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

• Published in: Science China. Physics, mechanics & astronomy mechanics & astronomy, 2015-09, Vol.58 (9), p.68-75, Article 594702
• Main Authors: Zhang, HaiRui, Fan, JingJing, Yuan, Wu, Zhang, WeiHua
• Format: Article
• Language: English
• Subjects: Adaptability; Aircraft; Aircraft accidents; Astronomy; Automation; Classical and Continuum Physics; Computer simulation; Equations of motion; Flow equations; Grid method; Mathematical models; Multibody systems; Navier-Stokes equations; Observations and Techniques; Physics; Physics and Astronomy; Separation; Simulation; Unsteady flow; 仿真; 多体分离; 嵌套网格; 应用; 结构; 网格方法; 表面优化; 非定常流动
• ISSN: 1674-7348; 1869-1927
• DOI: 10.1007/s11433-015-5689-0

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.