| A NUMERICAL STUDY ON VORTEX RINGS WITH SWIRL |
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| 作者姓名： | Hu Guo hui Sun De jun Yin Xie yuan |
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| 作者单位： | Hu Guo hui，Sun De jun，Yin Xie yuan Department of Modern Mechanics，University of Science and Technology of China，Hefei 230026，China |
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| 基金项目： | TheProjectsupportedbytheNationalNaturalScienceFoundationofChina.(No :19772 0 5 2 ) |
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| 摘 要： | 1 . ＩＮＴＲＯＤＵＣＴＩＯＮＶｏｒｔｅｘｒｉｎｇｗｉｔｈｓｗｉｒｌ (ｉ.ｅ .ａｚｉｍｕｔｈａｌｆｌｏｗ)ａｒｅｏｆｇｒｅａｔｉｍｐｏｒｔａｎｃｅｆｏｒｔｈｅｓｔｕｄｙｏｆｖｏｒｔｅｘｍｏｔｉｏｎ .Ｍａｎｙｉｎｔｅｒｅｓｔｉｎｇｐｈｅｎｏｍｅｎａｒｅｌａｔｅｄｔｏｖｏｒｔｅｘｄｙｎａｍ ｉｃｓｃａｎｂｅｏｂｓｅｒｖｅｄｄｕｒｉｎｇｔｈｅｅｖｏｌｕｔｉｏｎｏｆｔｈｅｆｌｏｗｓ,ｓｕｃｈａｓｓｔｒｅｔｃｈｉｎｇ ,ｃｏｎｃｅｎｔｒａｔｉｏｎｏｒｒｅｏｒｉｅｎｔａｔｉｏｎｏｆｖｏｒｔｉｃｉｔｙ .Ａｌｔｈｏｕ…
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A NUMERICAL STUDY ON VORTEX RINGS WITH SWIRL |
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| Hu Guo hui,Sun De jun,Yin Xie yuan.A NUMERICAL STUDY ON VORTEX RINGS WITH SWIRL[J].Journal of Hydrodynamics,2001(2). |
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| Authors: | Hu Guo hui Sun De jun Yin Xie yuan |
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| Affiliation: | Hu Guo hui,Sun De jun,Yin Xie yuan Department of Modern Mechanics,University of Science and Technology of China,Hefei 230026,China |
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| Abstract: | 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. |
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| Keywords: | vortex ring with swirl leap frogging direct numerical simulation |
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