Pedestrian-level wind environment around isolated buildings under the influence of twisted wind flows

Tse, Kam Tim; Weerasuriya, Asiri Umenga; Zhang, Xiaowu; Li, S.; Kwok, K.C.S.

doi:10.1016/j.jweia.2017.01.002

Cited by 57 publications

(32 citation statements)

References 31 publications

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“…In other words, there were four types of vanes employed to simulate twisted wind profiles in this study. The previous publications of the authors [18][19][20] provide more details of the vane system.…”

Section: Simulation Of Twisted Wind Profilesmentioning

confidence: 99%

“…The PLW fields in the twisted and conventional wind flows are evaluated using normalised mean wind speed ratio (K). Several researchers have employed the K value to evaluate PLW fields near isolated buildings and groups of buildings [18,19,[33][34][35][36]. In this study, the K value is calculated using Equation (1)…”

Section: The Pedestrian Wind Comfort Criteriamentioning

confidence: 99%

“…The vertical variation in wind directions is a topic that has been insensitively studied in the field of yacht sail's aerodynamic [15][16][17]. Conversely, directional variations in a wind flow have not been systematically investigated in the field of wind engineering until very recent when Tse et al [18][19][20] conducted a series of wind tunnel tests using twisted wind profiles. Tse et al [18] first simulated twisted wind profiles, which have varying wind directions along the profile's height, in a BLWT and then used them for the wind tunnel tests to show the ways that twisted wind flows modify the PLW field near isolated buildings and arrays of buildings [19,20].…”

Section: Introductionmentioning

confidence: 99%

“…Conversely, directional variations in a wind flow have not been systematically investigated in the field of wind engineering until very recent when Tse et al [18][19][20] conducted a series of wind tunnel tests using twisted wind profiles. Tse et al [18] first simulated twisted wind profiles, which have varying wind directions along the profile's height, in a BLWT and then used them for the wind tunnel tests to show the ways that twisted wind flows modify the PLW field near isolated buildings and arrays of buildings [19,20]. Although these wind tunnel tests are indicative of the impact of twisted winds on the PLW field near https://doi.org/10.1016/j.buildenv.2017.11.041 Received 25 September 2017; Received in revised form 27 November 2017; Accepted 27 November 2017 generic buildings, it is not yet fully understood whether twisted wind profiles have similar importance in assessing the PLW field in an urban area.…”

Section: Introductionmentioning

confidence: 99%

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A wind tunnel study of effects of twisted wind flows on the pedestrian-level wind field in an urban environment

Weerasuriya

Tse

Zhang

et al. 2018

Building and Environment

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The influence of twisted wind flows on the pedestrian-level wind (PLW) field of an urban area was evaluated by testing a typical urban site (Tsuen Wan, Hong Kong) in a boundary layer wind tunnel. Four twisted wind profiles with different magnitudes and directions of yaw angles were employed to investigate variations in wind speed with the properties of the twisted wind flows at the pedestrian level. An additional conventional wind profile with similar wind speeds and turbulence intensities to the twisted winds but with zero yaw angles was simulated for comparisons. The mean wind speeds at 77 locations including the perimeter, roadsides, and groups of highrise buildings were analysed for the conventional and the four twisted wind flows. The comparisons show a tendency of twisted winds to generate higher wind speeds at the pedestrian level than the conventional wind profile. The wind speeds of the twisted winds have a strong dependence on the magnitude and direction of the yaw angles, particularly at locations where the densities of buildings in the neighbourhood are low and hence local wind circulations are significantly modified by the twisted winds.

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Section: Simulation Of Twisted Wind Profilesmentioning

confidence: 99%

Section: The Pedestrian Wind Comfort Criteriamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A wind tunnel study of effects of twisted wind flows on the pedestrian-level wind field in an urban environment

Weerasuriya

Tse

Zhang

et al. 2018

Building and Environment

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“…Given that most urban areas in Hong Kong are located near mountains, and yaw angles have been observed to reach as much as 40°, Tse et al [11] proposed to employ twisted wind profiles in wind tunnel tests when the urban PLW field of Hong Kong is concerned. To follow up on this, Tse et al [15,16] conducted a series of wind tunnel tests to investigate the PLW fields around isolated buildings and arrays of buildings with different dimensions. Their results [15] revealed noticeable flow modifications in the PLW field under the influence of twisted wind flows.…”

Section: Introductionmentioning

confidence: 99%

New inflow boundary conditions for modeling twisted wind profiles in CFD simulation for evaluating the pedestrian-level wind field near an isolated building

Weerasuriya

Zhang

et al. 2018

Building and Environment

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The hilly topography of Hong Kong influences oncoming winds and gradually changes their wind directions along the profiles' height. The vertical variation in wind directions, or the twist effect, significantly influences the Pedestrian Level Wind (PLW) field in urban areas of Hong Kong, thus it is a topic demanding systematic investigations. In this study, a new set of inflow boundary conditions are proposed to model twisted wind flows in Computational Fluid Dynamic (CFD) simulations. The new inflow boundary condition derived based on the horizontal homogeneous assumption, specifies a vertical profile of lateral wind speeds at the inlet boundary to sustain the twist effect in the empty computational domain. The proposed boundary conditions are used to simulate the PLW fields near three isolated buildings with different Height-to-Width ratio using two CFD codes; OpenFOAM, and FLUENT. The results reveal that OpenFOAM is more reliable in simulating PLW fields in twisted wind flows using the new set of boundary conditions. The three-dimensional flow field provided by the OpenFOAM simulation shows sparse streamlines downstream the buildings, indicating lack of organized eddies in the building far wake, which negatively affects the dispersion of air pollutants in twisted winds.

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Assessment of Local Pressure Coefficient Over Conventional and Unconventional Tall Buildings

Rajasekarababu

Vinayagamurthy

2020

Lecture Notes in Mechanical Engineering

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Pedestrian-level wind environment around isolated buildings under the influence of twisted wind flows

Cited by 57 publications

References 31 publications

A wind tunnel study of effects of twisted wind flows on the pedestrian-level wind field in an urban environment

A wind tunnel study of effects of twisted wind flows on the pedestrian-level wind field in an urban environment

New inflow boundary conditions for modeling twisted wind profiles in CFD simulation for evaluating the pedestrian-level wind field near an isolated building

Assessment of Local Pressure Coefficient Over Conventional and Unconventional Tall Buildings

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