摘要
本文利用有限体积法离散非稳态湍流黏性、不可压缩的N-S方程及LES湍流模型,用有限元方法离散传热管结构,结合动网格控制技术,实现了流体-结构两个物理场之间的交互作用。基于数值模型,通过响应分支、相位角、Lissajou图、运动轨迹、相图以及Poincare截面映射,分析了传热管在不同响应阶段的运动行为和响应特性,以及升力系数与横向位移的极限环与分叉等非线性特性。研究结果表明:传热管的流体诱导振动系统存在一个拟上端分支;在均匀湍流流动作用下,三维弹性管的升力与横向位移并未出现周期解的分叉。
The model presents a fully coupled approach with solving the fluid flow and the structure vibration simultaneously . The three-dimensional unsteady , viscous , incompressible Navier-Stokes equation and LES turbulence model were solved by the finite volume approach and the heat transfer structure was solved by finite element method combined with moving mesh control technique . The dynamic equilibrium equation was discretized according to the finite element theory and the mesh update was achieved by the dynamic mesh technology .Based on this model ,flow induced vibration responses of the tube were thus investigated using response branch , phase angle , Lissajou diagram ,trajectory ,phase portrait and Poincare section mapping .Meanwhile , the limit cycle and bifurcation of lift coefficient and lateral displacement were analyzed . T he results reveal that a quasi-upper branch is found in the fluid-structure interaction system ,and there is no bifurcation of lift coefficient and lateral displacement occurred in three-dimensional flexible tube submitted to uniform turbulent flow .
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
2014年第10期1807-1813,共7页
Atomic Energy Science and Technology
