Numerical study of a twin box bridge deck with increasing gap ratio by using RANS and LES approaches
Numerical study of a twin box bridge deck with increasing gap ratio by using RANS and LES approaches
复制标题
DOI：
10.1016/j.engstruct.2015.05.017
复制
发表时间：
2015-09
影响因子：
5.5
通讯作者：
S. Miranda;L. Patruno;M. Ricci;F. Ubertini
中科院分区：
文献类型：
--
作者：
S. Miranda;L. Patruno;M. Ricci;F. Ubertini
双箱形桥面板由于其良好的气动性能，在大跨度桥梁中越来越多地被采用。对于甲板之间的小间隙，它们表现为一个完整的连续体，同时，增加差距，两者之间发生强烈的动态相互作用：迎风甲板引起湍流尾流，该尾流冲击背风梁，引起非定常气动力。从计算流体动力学的角度来看，这种复杂的行为使得这些结构的空气动力学模拟成为一项具有挑战性的任务。在这种情况下，本文件的目的是调查的能力和局限性RANS和LES为基础的模拟再现周围的双箱甲板部分的流场组织。不同的配置，随着分离间隙的增加，进行了研究，并与实验数据进行了比较。最后，障碍的存在所引起的影响进行了研究，为最大的分离间隙。
Twin box decks are becoming increasingly adopted in long span bridges due to their good aerodynamic performance with respect to the flutter instability. For small gaps between the decks they behave as a whole continuous body while, increasing the gap, strong dynamic interaction between the two occurs: the windward deck causes a turbulent wake that impinges on the leeward girder inducing unsteady aerodynamic forces. This complex behaviour makes the simulation of the aerodynamics of these structures a challenging task from the Computational Fluid Dynamic point of view. In this context, the present paper aims at investigating the capabilities and limitations of RANS and LES based simulations in reproducing the flow field organization around a twin box deck section. Different configurations, with increasing separation gap, are studied and compared with experimental data. Finally, the effects induced by the presence of barriers is investigated for the largest separation gap.