Numerical simulation of wind-induced mean and peak pressures around a low-rise structure
DongHun Yeo, Robert H. Ong, Luca Patruno, Yaping He, Kenny C. Kwok
We performed Computational Fluid Dynamics (CFD) analysis of the low-rise buildings immersed in a turbulent boundary layer. The Silsoe 6 m cube was chosen as the main case study in representing the key features of the typical wind conditions experienced by low-rise buildings. The turbulent inﬂow condition is generated by employing a precursor technique. A sensitivity study is conducted to investigate the eﬀects of eight subgrid-scale (SGS) models on the ﬂow around the cube. The incoming turbulence intensity and mesh reﬁnements for each of the SGS models are also explored. The results in terms of time-averaged pressure ﬁelds for relatively well-resolved simulations are well compliant with available experimental data and insensitive to the selection of SGS model. We demonstrate that while the eﬀect of the aforementioned factors has a limited impact on the ﬁrst-order statistics of the pressure coeﬃcients, their inﬂuence becomes much more pronounced when analysing higher-order statistics (i.e. variance, skewness and kurtosis) and extreme values. The extent of their relative importance depends on the location of the point under investigation and the quantity of interest. The current study provides guidelines on the choice of factors which can strongly aﬀect the results obtained employing CFD simulations when the local peak pressure ﬁeld quantities are of interest, for example, in the case of cladding design.