A NUMERICAL STUDY ON VORTEX RINGS WITH SWIRL

作     者：Hu Guo hui, Sun De jun, Yin Xie yuan Department of Modern Mechanics, University of Science and Technology of China, Hefei 230026 , China 

出 版 物：《Journal of Hydrodynamics》 (水动力学研究与进展B辑（英文版）)

年 卷 期：2001年第13卷第2期

页      面：1-8页

核心收录：

学科分类：080704[工学-流体机械及工程] 080103[工学-流体力学] 08[工学] 0807[工学-动力工程及工程热物理] 0801[工学-力学（可授工学、理学学位）] 

基　　金：TheProjectsupportedbytheNationalNaturalScienceFoundationofChina.(No :19772 0 5 2 ) 

主　　题：vortex ring with swirl leap frogging direct numerical simulation 

摘      要：A finite difference scheme in cylindrical coordinates was used to study the three dimensional (3D) motion of a vortex ring with swirl and the passage interaction between two vortex rings. For the 3D evolution of a single thin ring, the azimuthal perturbation modes grow linearly in the early stage. According to their growth rates, two bands of growing waves, which correspond to the first and the second radial mode respectively, can be observed. The result is similar to the prediction of short wave instability theory for swirl free vortex rings. For the passage process between two rings, results show that the azimuthal velocity is in inverse proportion to radius while the azimuthal vorticity is in proportion to radius during the interaction.