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给出了一种基于计算流体力学/计算结构力学(CFD/CSD)的双向流固耦合方法.通过交替数字二叉树(ADT)搜索技术识别流固网格之间的宿主-受体关系.采用局部插值算法完成两套网格系统之间的数据交换,并使用Delaunay图映射方法来完成气动网格的移动.将自编的非线性结构有限元程序、接口程序与南京航空航天大学(NUAA)微型飞行器中心的流体计算程序3D2MUFS相连接,应用于蜻蜓柔性翼拍动飞行的气动计算中.计算结果表明:柔性变形使得蜻蜓翼的时均举力系数从0.31提高到0.53,时均推力系数从0.07提高到0.13,证实了柔性变形能改善扑翼的气动性能.
A two-way fluid-structure interaction method based on Computational Fluid Dynamics / Computational Structural Mechanics (CFD / CSD) is presented, in which host-acceptor relationships are identified by alternating digital binary tree (ADT) The interpolation algorithm completes the data exchange between the two sets of grid systems and uses the Delaunay graph mapping method to complete the movement of the pneumatic grid.The finite element program and interface program of the nonlinear structure are compared with the NUAA miniaturization The fluid calculation program 3D2MUFS of the aircraft center is connected to the aerodynamic calculation of the flapping flight of the dragonfly flexible wing.The calculation results show that the flexural deformation increases the average lift coefficient of the dragonfly wing from 0.31 to 0.53 and the average thrust coefficient from 0.07 Increased to 0.13, confirmed that the flexible deformation can improve the aerodynamic performance of flapping wing.