EXPERIMENTAL STUDY ON SPATIAL STRUCTURE OF AIRFLOW AROUND BUILDINGS IN URBAN AREA : Part I. Investigations on the characteristics of airflow around regularly arranged city models

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  • 市街地における建築物周辺気流の立体的構造に関する研究 : その 1. 規則的配列模型周辺気流の性状について
  • 市街地における建築物周辺気流の立体的構造に関する研究-1-規則的配列模型周辺気流の性状について
  • シガイチ ニ オケル ケンチクブツ シュウヘン キリュウ ノ リッタイテキ コ

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The purpose of this study is to investigate the behavior of airflow in urban area and to obtain some information on the points mentioned below. 1) Calculation of natural ventilation. 2) Precise estimation of heat road for building air conditioning. 3) Protection against air pollution due to gas emission from auto-mobiles and buildings. 4) Prevension of public nuisance due to strong wind around tall buildings. For the purpose, several wind tunnel experiment were made. At first, we arranged many city-block models regularly in the wind tunnel and measured wind velocity, momentum flux, mixing length and so on. As a result, following remarks may be made. 1) Wind profiles above the streets to which wind direction is at right angles are nearly conform to the log-low in upper part (Z≧Z_0), but above the streets with which wind direction is in parallel, those are not necessarily conform to log-low. 2) The pattern of vertical distribution of friction velocity u_* is that in lower part (Z≦Z_0) the value of u_* is small, but in upper part u_* increases and becomes constant (u_*≃0.2). [cf. Fig.35, 36] 3) Mixing lengths increase in proportion to height (Z) in upper part (Z≧Z_0), but near the limit of boundary layer, they decrease to zero. [cf. Fig.37, 38] and so on.

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