【摘要】 本文针对大跨度柔性屋盖风振中流固耦合作用的特点,介绍了一种计算黏性不可压缩流体与经历大变形非线性结构之间流固耦合作用的强耦合方法。本文将伪实体弹性模型引入到流固耦合问题的流体域中处理其变形,使流体和固体形成整体耦合,推导了计算流固耦合问题的整体式方程,并用Newton-Raphson法求解。文中首先用经典圆柱绕流证明了该方法的有效性,并利用该方法计算了一大跨度柔性屋盖风振的流固耦合问题,结果与已有文献中的结果符合良好。因此证明本文提出的强耦合方法用于计算大跨度柔性屋盖风振流固耦合问题是准确可行的。更多还原

【Abstract】 Aiming at characteristics of fluid-structure interaction in long-span flexible roof wind-induced vibration,this paper presents a full coupling method for calculating a viscous incompressible flow and a nonlinear structure undergoing large deformations.Pseudo-solid elastic model was introduced to manage the deformations of fluid domain in fluid-structure interaction problems,which is helpful to make simultaneaus coupling of fluid and solid.A general simultaneous equation for analyzing the fluid-structure interaction was derived and it was solved by using Newton-Raphson method.It was firstly applied to a cylinder placed in flow to validate the approach.Then it was applied to analyze the fluid-structure interaction in long-span flexible roof wind-induced vibration.The results are consistant with those in existing literatures.It proves that the proposed full coupling method for analyzing the fluid-structure interaction in long-span flexible roof wind-induced vibration is feasible and accurate.更多还原