CAJ | 학술논문

为研究管束结构的流致振动问题，利用有限体积法离散大涡模拟的流体控制方程及有限元方法离散结构动力学方程，结合动网格技术，建立了正方形顺排排列弹性管束流固耦合系统的三维数值模型，并研究了不同弹性管束模型的流体力及振动响应特性。结果表明，管束结构的排列方式对流体力及动力学响应有很大的影响，5管模型能基本反映弹性管束的振动特性，而单管模型预测的临界速度较大，却可定性反映节径比为1.5正方形管束的流致振动特性。
위연구관속결구적류치진동문제，이용유한체적법리산대와모의적류체공제방정급유한원방법리산결구동역학방정，결합동망격기술，건립료정방형순배배렬탄성관속류고우합계통적삼유수치모형，병연구료불동탄성관속모형적류체력급진동향응특성。결과표명，관속결구적배렬방식대류체력급동역학향응유흔대적영향，5관모형능기본반영탄성관속적진동특성，이단관모형예측적림계속도교대，각가정성반영절경비위1.5정방형관속적류치진동특성。
In order to investigate the flow induced vibration problems in tube bundles ,a numerical model for fluid‐structure interaction system of an in‐line square tube bundle was presented .The unsteady three‐dimensional Navier‐Stokes equation and LES turbu‐lence model were solved with finite volume approach on structured grids combined with the technique of dynamic mesh . The dynamic equilibrium equation was discretized according to the finite element theory ,and the properties of fluid force and responses for various elastic tube models were studied by several calculations .The results show that tube configurations have an important effect on fluid force and dynamics respond .T he 5‐tube model can basically represent a flexible tube bundle .T he critical velocity predic‐ted by single tube model is larger than that predicted by flexible tube bundle .Besides ,it show s good qualitative agreement on flow induced vibration behaviors of square bundle with a pitch‐to‐diameter ratio of 1.5 .