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Numerical simulations of steady flow over a circular cylinder near a boundary

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Abstract

A well-developed numerical scheme is used to simulate the steady current over a circular cylinder in proximity with a rigid plane at low Reynolds numbers. The numerical results, including the hydrodynamic forces acting on the cylinder and the flow fields, are obtained and discussed. The reduction of the vorticity generated at the cylinder surface of the gap side is attributed to the decrease of the amplitude of harmonic force components and eventually causes the complete suppression of the vortex shedding process. Particularly, a distinct flow scenario characterized by the agglomeration of two adjacent vortices takes place in the wake when the cylinder is positioned close to the free-slip wall just before the complete cessation of the vortex shedding. This finding might be served to explain the disappearance of regularly arranged vortices observed when the cylinder was towed above the stationary wall in the experiment. In contrast, the flow with a no-slip plane is also considered. The effective gap between the cylinder and the plane is reduced due to the presence of the boundary layer near the plane, and earlier cessation of vortex shedding is observed in comparison with that in the situations of free-slip plane.

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Authors and Affiliations

  1. Ocean College, Zhejiang University, Zhoushan Campus, Zhoushan, 316021, People’s Republic of China

    Linwei Shen & Yan Wei

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  1. Linwei Shen
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  2. Yan Wei
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Correspondence to Yan Wei.

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Shen, L., Wei, Y. Numerical simulations of steady flow over a circular cylinder near a boundary. J Mar Sci Technol 23, 679–695 (2018). https://doi.org/10.1007/s00773-017-0503-5

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  • DOI: https://doi.org/10.1007/s00773-017-0503-5

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