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首页> 外文期刊>Journal of Fluids and Structures >Computation of unsteady viscous flow around a locally flexible airfoil at low Reynolds number
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Computation of unsteady viscous flow around a locally flexible airfoil at low Reynolds number

机译：低雷诺数下局部柔性翼型周围非稳定粘性流的计算

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摘要

A numerical method for fluid-structure interaction is presented for the analysis of unsteady viscous flow over a locally flexible airfoil. The Navier-Stokes equations are solved by ALE-CBS algorithm, coupling with a structural solver with large deformation. Following the validation of the method, a numerical example for the flight of micro-air vehicles at low Reynolds number is chosen for the computation. The coupling effect of flexible structure with different elastic stiffness on aerodynamic performance is demonstrated. A noticeable camber effect is induced by the deflection of the structure as the elastic stiffness of the structure goes smaller. Moreover, when the vibrating frequencies of the structure with smaller elastic stiffness have a close correlation with the shedding frequencies, the positive impact of the vibration of local flexible surface on the lift of the airfoil is highlighted, which results from the formation of the coherent vortices.
机译：提出了一种流体-结构相互作用的数值方法，用于分析局部柔性翼型上的非稳态粘性流。 Navier-Stokes方程通过ALE-CBS算法求解，并结合了具有大变形的结构求解器。在方法验证之后，选择了一个低雷诺数微型飞机飞行的数值示例进行计算。证明了具有不同弹性刚度的柔性结构对空气动力性能的耦合作用。随着结构的弹性刚度变小，结构的变形会引起明显的外倾效应。此外，当具有较小弹性刚度的结构的振动频率与脱落频率密切相关时，局部挠性表面的振动对翼型升力的积极影响就突出了，这是由于形成了相干的涡流。

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