Impacts of building layout on pedestrian level wind comfort and gas pollutant diffusion

Yi Yang; Tianxiao Zhang; Haiying Xie; Xiaoxiao Wang

doi:10.18502/japh.v6i2.7954

Yi Yang Department of Environmental Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, P R China
Tianxiao Zhang Department of Environmental Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, P R China
Haiying Xie Department of Environmental Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, P R China
Xiaoxiao Wang Department of Environmental Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, P R China

DOI: https://doi.org/10.18502/japh.v6i2.7954

Keywords: Building layout, Computational fluid dynamics (CFD); Pedestrian level wind comfort; Gas pollutant diffusion

Abstract

Introduction: The impacts of building layout on pedestrian level wind comfort and gas pollutant diffusion are simulated using computational fluid dynamics method.

Materials and methods: The control equations of flow and pollutant diffusion are solved by using ANSYS Fluent. The SIMPLE algorithm is selected for the pressure-velocity coupling. The data from wind tunnel experiment at Tokyo Polytechnic University is employed in the validation case.

Results: The velocity field and turbulence intensity at pedestrian level under different building layouts are obtained. The distribution and evaluation of wind comfort grade and pollutant concentration are given.

Conclusion: Building layouts have significant impacts on flow and pollutant diffusion at pedestrian level. The outward staggered layout of building group can improve both wind comfort grade and air quality, but the inward staggered layout has the adverse effect. Non-staggered layouts are the worst in terms of the wind comfort grade in this paper.