A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Pedestrian-level wind and gust around buildings with a ‘lift-up’ design: Assessment of influence from surrounding buildings by adopting LES
Abstract An architectural feature, ‘lift-up’ (or elevated) design, has been reported as an effective design to improve weak pedestrian-level wind (PLW) conditions in a subtropical high-density city. This design provides a semi-outdoor space under the elevated building which allows wind to penetrate through, but the influence of surrounding buildings on its performance has been rarely reported. This study aims to assess the influence of surrounding buildings on the PLW around an elevated building. LES (large eddy simulation) approach is applied after validation against the previous wind tunnel tests. Validation studies have confirmed and proven the accuracy of LES for the simulations, with the correlation coefficients R above 0.89 between the predictions and the experiments. Furthermore, the differences of flow fields are assessed around a single elevated building and a building array with an open space, a building and an elevated building respectively in the centre. Results indicate that wind amplification exists within the semi-outdoor space under the elevated building in all conditions although this effect is partially lowered by the surrounding buildings. The fields of turbulence intensity and gust wind speed around the surrounded elevated building are investigated by LES. These findings can be helpful for using the ‘lift-up’ design to improve wind and thermal comfort at pedestrian level.
Pedestrian-level wind and gust around buildings with a ‘lift-up’ design: Assessment of influence from surrounding buildings by adopting LES
Abstract An architectural feature, ‘lift-up’ (or elevated) design, has been reported as an effective design to improve weak pedestrian-level wind (PLW) conditions in a subtropical high-density city. This design provides a semi-outdoor space under the elevated building which allows wind to penetrate through, but the influence of surrounding buildings on its performance has been rarely reported. This study aims to assess the influence of surrounding buildings on the PLW around an elevated building. LES (large eddy simulation) approach is applied after validation against the previous wind tunnel tests. Validation studies have confirmed and proven the accuracy of LES for the simulations, with the correlation coefficients R above 0.89 between the predictions and the experiments. Furthermore, the differences of flow fields are assessed around a single elevated building and a building array with an open space, a building and an elevated building respectively in the centre. Results indicate that wind amplification exists within the semi-outdoor space under the elevated building in all conditions although this effect is partially lowered by the surrounding buildings. The fields of turbulence intensity and gust wind speed around the surrounded elevated building are investigated by LES. These findings can be helpful for using the ‘lift-up’ design to improve wind and thermal comfort at pedestrian level.
Pedestrian-level wind and gust around buildings with a ‘lift-up’ design: Assessment of influence from surrounding buildings by adopting LES
Liu, Jianlin (author) / Zhang, Xuelin (author) / Niu, Jianlei (author) / Tse, K. T. (author)
Building Simulation ; 12 ; 1107-1118
2019-05-21
12 pages
Article (Journal)
Electronic Resource
English
urban microclimate , pedestrian-level wind , LES (large eddy simulation) , ‘lift-up’ design , surrounding buildings Engineering , Building Construction and Design , Engineering Thermodynamics, Heat and Mass Transfer , Atmospheric Protection/Air Quality Control/Air Pollution , Monitoring/Environmental Analysis
Computer-Aided Prediction of Pedestrian-Level Wind Environment Around Buildings
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Detached eddy simulation of pedestrian-level wind and gust around an elevated building
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