气动弹性及并行化求解研究

Investigation of the Aeroelasticity Problem and it's Parallel Computing

使用流固数值计算程序代码耦合的方法,将CFD与CSD耦合研究气动弹性的颤振现象。非定常气动力的CFD解法是基于非结构动网格上的ALE描述的三维Euler方程的有限体积法,结构颤振的CSD解法是基于有限元的线性模式叠加原理的机翼三维振动方程的求解。对用于非结构运动网格生成的标准弹簧近似方法进行了改进,提高了网格变形能力和网格质量。在CFD求解中,使用MPI并行编程方法进行了网格区域分解并行化计算。针对AGARD445.6机翼的案例,进行了试验与计算数据之间的比对,并在运行中通过并行化编程,对耦合解算器的加速比以及并行效率进行了研究。

In this paper, a code-coupling approach is presented for solution of aero-elastics problems. It coupled the CFD program and CSD program together to study the vibration and flutter phenomena. The unsteady CFD solution is the finite volume method of the 3D Euler equations that is described by ALE. The CSD solution is the 3D vibration equations which are based on linear mode-superposition algorithm. Specially, the standard spring analogy method is been studied for dynamic unstructured grids. The deforming ability and the quality of the dynamic grids are improved. The CFD grids domain is subdivided into sub domains for parallel computation. And the program is carried out by MPI parallel computation standards. The AGARD 445. 6 wing is studied here for comparisons with experiments and investigation results.