一种基于N-S方程的CFD/CSD耦合计算方法

CFD/CSD Couping Numerical Computational Method Based on N-S Equations

对于气动弹性问题,在跨音速和大变形情况下,模态叠加法失效,为此需要探讨全场求解耦合方程的新方法。利用耦合计算流体动力学和计算结构动力学(CFD/CSD)方法,数值模拟了机翼的气弹响应问题。气动力的求解采用三维Navier-Stokes方程的有限体积法,实现了一种多块结构网格的动网格方法生成气动网格,采用有限元方法计算应力和结构变形。设计了CFD/CSD耦合计算的数据交换的方式,采用CFD/CSD弱耦合技术发展了一种CFD/CSD耦合计算方法,并对三维机翼的静气动弹性进行了数值模拟。结果表明:这种耦合方法求解气动弹性问题是实用的,可以应用于实际的工程设计。

For the aeroelastical problems, the modal superpositon method would be invalid on the condition of subsonic and gross distortion. New method on coupling flow equations should be developed. The aeroelastical problem of wings is analyzed. Navier Stokes equations based on cell-centered finite volume discretization is used to obtain aerodynamic performance. To generate grids for CFD simulation, a multi-block, three-dimensional moving grid method is developed. Finite element equations are used to compute structural dynamics. Boundary information between the CFD and CSD codes is exchanged through the developed program. A coupling computational method of CFD and CSD is developed and a numerical simulation study of static aeroelastic for three-dimensional aircraft wing is carried out. The results show that using the developed CFD/CSD coupling procedure to solve aeroelastic problems is efficient and could be applied to the field of engineering design.