Structure overset grid method and its applications to simulation of multi-body separation

作     者：ZHANG HaiRui FAN JingJing YUAN Wu ZHANG WeiHua 

作者机构：College of Aerospace Science and Engineering National University of Defense Technology China Academy of Lanch Vehicle Technology Supercomputing Center Computer Network Information Center Chinese Academy of Sciences 

出 版 物：《Science China(Physics,Mechanics & Astronomy)》 (中国科学：物理学、力学、天文学（英文版）)

年 卷 期：2015年第58卷第9期

页      面：68-75页

核心收录：

学科分类：07[理学] 080103[工学-流体力学] 08[工学] 080104[工学-工程力学] 070102[理学-计算数学] 0701[理学-数学] 0801[工学-力学（可授工学、理学学位）] 

主　　题：dynamic overset grids multi-body separations CFD 

摘      要：This paper proposes an automatic structure overset grid method, which utilizes the hole-surface optimization with one-step searching, wall-surface grid oversetting, and dynamic overset grid approaches to achieve the high adaptability of overset grids for complex multi-body aircrafts. Specifically, based on the automatic structure overset grids, the method first solves the coupling of Navier-Stokes(N-S) unsteady flow equation and 6DOF motion equation, and establishes the multi-body collision model. Then, the numerical simulation of unsteady flow for complex aircrafts multi-body separation, the simulation of multi-body separating trajectory and the separation safety analysis are accomplished. Thus, the method can properly handle practical engineering problems including the wing/drop tank separation, aircraft/mount separation, and cluster bomb projection. Experiments show that our numerical results match well with experimental results, which demonstrates the effectiveness of our methods in solving the multi-body separation problem for aircrafts with complex shapes.