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为研究山区路段横风对桥隧连接段上风场特性的影响,建立桥隧连接段三维模型,利用国际大型流体力学计算软件FLUENT,使用有限体积法进行空间离散,采用k-w湍流模型对桥梁上空不同位置处峡谷横风形成的风特性进行数值模拟计算。计算结果表明:在相同风速条件下,峡谷间距越小,对气流的加速作用越明显,而在桥梁上空呈现的加速区间却减小;当峡谷间距分别为20、30、50m时,桥梁上空的风速分别增加了30.8%、29.3%、27.2%,加速范围分别是16、20、38m。同时,表现出桥隧连接段离隧道一定范围内风速较小,但湍流强度较大;在桥梁中央一定范围内风速较大,但湍流强度较小。数值模拟结果为交通安全性和舒适性研究提供了可靠依据。
In order to study the influence of transverse wind in mountainous section on the wind field characteristics at the connecting section of bridge and tunnel, a three-dimensional model of connecting section of bridge and tunnel is established. The large-scale fluid mechanics software FLUENT is used to discretize the space using finite volume method. The wind characteristics of the formation of the cross canyon at the location are numerically simulated. The results show that under the same wind speed, the smaller the gully spacing is, the more obvious the accelerating effect is on the airflow, while the acceleration interval over the bridge decreases. When the gully spacing is 20, 30 and 50m respectively, Wind speed increased by 30.8%, 29.3% and 27.2% respectively, and the acceleration ranges were 16,20 and 38m respectively. At the same time, it shows that the connecting section of bridge and tunnel is less wind speed within a certain range of the tunnel, but the intensity of turbulence is larger. The wind speed is larger in a certain range in the center of the bridge, but the intensity of turbulence is smaller. Numerical simulation results provide a reliable basis for the study of traffic safety and comfort.