A study on three-dimensional wind field characteristics of a complex hill

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (4) : 75-80.

SHEN Guohui1，WENG Wentao1，WANG Yiwen2，CHEN Jianfei2

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Abstract

In order to investigate three-dimensional wind field characteristics of a complex hill, a wind tunnel testing method using a Cobra probe was employed.The distribution characteristics of horizontal speed-up ratios and vertical velocity proportions under various wind azimuths were analyzed.The wind speed-up ratios under typical wind azimuths were compared with those regulated in various countries' Codes.Finally, a design proposal to three-dimensional wind field of a complex hill was suggested.Results show that a significant horizontal speed-up effect can be found at the top of the hill under all wind directions.A relatively significant horizontal speed-up effect can be found on the slope and at the foot of the hill in the crosswind direction.The wind tunnel test results are very close to those regulated in the American Code, while the data regulated in the Chinese Code is the most conservative.The maximum vertical wind speed occurs on the slope of hill, where the upward vertical velocity takes place in the windward direction and downward vertical velocity takes place in the leeward direction.The horizontal wind velocity regulated in the Codes is only referred in the windward situation, while the horizontal speed-up effect in all wind directions cannot be considered, especially in the crosswind direction.A wind tunnel testing method is recommended to obtain three-dimensional wind field characteristics for important constructions built on a complex hill.

Key words

wind tunnel test / wind velocity / hilly terrain / speed-up effect / vertical velocity

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SHEN Guohui1，WENG Wentao1，WANG Yiwen2，CHEN Jianfei2. A study on three-dimensional wind field characteristics of a complex hill[J]. Journal of Vibration and Shock, 2020, 39(4): 75-80

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