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Article Information:
Numerical Study of a Vortex Ring Interacting with a Three-dimensional Convex Surface
Heng Ren, Genxuan Zhang, Hongshan Guan, Xianfeng Zhang and Wanjun Liu China
Corresponding Author: Heng Ren
Submitted: June 25, 2014
Accepted: August 26, 2014
Published: November 05, 2014 |
Abstract:
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A vortex ring impinging on a three-dimensional bump is studied using Large Eddy Simulation (LES) for a Reynolds number Re = 4×104 based on the initial diameter and translational speed of the vortex ring. The evolution of vortical structures are investigated and an array of flow phenomena are discovered, such as the generation and deformation of secondary vortex ring, formation of loop-like vortices, interaction of vortex rings and the instability and breakdown of vortical structures. The total enstrophy of the flow reasonably elucidates some typical phases of flow evolution. Based on the Fourier analysis of the vertical vorticity, the azimuthal instabilities of the primary vortex ring are studied. Furthermore, the mechanism of vorticity generation on the bump surface has been revealed based on analysis of the boundary vorticity flux.
Key words: Azimuthal instability, large eddy simulation, vortical structure, , , ,
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Cite this Reference:
Heng Ren, Genxuan Zhang, Hongshan Guan, Xianfeng Zhang and Wanjun Liu China, . Numerical Study of a Vortex Ring Interacting with a Three-dimensional Convex Surface. Research Journal of Applied Sciences, Engineering and Technology, (17): 1863-1869.
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ISSN (Online): 2040-7467
ISSN (Print): 2040-7459 |
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