The Topology of the Sectional Streamlines

作     者：Lixin GE and Qingdong CAI(Lab. Of Comp. Phys., IAPCM, P.O.Box 8009, Beijing 100088,China) 

作者机构：Lab. of Comp. Phys. IAPCM P.O.Box 8009 Beijing 100088 China 

出 版 物：《Communications in Nonlinear Science and Numerical Simulation》 (非线性科学与数值模拟通讯(英文版))

年 卷 期：1998年第3卷第4期

页      面：203-206页

核心收录：

学科分类：07[理学] 070104[理学-应用数学] 0701[理学-数学] 

基　　金：Trans-century training Program foundation for the Talent of SEDC National Natural Science Foundation of China, NSFC 

主　　题：: sectional streamline limit cycle focus 

摘      要：The unsteadyl three-dimensional full Navier-Stokes equations are solved using a Beam-Warming implicit algorithm in this paper. Computations of the flow over a 76°sweep delta wing at 36.5° angle of attack is presented. The sectional streamlines are depicted and the evolution of the instantaneous crossflow topology of the leading-edge vortex is analyzed. It is found that, along the axis, the topology of the primary vortex alters several times starting from stable focus near the apex to unstable focus, and lasts back to stable focus near wake edge; The stable limit cycle and unstable lint cycle are shown in this evolution. These various altering topologies stem from the stretching and compression of the vortex core.