AIJ cooperative project for practical applications of CFD to urban ventilation

Ryuichiro Yoshie, Akashi Mochida, Yoshihide Tominaga, Taichi Shirasawa, Hideyuki Tanaka

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

"AIJ guidelines for practical applications of CFD to pedestrian wind environment around buildings" were recently published, which were mainly targeted for strong wind problems around high-rise buildings. However, urban heat island phenomenon and air pollution problem become serious in weak wind regions such as behind buildings and within the street canyons. Urban ventilation is now broadly recognized as one of the effective countermeasures to tackle these problems, thus it is becoming extremely important to ensure adequate air ventilation in weak wind regions. In order to apply CFD techniques to estimate the air ventilation, thermal and pollutant dispersion in urban areas, it is important to assess the performance of turbulence models that to be adopted for simulating these phenomena. Thus, a new working group was organized by the Architectural Institute of Japan (AIJ) to implement this validation. As the first step of the work, wind tunnel experiments and CFD simulations for gas and thermal dispersion behind a high-rise building in unstable non-isothermal turbulent flow were carried out. Standard k-ε model and"two-equation model for heat transfer" were used as the investigated turbulence model in this study. The calculated results of these two models showed that there was little difference between these models, and both models overestimated the size of the recirculation region behind the building and underestimated the lateral dispersion of the gas.

Original languageEnglish
Title of host publication7th Asia-Pacific Conference on Wind Engineering, APCWE-VII
Publication statusPublished - 2009 Dec 1
Event7th Asia-Pacific Conference on Wind Engineering, APCWE-VII - Taipei, Taiwan, Province of China
Duration: 2009 Nov 82009 Nov 12

Publication series

Name7th Asia-Pacific Conference on Wind Engineering, APCWE-VII

Other

Other7th Asia-Pacific Conference on Wind Engineering, APCWE-VII
CountryTaiwan, Province of China
CityTaipei
Period09/11/809/11/12

Keywords

  • CFD
  • Non-isothermal flow
  • Pollutant dispersion
  • Urban ventilation

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment

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  • Cite this

    Yoshie, R., Mochida, A., Tominaga, Y., Shirasawa, T., & Tanaka, H. (2009). AIJ cooperative project for practical applications of CFD to urban ventilation. In 7th Asia-Pacific Conference on Wind Engineering, APCWE-VII (7th Asia-Pacific Conference on Wind Engineering, APCWE-VII).