국제초고층학회논문집 (International Journal of High-Rise Buildings)

  • 제11권4호
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  • Pages.301-314
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  • 2022
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  • 2234-7224(pISSN)
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  • 2288-9930(eISSN)
한국초고층도시건축학회 (Council on Tall Building and Urban Habitat Korea)
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Verification of Speed-up Mechanism of Pedestrian-level Winds Around Square Buildings by CFD

  • Hideyuki Tanaka (Takenaka Research & Development Institute, Takenaka Corporation) ;
  • Qiang Lin (School of Civil Engineering, Chongqing University) ;
  • Yasuhiko Azegami (Takenaka Research & Development Institute, Takenaka Corporation) ;
  • Yukio Tamura (School of Civil Engineering, Chongqing University)
  • 발행 : 2022.12.01
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초록

Various studies have been conducted on pedestrian-level wind environments around buildings. With regard to the speed-up mechanism of pedestrian-level winds, there are references to downwash effect due to the vertical pressure gradient of boundary layer flow and venturi effect due to flow blocking by the building. Two factors contribute to increase or decrease of downwash effect: change in twodimensional / three-dimensional air flow pattern (Type 1) and change in downwash wind speed due to building size that does not accompany change in airflow pattern (Type 2). Previous studies have shown that downwash effect has a greater influence in increasing or decreasing the area of strong wind than venturi effect. However, these considerations are derived from the horizontal mean wind speed distribution at pedestrian level and are not the result of three-dimensional flow field around the building. Therefore, in this study, Computational Fluid Dynamics using Large Eddy Simulation were performed to verify the downwash phenomena that contributes to increase in wind speed at pedestrian level.

키워드

과제정보

This research is part of the research of a research group with Professor Akihito Yoshida of Tokyo Polytechnic University, and we hereby express our gratitude to him. Part of this research used the computational resources of the supercomputer Fugaku provided by the RIKEN Center for Computational Science (Project ID: hp210292). Part of this research was funded by the scholarship from China Scholarship Council (No. 202006050113).

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