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首页> 外文期刊>Journal of aerospace engineering >Fully Coupled Aeroelastic Analyses of Wing Flutter towards Application to Complex Aircraft Configurations
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Fully Coupled Aeroelastic Analyses of Wing Flutter towards Application to Complex Aircraft Configurations

机译：机翼扑振的完全耦合空气弹性分析朝向复杂的飞机配置

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Aeroelastic instabilities are some of the critical issues affecting the reliability and safety of military and commercial aircraft. In this study, a coupled computational fluid dynamics and computational structural dynamics (CFD-CSD) capability was developed for transonic aeroelasticity analysis in the time domain. To expedite application of the CFD solver for aeroelastic simulations, a morphing technique was developed for mesh deformation in CFD, eliminating successive calling for a grid generator. The CFD solution was then tightly coupled with CSD by a fully implicit method. The three-dimensional (3D) CSD solver is a finite element model solving 3D elasticity equations using second-order tetrahedron elements. The coupling between aerodynamic loads and elastic deflections is developed based on spline matrices using radial basis functions. The results from the coupled CFD-CSD simulations for a two-dimensional (2D) rigid airfoil and the 3D elastic AGARD 445.6 wing are in reasonable agreement with the experimental and computational data available in the public domain. Also, the results reported in this paper highlight the importance of viscous effects for Mach numbers at and above the transonic dip, thereby highlighting the necessity to use a Navier-Stokes-based CFD solution as opposed to Euler. It is shown that the use of 3D elasticity enables the consideration of complex aircraft configurations such as with underwing stores, which can then be coupled in aircraft flutter simulations and sensitivity studies.
机译：空气弹性稳定性是影响军用和商业飞机可靠性和安全性的关键问题。在该研究中，开发了一种耦合的计算流体动力学和计算结构动态（CFD-CSD）能力用于时域中的肿块空气弹性分析。为了加快申请CFD求解器进行空气弹性模拟，开发了一种变形技术，用于CFD中的网格变形，消除了栅格发生器的连续呼叫。然后通过完全隐含的方法将CFD溶液与CSD紧密耦合。三维（3D）CSD求解器是一种使用二阶四面体元件求解3D弹性方程的有限元模型。基于使用径向基函数的花键矩阵开发了空气动力载荷和弹性偏转之间的耦合。用于二维（2D）刚性翼型和3D弹性agard 445.6机翼的耦合CFD-CSD模拟的结果与公共领域中可用的实验和计算数据合理一致。此外，本文报道的结果突出了跨音浸出和高于跨音浸出的马赫数的粘性效应的重要性，从而突出了使用基于Navier-Stokes的CFD解决方案而不是欧拉的必要性。结果表明，使用3D弹性使得能够考虑复杂的飞机配置，例如通过覆盖物品，然后可以在飞机颤动模拟和灵敏度研究中耦合。

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