COE Researcher, Department of Architecture, Tokyo Polytechnic University, 1583 Iiyama, Atsugi-city, Kanagawa, Japan, chenghu@arch.t-kougei.ac.jp Professor, Department of Architecture, Tokyo Polytechnic University, 1583 Iiyama, Atsugi-city, Kanagawa, Japan, ohba@arch.t-kougei.ac.jp Professor, Department of Architecture, Tokyo Polytechnic University, 1583 Iiyama, Atsugi-city, Kanagawa, Japan, yoshie@arch.t-kougei.ac.jp

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Wind Engineers JAWE (2004)

Yoshihide TOMINAGA Akashi Mochida Hiroto KATAOKA Kazuyoshi HARIMOTO Cheng-Hu Hu

10.5359/jawe.2004.99_49

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MB3 Ventilation 1

Wind Engineers JAWE (2006)

Satoshi Ogaki Tatsuya Iwasaki Takamasa Hasama Shinsuke Kato Ryozo Ooka

In many production process, there are a lot of heat sources.Undesirable problems caused by hot air flow from heat sources are in there.There are actually a lot of cases which coarse particles are lifted to the ceiling by updraft in a production room.Ventilation property changes greatly by buoyancy to occur in difference of temperature and balance of the wind pressure.This paper describes investigations based on measurements and computer simulations in the production process.The effects of heat sources, ventilation and dust distribution in production rooms will be discussed.

10.5359/jawe.2006.239

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Uncertainty in Measurements of Velocity and Concentration around a Building

Journal of Web Engineering (2006)

Hideyuki Tanaka Ryuichiro Yoshie Cheng-Hu Hu

As with the progress of computing capacity in recent years, there have been many CFD studies concerned with the wind environment and the pollutant diffusion in urban areas. Currently, Steady solutions with RANS models (Steady RANS) are commonly used for this type of studies. However, CFD simulations with Steady RANS have some drawbacks that the reattachment length and pollutant gas concentration are overestimated behind the building, because they cannot reproduce periodic vortex shedding in the weak wind region behind the buildings. Therefore, applying the Steady RANS may be unsatisfactory for predicting pollutant diffusion and ventilation in the weak wind region behind the buildings. In this paper, we aim to provide adaptive experimental data required to verify the accuracy of numerical simulation. In order to show the reliability of experimental data, we evaluated the uncertainty of measurements for wind velocity and concentration, and verified the method for management of accuracy.

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CFD modelling of unsteady cross ventilation flows using LES

Journal of Wind Engineering and Industrial Aerodynamics (2008)

Cheng-Hu Hu Masaaki Ohba Ryuichiro Yoshie

10.1016/j.jweia.2008.02.031

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Using a CFD approach for the study of street-level winds in a built-up area

Building and Environment (2004)

Cheng-Hu Hu Fan Wang