基于CFD/CSD/CAA耦合的声气动弹性仿真技术在壁板颤振中的应用

提出了一种基于计算空气动力学/计算结构动力学/计算气动声学（CFD/CSD/CAA）耦合的声气动弹性时域仿真方法。空气动力学和气动声学分别采用大涡模拟和Lighthill声比拟理论进行计算。采用D’Alembert原理和有限元方法建立了二维简支壁板在超声速流作用下的非线性动力学方程，并在时域内进行求解。其中几何非线性采用Von Karman大变形理论描述。以二维弹性壁板作为研究对象，研究了超音速流场中噪声、气动力、和壁板之间的相互作用所产生的非线性颤振现象。

Application of aeroelastic-acoustics simulation technique based on CFD/CSD/CAA coupling in panel flutter

A type of aeroelastic-acoustics time-domain simulation technique based on computational fluid dynamics/computational structural dynamics/computational aeroacoustics （CFD/CSD/CAA） coupling is founded in this thesis. The large eddy model and the Lighthill acoustic analogy theory are used to Aerodynamics and Aeroacoustics respectively. The nonlinear dynamic equation of a simple supported two-dimensional panel in the supersonic flow are established through the D′Alembert principle and finite element method, and solved in time domain. In this equation, the geometric nonlinear is expressed by Von Kerman’s large deflection theory. With a two-dimensional elastic panel as the study object, this thesis investigated the nonlinear phenomenon of the flutter dues to the interaction of aerodynamic noise, aerodynamic force and panel in the supersonic flow.