Study on suitable method to simulate fluctuating wind pressurecharacteristics of standard high-rise building model based on LES

In order to improve the accuracy in simulations of the flow around bluff bodies, two new LES inflow turbulence generation methods, including the narrow band synthesis random flow generation (NSRFG) method and the consistent discrete random flow generation (CDRFG) method respectively, were adopted in the comparative study of the flow around the commonwealth advisory aeronautical research concil (CAARC) standard high-rise building model. The numerical verification work of the turbulent wind field for the atmospheric boundary layer (ABL) flow was conducted. Subsequently, the differences between the mean and fluctuating wind pressure coefficients, the turbulent flow characteristics, and the probability density distribution characteristics of the fluctuating wind pressure coefficients obtained by the two methods were analyzed by comparing with the wind tunnel test results. The non-Gaussian characteristics of the fluctuating wind pressure were addressed to verify their applicability and accuracy in simulating flow around bluff bodies. Results show that the fluctuating wind pressures obtained by the two methods on the windward side, which are directly affected by the incoming turbulent flow, both satisfy the Gaussian distribution. The NSRFG method reflects relatively better performance in simulating the non-Gaussian distribution for the fluctuating wind pressure on the lateral and leeward sides, which are more influenced by the separated and wake flow. To satisfy an insurance rate of 99.38%, analysis of peak wind pressure shows that the maximum and minimum peak factors on the windward side of the CAARC model should be taken as 3.0 and 2.5 respectively, while those values should be 2.5 and 4.0 on the lateral and leeward sides.