Wind and Structures

Techno-Press (테크노프레스)
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Exceedance probability as a tool to evaluate the wind environment of urban areas

  • Bady, Mahmoud (Graduate School of Engineering, The University of Tokyo) ;
  • Kato, Shinsuke (Institute of Industrial Science, The University of Tokyo) ;
  • Ishida, Yoshihiro (Institute of Industrial Science, The University of Tokyo) ;
  • Huang, Hong (Institute of Industrial Science, The University of Tokyo) ;
  • Takahashi, Takeo (Institute of Industrial Science, The University of Tokyo)
  • Received : 2008.03.11
  • Accepted : 2008.11.03
  • Published : 2008.12.25
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Abstract

The present study aims to estimate the wind ventilation performance for pedestrian level domains from the air quality point of view. Three typical models of a dense urban area were considered and numerically simulated in order to examine the effects of the geometry of such models on wind flow characteristics, which in turn affect the air quality, within the pedestrian domain of a street canyon located within this area. The calculated flow fields were employed to estimate the exceedance probabilities within the study domain using a new approach: air exchange rate within the domain. The study has been applied to nine cities in Japan: Tokyo, Osaka, Sapporo, Niigata, Fukuoka, Nagoya, Sendai, Yokohama, and Kyoto, based on their mean wind velocity data. The results demonstrated that the exceedance probability analysis of the pedestrian wind environment could be a valuable tool during the design stage of inhabited areas for the evaluation of pollutant-removal efficiency by the applied wind. Also, the calculated probabilities demonstrated substantial dependence on both the geometry of building arrays and the wind conditions of the nine cities.

Keywords

References

  1. Bady, M., Kato, S., Takahashi, T. and Huang, H. (2008), "A study on ventilation in densely populated urban areas, an experimental investigation of pedestrian wind environment and air quality within an urban street canyon", Submitted.
  2. Bady, M., Kato, S. and Hong, H. (2008), "Towards the application of indoor ventilation efficiency indices to evaluate the air quality of urban areas", Build. Environ., 43(12), 1991-2004. https://doi.org/10.1016/j.buildenv.2007.11.013
  3. Blocken, B. and Carmeliet, J. (2008), "Pedestrian wind conditions at outdoor platforms in a high-rise apartment building: generic sub-configuration validation, wind comfort assessment and uncertainty issues", Wind Struct., 11(1), 51-70. https://doi.org/10.12989/was.2008.11.1.051
  4. Blocken, B., Roels, S. and Carmeliet, J. (2004), "Modification of pedestrian wind comfort in the Silvertop tower passages by an automatic control system", J. Wind Eng. Ind. Aerodyn, 92, 849-873. https://doi.org/10.1016/j.jweia.2004.04.004
  5. Blocken, B., Stathopoulos, T. and Carmeliet, J. (2006), "Towards grid resolution guidelines for CFD simulations of wind speed in passages between buildings", The Fourth International Symposium on Computational Wind Engineering (CWE2006), 117-120, Yokohama, Japan.
  6. Blocken, B., Stathopoulos, T., Saathoff, P. and Wang, X. (2008), "Numerical evaluation of pollutant dispersion in the built environment: Comparisons between models and experiments", J. Wind Eng. Ind. Aerod., 96(10-11), 1817-1831. https://doi.org/10.1016/j.jweia.2008.02.049
  7. Ferziger, J. and Peric, M. (1997), Computational Methods for Fluid Dynamics, Second Edition, Springer, Germany.
  8. Huang, H., Ooka, R., Kato, S. and Jiang, T. (2006), "CFD analysis of ventilation efficiency around an elevated highway using visitation frequency and purging flow rate", Wind. Struct. 9(4), 297-313. https://doi.org/10.12989/was.2006.9.4.297
  9. Isyumov, N. and Davenport, A.G. (1975), "The ground level wind environment in built-up areas", Proceedings of Fourth International Conference of Wind Effect on Buildings and Structures, 403-422.
  10. Katsumata, W. (2004), "Strategies for improving the residential environment of existing suburban small-lot residential areas through harmoniously controlling the rebuilding of houses", PhD Thesis, The University of Tokyo, Japan (in Japanese).
  11. Melbourne W. (1978), "Wind environment studies in Australia", J. Ind. Aerodyn., 3(2-3), 201-214. https://doi.org/10.1016/0167-6105(78)90010-7
  12. Melbourne, W. (1978), "Criteria for environmental wind conditions", J. Ind. Aerodyn., 3(2-3), 241-249. https://doi.org/10.1016/0167-6105(78)90013-2
  13. Mochida, A, Tominaga, Y, Murakami, S, Yoshie, R., Ishihara, T. and Ooka, R. (2002), "Comparison of various $k-\varepsilon$ models and DSM applied to flow around a high-rise building- report on AIJ cooperative project for CFD prediction of wind environment", Wind Struct., 5(2-4), 227-244. https://doi.org/10.12989/was.2002.5.2_3_4.227
  14. Moriguchi, M., Matsuoka, Y. and Harasawa, H. (1995), "A finite difference model for automotive exhaust gas dispersion near urban roadways (I) Calculation scheme and two dimensional model for cross wind", J. Jap. Soc. Air Pollut., 30, 1-19 (in Japanese).
  15. Murakami, S. (1983), "Turbulence characteristics of wind flow at ground level in built-up area", J. Ind. Aerodyn., 15, 133-144. https://doi.org/10.1016/0167-6105(83)90184-8
  16. Murakami, S. (1986), "Study on acceptable criteria for assessing wind environment at ground level based on residents' diaries", J. Wind Eng. Ind. Aerodyn., 24(1), 1-18. https://doi.org/10.1016/0167-6105(86)90069-3
  17. Murakami, S., Mochida, A. and Hayashi, Y. (1988), "Modification of production terms in k-$\varepsilon$ model to remove overestimate of k value around windward corner", The Tenth Wind Engineering Symposium of Japan, 199-201, (in Japanese).
  18. Ohba, S., Kobayashi, N. and Murakami, S. (1998), "Study on the assessment of environmental wind conditions at ground level in a built-up area -based on long-term measurements using portable 3-cup anemometers", J. Wind Eng. Ind. Aerodyn., 28(1-3), 129-138.
  19. Patankar, S. (1980), "Numerical heat transfer and fluid flow", Hemisphere Publishing Corporation, New York.
  20. Ratcliff, M. and Peterka, J. (1990), "Comparison of pedestrian wind acceptability criteria", J. Wind Eng. Ind. Aerodyn., 36(1-3), 791-800. https://doi.org/10.1016/0167-6105(90)90076-O
  21. Richards, P., Mallinson, G., McMillan, D and Li, Y. (2002), "Pedestrian level wind speeds in downtown Auckland", Wind. Struct., 5(2-4), 151-164. https://doi.org/10.12989/was.2002.5.2_3_4.151
  22. STAR-CD, Methodology, STAR-CD, Version 3.22 (2004), Computational Dynamics Limited.
  23. Stathopoulos, T. (2006), "Pedestrian level winds and outdoor human comfort", J. Wind Eng. Ind. Aerodyn., 94, 769-780. https://doi.org/10.1016/j.jweia.2006.06.011
  24. Tominaga, Y., Mochida, A., Yoshie, R., Kataoka, H., Nozu, T., Yoshikawa, M. and Shirasawa, T. (2008), "AIJ guidelines for practical applications of CFD to pedestrian wind environment around buildings", J. Wind Eng. Ind. Aerodyn, 96(10-11), 1749-1761. https://doi.org/10.1016/j.jweia.2008.02.058
  25. Tominaga, Y. and Stathopoulos, T. (2007), "Turbulent Schmidt numbers for CFD analysis with various types of flowfield", Atmos. Environ., 41(37), 8091-8099. https://doi.org/10.1016/j.atmosenv.2007.06.054
  26. Tsai, M. and Chen, K. (2004), "Measurements and three-dimensional modeling of air pollutant dispersion in an urban street canyon", Atmos. Environ., 38(35), 5911-5924. https://doi.org/10.1016/j.atmosenv.2004.07.008
  27. Visser, G. and Cleijne, J. (1994), "Wind comfort predictions by wind tunnel tests: comparison with full-scale data", J. Wind Eng. Ind. Aerodyn., 52, 385-402. https://doi.org/10.1016/0167-6105(94)90061-2
  28. Wind Engineering Institute of Japan (2005), Fundamentals of Wind around Buildings, Kajama Publisher.
  29. Xiaomine, X., Huang, Z. and Wang, J. (2005), "Impact of building configuration on air quality in street canyon", Atmos. Environ., 39(25), 4519-4530. https://doi.org/10.1016/j.atmosenv.2005.03.043
  30. Yoshikawa, Y., Kunimi, H. and Ishizawa, S. (1997), "Numerical simulation model for predicting air quality along the urban main roads: (I) Development of atmospheric diffusion model", J. Jap. Mech. Soci., 63, 2507-2514 (in Japanese).

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