一种高效的CFD/CSD耦合飞行器多学科优化设计方法

An efficient method for multidisciplinary design optimization of aircraft based on CFD/CSD coupling

建立了一种基于CFD/CSD(computational fluid dynamics/computational structure dynamics)耦合的多学科优化设计方法.该方法采用结构有限元方程进行结构特性分析,同时采用数值求解N-S方程方法获得气动载荷,保证了设计结果的可信性,并采用基于代理模型的优化设计方法解决了采用高精度模型后计算量太大的问题.采用RBF(径向基函数)插值方法进行流固耦合界面数据插值,保证了传递过程中的能量守恒.利用建立的优化设计方法对一典型的翼身组合体进行了气动和结构优化设计,算例表明在满足约束条件的前提下优化后阻力和质量分别减小了5.0%和4.2%,证明了该方法的有效性.

A multidisciplinary design optimization method based on CFD/CSD（computational fluid dynamics/computational structure dynamics）coupling was built.The structural performance was predicted by the structural finite element equation,and the aerodynamic loads was predicted by solving N-S equations to get reliable optimization results.Surrogate model was adopted to alleviate the huge expense caused by high-fidelity models.RBF（radial basis function）was utilized to exchange data between fluid and structure,and energy conservation principle is guaranteed.Typical wing-body configuration was optimized by the proposed design optimization method to improve the aerodynamic and structural performance.After optimization,the drag and mass of the aircraft are reduced by 5.0% and 4.2%,respectively,and all the constraints are satisfied.All these indicate the effectiveness of the proposed method.