Journal of Engineering Research

Square cross-section is one of the most common forms of building cross-section. It is necessary to analyze the flow characteristics and surface wind loads of square-section buildings. In this paper, four grid schemes are compared, and the mean drag coefficient, fluctuating lift coefficient, strouhal number and wind pressure distribution are determined based on the optimal scheme. The results show that when the dimensionless distance of the grid near the wall is less than 1, the accuracy of the large eddy simulation of the flow around a square building is satisfied. The average drag coefficient of the square building is 2.269, the fluctuating lift coefficient is 1.428, and the strouhal number is 0.131. The mean and fluctuating wind pressure coefficients of the building change abruptly at the corner of the windward surface. The mean wind pressure coefficient of the upwind face is positive, and the fluctuating wind pressure coefficient is the smallest; the mean wind pressure coefficient of the side elevation and the back elevation is negative, and the fluctuating wind pressure coefficient reaches the maximum value in the side elevation.

Square section building; Numerical simulation; Average drag coefficient; Fluctuating lift coefficient; Coefficient of wind pressure