膜结构风振中流固耦合效应的数值模拟研究

Numerical simulation of fluid-structure interaction in wind-induced vibration of membrane structures

对膜结构风致振动中的流固耦合效应进行了数值模拟研究。采用数值模拟方法中的强耦合整体方法,引入伪实体模型,通过伪实体模型方程,流体方程与结构方程的隐式弱形式来构成整个体系的强耦和整体式方程。采用该方法对双坡型膜结构在考虑和不考虑耦合效应下的风振响应等重要参数进行了计算分析,并将计算结果与已有风洞试验结果进行对比,结果符合良好。同时计算了结构周围空气的风速矢量、压力场分布,得到了空气流体场的变化规律。结果表明采用强耦合整体方法计算所得的解具有很好的收敛性,可以较准确地预测膜结构的风致动力响应。

The fluid-structure interaction in the wind-induced vibration of membrane structures is studied by using numerical simulation. The simultaneous strong coupled method is proposed by introducing the pseudo-solid model. The simultaneous strong coupled formulation of the system is achieved through the implicit weak form of fluid formulation, structural formulation and pseudo-solid formulation. The method is applied to study the key parameters such as wind-induced responses of double-slope and membrane structures, when considering and not considering the interaction effects. And the results are compared with those obtained in wind tunnel experiment. Meanwhile, the wind velocity and the pressure field distribution around membrane structures are calculated, and the changing rules of air flow are obtained. Solutions obtained by using the simultaneous strong coupled method has good convergence. The simultaneous strong coupled method can accurately predict the wind-induced dynamic responses of the membrane structures.