基于CFD和CSM耦合的通用静气弹分析方法

提出了一种适用于有限元精细化建模的流固耦合插值点选择方法,通过RBF(径向基函数)方法实现流固耦合面的数据交换,实现了基于CFD/CSM(computational fluid dynamics/computational structural mechanics)耦合的通用非线性静气弹分析方法。以HIRENASD(high Reynolds number aero-structural dynamics)风洞试验模型为验证对象,数值结果很好地与风洞试验结构变形、气动压力分布吻合,验证了所发展非线性CFD/CSM耦合静气弹求解器的精度。详细研究了HIRENASD模型在大迎角(AOA)流动下的静气动弹性特性,以及该模型弹性变形对机翼气动特性影响规律。研究表明:HIRENASD弹性模型变形后其升力小于刚性模型；在小迎角范围内刚性、弹性模型升力差随迎角增大呈线性增长；当迎角大于4°后,升力差先减小后基本保持不变,呈非线性关系。 

General static aeroelasticity analysis method based on CFD/CSM coupling

A fluid-structural interpolate points selection method suitable for finite element refined modeling was proposed. RBF (radial basis function) method was applied for the data exchange between fluid-structural coupling surface. And then a nonlinear computational static aeroelastic approach based on CFD/CSM (computational fluid dynamics/computational structural mechanics) coupling method was developed. A HIRENASD (high Reynolds number aero-structural dynamics) wind-tunnel model was investigated. The good agreement of the structural deformation and surface aerodynamic pressure distribution between numerical results and experiment data validated the accuracy of the CFD/CSM solver developed. The static aeroelastic characteristics and elastic deformation effects of HIRENASD model in high AOA (angle of attack) were studied. Result showed that, the lift of HIRENASD elastic model was less than the rigid model; in small AOA region, the lift difference between rigid and elastic model linearly increased with the increase of AOA. When the AOA was greater than 4 degree, the difference decreased with AOA increase firstly, then the difference remained unchanged with the AOA increase, showing a complicated nonlinear relationship.