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Wind and Structures Volume 11, Number 5, September 2008 , pages 413-426 DOI: https://doi.org/10.12989/was.2008.11.5.413 |
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Influence of spacing between buildings on wind characteristics above rural and suburban areas |
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Hrvoje Kozmar
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| Abstract | ||
| A wind tunnel study has been carried out to determine the influence of spacing between buildings on wind characteristics above rural and suburban type of terrain. Experiments were performed for two types of buildings, three-floor family houses and five-floor apartment buildings. The atmospheric boundary layer (ABL) models were generated by means of the Counihan method using a castellated barrier wall, vortex generators and a fetch of roughness elements. A hot wire anemometry system was applied for measurement of mean velocity and velocity fluctuations. The mean velocity profiles are in good agreement with the power law for exponent values from ??=?0.15 to ??=?0.24, which is acceptable for the representation of the rural and suburban ABL, respectively. Effects of the spacing density among buildings on wind characteristics range from the ground up to 0.6?. As the spacing becomes smaller, the mean flow is slowed down, whilst, simultaneously, the turbulence intensity and absolute values of the Reynolds stress increase due to the increased friction between the surface and the air flow. This results in a higher ventilation efficiency as the increased retardation of horizontal flow simultaneously accompanies an intensified vertical transfer of momentum. | ||
| Key Words | ||
| wind characteristics; spacing between buildings; wind tunnel simulation. | ||
| Address | ||
| Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Ivana 5, HR-10000 Zagreb, Croatia Department of Civil Engineering and Geological Sciences, University of Notre Dame, Notre Dame, IN 46556, USA | ||