曲线公路隧道交通风力非稳态模拟研究

Unsteady simulation analyses of the traffic force in curvy highway tunnel

为分析小半径曲线隧道对交通风力的影响,采用移动网格和滑移交界面技术对半径600 m的曲线隧道和直线隧道进行三维非稳态数值计算。结果表明,采用动网格技术进行直线隧道交通风力计算结果与实验吻合;曲线隧道中,隧道断面风速分布表现出极不对称性,外侧风速较大,内侧较小;曲线隧道交通风力较直线隧道明显增大,汽车内车道行驶交通风力大于外车道行驶;曲线隧道中,汽车头部侧面出现了负压峰值,与直线隧道相比,该值较低,车身侧面压力沿纵向逐渐增大,汽车尾部背风面存在较低的负压区。

To analyze the traffic ventilation force by passing vehicle in curvy tunnel of small radius, The three-dimensional unsteady numerical analysis using the moving mesh and the sliding interface methods was carried out for the curvy tunnel（R=600 m） and the straight tunnel. The results shows that the numerical model result for the straight tunnel with moving mesh method is agree with the experimental data. The velocity distribution of the section is dissymmetrical in the curvy tunnel. The outer velocity of the section is higher and the inner velocity is lower. The traffic ventilation force of curvy tunnel is obviously greater than that of the straight tunnel and the force of the bus running on the inner line is bigger than that of the bus running on the outer. In the curvy tunnel, the peak of the low pressure places on the side surface of the head, compared with that of straight tunnel, it is lower, the pressure increases longitudinally. The lower pressure also places on the leeward surface of the back.