用动态非结构重叠网格法模拟三维多体相对运动绕流

 发展了动态非结构重叠网格技术。本文提出了基于阵面推进的相邻单元搜索算法和适合于高阶空间离散格式的网格间插值关系定义方法，前者提高了非结构重叠网格在模拟多体间具有大幅相对运动的非定常问题时网格处理的效率，而后者保证了网格间边界附近流场求解精度；本文非定常Euler方程的求解采用有限体积法，通量计算采用Osher格式，时间积分采用双时间步长推进。为验证本文提出的方法，分别对定常M6机翼绕流和机翼下外挂物投放过程的非定常绕流进行了模拟,结果表明本文提出的方法提高了非结构重叠网格在模拟多体间具有大幅相对运动问题时的效率，保证了网格边界处的精度，具有较高的工程应用价值。

Simulation of Flows Past Multi-body in Relative Motion with Dynamic Unstructured Overset Grid Method

A new dynamic unstructured overset grid method is de ve loped.The neighbor-to-neighbor search algorithm based on advancing front is de veloped to enhance the searching efficiency.The redefinition of inter-grid boun dary satisfies high order spatial accuracy.Unsteady Euler equations are solved o n unstructured overset grid by an explicit dual time-stepping, finite volume, u pwind method.Numerical results show that the unstructured overset grid method ca n more conveniently simulate the problems of the unsteady or/and complex multi-body in relative motion.