迎流角对尖端形宽幅悬浮隧道截面涡激振动特性的影响研究

Influence of the inflow angle on the vortex-induced vibration characteristics of the tip-shaped wide submerged floating tunnel section

摘要

尖端形截面是悬浮隧道管体一种有利于波流环境中流固耦合相互作用的多车道宽幅截面，其迎流角的大小与流体荷载值直接相关。为了获取迎流角与尖端形宽幅悬浮隧道截面涡振特性的内在联系，本研究设计了7种不同迎流角的尖端形宽幅截面。使用FLUENT软件建立了非定常流下的二维缩尺数值模型，采用二维雷诺时均（Reynolds Averaged Navier-Stokes，RANS）SST k-ω湍流模型求解不可压缩黏性流体N-S方程。将Runge-Kutta法代码嵌入FLUENT UDF中以求解结构振动响应，采用动网格技术将悬浮隧道简化为质量-弹簧-阻尼系统进行了数值模拟。研究了不同迎流角与自振频率的悬浮隧道在洋流作用下的振动响应、尾迹脱涡模式、运动轨迹。结果表明：1）结构的最大横向振幅随迎流角的增大而减小，阻力随迎流角的增大而增大，最大流向振幅随流速的增加而增加；2）悬浮隧道在水中限幅运动以横向往复振动为主，流向方向为偏离原有位置；3）80°的迎流角为尖端形截面综合考虑受力及空间利用率下的合适角度；4）结构自振频率的改变仅对升力影响较大，不会改变结构的脱涡模式。

Abstract

The tip-shaped section is a kind of multi-lane wide section of the submerged floating tunnel（SFT）tube that is conducive to the fluid-structure coupling interaction in the wave and current environments. Its inflow angle is directly related to the fluid load value. To obtain the intrinsic relationship between the inflow angle and the vortex-induced vibration characteristics of the tip-shaped wide SFT tube section，seven tip-shaped wide sections with different inflow angles were designed in this paper. A two-dimensional scaled numerical model under unsteady flow was established by using FLUENT software. The two-dimensional Reynolds Averaged Navier-Stokes（RANS）Shear Stress Transfer（SST）k-ω turbulence model was used to solve the N-S equation of incompressible viscous fluid. And the Runge-Kutta method code was embedded in FLUENT UDF to solve the structural vibration response. The dynamic mesh technique was used to simplify the SFT into a mass-spring-damping system for numerical simulation. The vibration responses，wake patterns and motion trajectories of the tip-shaped SFT structure with different inflow angles and different natural frequencies under the action of currents were studied. The results show that:1）The maximum transverse amplitude of the structure decreases with the increase of the inflow angle，the drag force grows with the increase of the inflow angle，and the maximum amplitude in flow direction increases with the increase of flow velocity. 2）The limited-amplitude motion of the SFT in water is dominated by lateral reciprocating vibration，and the vibration in flow direction deviates from the original position. 3）80° is an appropriate inflow angle for the tip-shaped section under comprehensive considering of force and space utilization efficiency. 4）The change in the natural frequency of the structure only has a significant impact on the lift force and does not change the vortex shedding mode of the structure.

关键词

悬浮隧道 / 尖端形宽幅截面 / 迎流角 / 涡激振动 / 数值模拟

Key words

submerged floating tunnel / tip-shaped wide cross-section / inflow angle / vortex-induced vibration（VIV） / numerical simulation

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基金资助

国家自然科学基金资助项目(52278139)

国家自然科学基金资助项目(52278141)

湖南省自然科学基金资助项目(2022JJ30612)

长沙市科技计划资助项目(kq2202204)