基于非结构重叠网格的二维外挂物投放模拟

本文发展了基于非结构重叠网格的动态网格技术,并提出了新的相邻单元搜索算法。非结构重叠网格集非结构网格和重叠网格的优点于一身,适合处理复杂外形和多体相对运动问题。新的相邻单元搜索算法在碰到物面时能继续搜索下去,搜索效率大大提高。非定常Euler方程的求解,采用有限体积法,时间上采用双时间步长推进。为验证算法的有效性,先对绕振荡NACA0012翼形的流动进行了模拟;然后通过耦合求解刚体三自由度运动方程,模拟了二维外挂物投放过程,结果表明非结构重叠网格在处理多体相对问题时具有优越性。

2D store separation simulation using unstructured overlapping grid

A new dynamic grid algorithm based on unstructured overlapping grid is developed to simulate unsteady flows about objects in relative motion,and the proposed neighbor-to-neighbor algorithm is used to enhance the search efficiency.The unstructured overlapping grid approach has the advantages of unstructured grid and Chimera grid,so it is very suitable to handle problems with complex geometries and/or moving bodies.In this paper,the unsteady compressible Euler equations are solved on unstructured overset grid by an explicit dual time-stepping,finite volume,upwind method.To validate the algorithms,the flow past a pitching airfoil harmonically about the quarter chord is computed.Finally,the algorithm is used to simulate the store separation from a wing section.