Analysis on Non-Gaussian Features of Fluctuating Wind Pressure on Square Tall Buildings

Abstract:

The non-Gaussian features of fluctuating wind pressures on square tall building are studied by using multi-channel measurement wind tunnel tests. The skewness, kurtosis and probability density function of fluctuating wind pressures are employed to obtain a description and measurement of the non-Gaussian features of the tall building firstly, then the non-Gaussian features of fluctuating wind pressures are analyzed, finally the regions with non-Gaussian feature under different wind angles are given. The results show that wind angle is important for the non-Gaussian features of the building. For the faces which wind directly impinged on, the positive and negative skewness appears simultaneously and the kurtosis is relatively small, so the Gaussian regions are major. However, for those associated with separated and wake flows, the negative skewness covers the whole face and the kurtosis is relatively large, so the non-Gaussian regions are major. As the reattachment happens, the negative skewness will increase and the kurtosis will decrease in the reattachment zones, as a result, non-Gaussian zones transition to Gaussian zones.