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利用雷诺时均N-S方程和SST K-ω湍流模型对雷诺数Re=6×104的二维方柱在风向角α=0°-45°下的绕流开展CFD模拟,获得方柱涡脱斯托哈数、平均和脉动风荷载随来流风向角的变化,模拟结果与文献吻合较好。研究结果表明:风向角α=10°-15°时,阻力系数平均值最小,斯托哈数最大;但随风向角的增大,前者大幅升高后者小幅回落。当风向角α≤15°时,风压系数平均值在0°最大,10°时最小;当风向角α>15°后,背面和上侧面风压系数平均值均大于0°风向角,下侧面均小于0°风向角,且随风向角的增大前者大幅升高而后者大幅降低。背面风压系数脉动值大于0°风向角而侧面小于0°风向角,且风向角越大,风压系数脉动值越大。本文研究揭示了方柱在全风向角下的风荷载变化规律。
Using the Reynolds-averaged Navier-Stokes equations and the SST K-ω turbulence model, the CFD simulation was performed on a two-dimensional square cylinder with Reynolds number Re = 6 × 104 at wind direction α = 0 ° -45 °, Tohka number, mean and fluctuating wind load with the wind direction angle changes, the simulation results agree well with the literature. The results show that: when the wind direction angle α = 10 ° -15 °, the average of the drag coefficient is the smallest and the Stojal number is the largest; but with the increase of the wind direction angle, the former slightly increases and the latter decreases slightly. When the wind direction angle is less than or equal to 15 °, the average value of the wind pressure coefficient is the largest at 0 ° and the minimum at 10 °. When the wind direction angle α> 15 °, the average wind pressure coefficient of the back and upper sides are greater than 0 °, Both sides are less than 0 ° wind direction angle, and with the increase of wind direction angle, the former increases sharply while the latter decreases drastically. The value of reverse air pressure coefficient pulsation value is greater than 0 ° wind direction angle and the side is less than 0 ° wind direction angle, and the larger the wind direction angle, the greater the wind pressure coefficient pulsation value. This study reveals the square column in the wind direction of the wind load variation.