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Large Eddy Simulation of a Vortex Ring Impacting a Bump

Published online by Cambridge University Press:  03 June 2015

Heng Ren ,
Ning Zhao  and
Xi-Yun Lu
Heng Ren*
Affiliation:
Department of Modern Mechanics, University of Science and Technology of China, Hefei 230026, Anhui, China
Ning Zhao*
Affiliation:
Department of Aerodynamics, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, Jiangsu, China
Xi-Yun Lu*
Affiliation:
Department of Modern Mechanics, University of Science and Technology of China, Hefei 230026, Anhui, China
*
Email: renheng@mail.ustc.edu.cn
Email: zhaoam@nuaa.edu.cn
URL:http://staff.ustc.edu.cn/∼xlu/, Corresponding author. Email: xlu@ustc.edu.cn
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Abstract

A vortex ring impacting a three-dimensional bump is studied using large eddy simulation for a Reynolds number Re = 4 × 104 based on the initial diameter and translational speed of the vortex ring. The effects of bump height and vortex core thickness for thin and thick vortex rings on the vortical flow phenomena and the underlying physical mechanisms are investigated. Based on the analysis of the evolution of vortical structures, two typical kinds of vortical structures, i.e., the wrapping vortices and the hair-pin vortices, are identified and play an important role in the flow state evolution. The boundary vorticity flux is analyzed to reveal the mechanism of the vorticity generation on the bump surface. The circulation of the primary vortex ring reasonably elucidates some typical phases of flow evolution. Further, the analysis of turbulent kinetic energy reveals the transition from laminar to turbulent state. The results obtained in this study provide physical insight into the understanding of the mechanisms relevant to the flow evolution and the flow transition to turbulent state.

Keywords

76F6576D1776F06Large eddy simulationvortex ringvortical structureturbulent state
Type
Research Article
Information
Advances in Applied Mathematics and Mechanics , Volume 6 , Issue 3 , June 2014 , pp. 261 - 280
Copyright
Copyright © Global-Science Press 2014

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