A nonlinear static aeroelastic methodology based on the coupled CFD/CSD approach has been developed to study the geometrical nonlinear aeroelastic behaviors of high-aspect-ratio or multi-material flexible aerial vehicles under aerodynamic loads. The Reynolds-averaged Navier–Stokes solver combined with the three-dimensional finite-element nonlinear solver is used to perform the fluid-structure coupling simulation. The interpolation technique for data transfer between the aerodynamic and structural modules employs radial basis function algorithm as well as dynamic mesh deformation. A high-aspect-ratio structure with multi-material is modeled by the finite element method to investigate the effects of geometrical nonlinearity on the aeroelastic behavior. Numerical simulations of the linear and nonlinear static aeroelasticity were conducted at transonic regime with different angles of attack. By comparing the aeroelastic behaviors of linear and nonlinear structure, it shows that geometrical nonlinearity plays an important role for flexible high-aspect-ratio wings undergoing the large static aeroelastic deformation and should be taken into account in aeroelastic analysis for such structures.

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几何非线性气动弹性的CFD/CSD数值分析

开发了一种基于耦合 CFD/CSD 方法的非线性静态气动弹性方法，用于研究气动载荷下高纵横比或多材料柔性飞行器的几何非线性气动弹性行为。使用雷诺平均 Navier-Stokes 求解器结合三维有限元非线性求解器进行流固耦合模拟。空气动力学和结构模块之间数据传输的插值技术采用径向基函数算法以及动态网格变形。通过有限元方法对具有多材料的高纵横比结构进行建模，以研究几何非线性对气动弹性行为的影响。线性和非线性静态气动弹性的数值模拟是在具有不同攻角的跨音速状态下进行的。通过比较线性和非线性结构的气动弹性行为，表明几何非线性对于承受大静态气动弹性变形的柔性大展弦比机翼起着重要作用，应在此类结构的气动弹性分析中加以考虑。