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Wind direction field under the influence of topography, part I: A descriptive model
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  • Journal title : Wind and Structures
  • Volume 22, Issue 4,  2016, pp.455-476
  • Publisher : Techno-Press
  • DOI : 10.12989/was.2016.22.4.455
 Title & Authors
Wind direction field under the influence of topography, part I: A descriptive model
Weerasuriya, A.U.; Hu, Z.Z.; Li, S.W.; Tse, K.T.;
 Abstract
In both structural and environmental wind engineering, the vertical variation of wind direction is important as it impacts both the torsional response of the high-rise building and the pedestrian level wind environment. In order to systematically investigate the vertical variation of wind directions (i.e., the so-called `twist effect`) induced by hills with idealized geometries, a series of wind-tunnel tests was conducted. The length-to-width aspect ratios of the hill models were 1/3, 1/2, 1, 2 and 3, and the measurements of both wind speeds and directions were taken on a three-dimensional grid system. From the wind-tunnel tests, it has been found that the direction changes and most prominent at the half height of the hill. On the other hand, the characteristic length of the direction change, has been found to increase when moving from the windward zone into the wake. Based on the wind-tunnel measurements, a descriptive model is proposed to calculate both the horizontal and vertical variations of wind directions. Preliminarily validated against the wind-tunnel measurements, the proposed model has been found to be acceptable to describe the direction changes induced by an idealized hill with an aspect ratio close to 1. For the hills with aspect ratios less than 1, while the description of the vertical variation is still valid, the horizontal description proposed by the model has been found unfit.
 Keywords
descriptive model;hill terrain;wind characteristics;wind-tunnel test;
 Language
English
 Cited by
1.
Wind direction field under the influence of topography: part II: CFD investigations,;;;;

Wind and Structures, 2016. vol.22. 4, pp.477-501 crossref(new window)
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A wind tunnel study of effects of twisted wind flows on the pedestrian-level wind field in an urban environment, Building and Environment, 2018, 128, 225  crossref(new windwow)
2.
New inflow boundary conditions for modeling twisted wind profiles in CFD simulation for evaluating the pedestrian-level wind field near an isolated building, Building and Environment, 2018  crossref(new windwow)
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Simulation of twisted wind flows in a boundary layer wind tunnel for pedestrian-level wind tunnel tests, Journal of Wind Engineering and Industrial Aerodynamics, 2016, 159, 99  crossref(new windwow)
4.
Pedestrian-level wind environment around isolated buildings under the influence of twisted wind flows, Journal of Wind Engineering and Industrial Aerodynamics, 2017, 162, 12  crossref(new windwow)
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