膜结构风振响应的二维数值模拟研究

结合膜结构的风振响应特点,采用流固耦合问题数值计算方法,实现了二维情况下膜结构风场的数值模拟。阐述了膜结构流固耦合计算中的结构域与流体域的网格关系和流固耦合边界的控制条件。选择大涡模拟作为湍流模型,并采用隐式时间积分TR-BDF法对流体域的Navier-Stokes方程进行时间域的离散。对耦合系统的有限元方程组采用Newton-Raphson法进行求解。计算结果表明,湍流模型选择大涡模拟可以较好模拟二维情况下膜结构在流场中的脉动反应。对于一般性的算例,瞬态流场中膜的应力增加较为明显。合理选择膜结构体型可以减小膜结构风振响应的脉动幅度。

Numerical simulation on wind-induced vibration of membrane structures in two dimensions

A numerical simulation approach for wind-induced response analysis of membrane structures in two dimensions is accomplished with recent international computation techniques.It is expatiated for the mesh algorithm between fluid domain and structure domain of membrane structures in two dimensions.At the same time the governing equations on fluid-structure interaction is presented.The large eddy simulation(LES) is used for turbulence simulation.With one implicit integration method: TR-BDF,the transient terms in the governing equations is solved.The direct solution procedure is used for solving the coupled system and the FEM equations are solved with Newton-Raphson method.With the solution results,the pulsant response of membrane structures in fluid domain can be simulated well using the LES.For some certain examples,the stress of membrane structures in wind loads increases largely.With proper shape of membrane structures,the pulsant response can be reduced to some extent.