基于CFD技术的流场/结构时域耦合求解方法研究  

Study of time-marching method for fluid/structure coupling solution based on CFD technique

作　　者：蒋跃文[1] 张伟伟[1] 叶正寅[1] 

机构地区：[1]西北工业大学翼型叶栅空气动力学国防科技重点实验室,陕西西安710072

出　　处：《振动工程学报》2007年第4期396-400,共5页Journal of Vibration Engineering

基　　金：国家自然科学基金重点资助项目(10432040);航空科学基金资助项目(04A53006)

摘　　要：针对流场/结构耦合方程,基于Adams隐式方法发展了一种杂交的线性多步法(HLMS),广义气动力项采用插值求解,结构项仍采用隐式格式计算,融合了显式方法耦合简单和隐式方法稳定性好的特点。该时域耦合迭代格式使用预估-校正法进行时间推进,仅需在预估步调用一次流场求解器,校正步的广义气动力项采用插值求解。算例运用非定常Euler方程计算了一个标准气动弹性模型(Isogai Wing)的颤振结果,并与几种经典的时域模拟方法进行了比较,证明该方法具有效率高、稳定性好、精度高的优点。A hybrid linear multi-step scheme（HLMS） based on the Adams implicit method is developed for the aeroelastic governing equation. The structural part is solved implicitly while the general aerodynamic part is solved explicitly, instead of calling the solvers of flow field. A predictor-corrector approach for aeroelastic time-marching is formed, in which the Adams explicit method is used for the predictor step. The calculation of the flow field is only performed in the predictor step during the whole iterative procedure. The accuracy and stability of the present method are almost the same as the Adams predictor-corrector procedure while keeping the characteristics of Adams explicit method for the high efficiency and convenience. Thus the existent solvers of flow field and structure can be modularized and employed to solve the aeroelastic problems directly. The transonic response of an aeroelastic model （Isogai wing） is calculated, in which the unsteady loads are computed by Euler codes. The present method is compared with several classic time-domain simulation methods. The results clearly validate its precision, stability and efficiency.

关 键 词：气动弹性 颤振 时域模拟 线性多步 杂交的线性多步法 

分 类 号：V211[航空宇航科学与技术—航空宇航推进理论与工程]