CAJ | 학술논문

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L ES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。
본문이용유한체적법리산비은태단류점성、불가압축적N-S방정급L ES단류모형，용유한원방법리산전열관결구，결합동망격공제기술，실현료류체-결구량개물리장지간적교호작용。기우수치모형，통과향응분지、상위각、Lissajou도、운동궤적、상도이급Poincare절면영사，분석료전열관재불동향응계단적운동행위화향응특성，이급승력계수여횡향위이적겁한배여분차등비선성특성。연구결과표명：전열관적류체유도진동계통존재일개의상단분지；재균균단류류동작용하，삼유탄성관적승력여횡향위이병미출현주기해적분차。
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 .