics in a fjord
Author: Cheynet, Etienne
Liu, Shengnan
Ong, Muk Chen
Bogunović Jakobsen, Jasna
Snaebjornsson, Jonas Thor   orcid.org/0000-0003-4391-9925
Gatin, Inno
Date: 2020-10
Language: English
Scope: 104331
University/Institute: Háskólinn í Reykjavík
Reykjavik University
School: Tæknisvið (HR)
School of Technology (RU)
Department: Verkfræðideild (HR)
Department of Engineering (RU)
ISSN: 0167-6105
1872-8197 (eISSN)
DOI: 10.1016/j.jweia.2020.104331
Subject: Civil and Structural Engineering; Full-scale; Computational fluid dynamics; Complex terrain; Steady RANS; Suspension bridge; Byggingarverkfræði; Burðarþolsfræði; Straumfræði; Hermun; Straumfræði; Landslag; Firðir; Þrívídd; Vindálag; Vindmælingar; Hengibrýr
URI: https://hdl.handle.net/20.500.11815/2474

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Citation:

Cheynet, E., Liu, S., Ong, M. C., Jakobsen, J. B., Snaebjornsson, J., & Gatin, I. (2020). The influence of terrain on the mean wind flow characteristics in a fjord. Journal of Wind Engineering and Industrial Aerodynamics, 205, 104331. https://doi.org/10.1016/j.jweia.2020.104331

Abstract:

Flow conditions in complex terrains such as fjords are highly three-dimensional and thus not properly captured by the wind flow models developed for homogenous terrains. In the present study, we explore the potential of computational fluid dynamics (CFD) simulations relying on the steady 3D Reynolds-averaged Navier-Stokes equations to complement in-situ measurements from a long-span bridge in a narrow fjord. The validation is done using velocity data recorded in 2017 and 2018 by nine sonic anemometers mounted above the deck of a fjord-crossing suspension bridge. The flow characteristics studied are the along-bridge profile of the mean wind velocity, mean wind direction and mean angle of attack. The simulated flow shows that the non-uniform distributions of the mean angles of attack and wind direction along the bridge span are likely due to side-valley flows, which under certain conditions, predominate over those coming from the main valley. The measurements suggest that wind conditions corresponding to the dominating side-valley flows are associated with a high turbulence intensity at the bridge deck position. The paper highlights the complementary role of CFD studies and in-situ measurements for the design of a wind-sensitive structure, which may not be available using traditional semi-empirical modelling of topography effects.

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This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

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