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Suction force and multiple frequencies subjected to oscillating cylinder on water surface

Suction force and multiple frequencies subjected to oscillating cylinder on water surface
Suction force and multiple frequencies subjected to oscillating cylinder on water surface
The flow field characteristics of modulation instability were widely investigated by many researchers. In marine and offshore engineering involved hydrodynamics, engineers generally care about the forces and then the motions of the structures. In this paper, numerical simulation is presented to investigate the modulation instability due to the forced oscillating cylinder on the water surface and then the force characteristics is focused on and analyzed. The numerical results show that the lift coefficients would be negative with minimum values, which mean that the suction forces would be presented, when the nondimensional parameter is ac >1. However, the lift coefficients would be always positive with ac <1. A constant which is the multiplication of various ac and reciprocal of the averaged lift coefficients is obtained in all cases regardless of the value ac. The motion of the cylinder is monochrome, but the lift force coefficient is not monochrome but with multiple frequencies, which is analyzed using Fast Fourier Transform (FFT).
Suction force, numerical simulation, oscillating cylinder, multiple frequencies
1098-6189
133-137
Jiang, Zhaobing
dd93405c-2674-48b4-8ae6-5ead9c2b06dc
Tan, Mingyi
4d02e6ad-7915-491c-99cc-a1c85348267c
Ma, Shan
0bde30f3-0d85-460b-961c-2f4c2b9ad068
Jiang, Zhaobing
dd93405c-2674-48b4-8ae6-5ead9c2b06dc
Tan, Mingyi
4d02e6ad-7915-491c-99cc-a1c85348267c
Ma, Shan
0bde30f3-0d85-460b-961c-2f4c2b9ad068

Jiang, Zhaobing, Tan, Mingyi and Ma, Shan (2017) Suction force and multiple frequencies subjected to oscillating cylinder on water surface. In Proceedings of the Twenty-seventh (2017) International Ocean and Polar Engineering Conference. pp. 133-137 .

Record type: Conference or Workshop Item (Paper)

Abstract

The flow field characteristics of modulation instability were widely investigated by many researchers. In marine and offshore engineering involved hydrodynamics, engineers generally care about the forces and then the motions of the structures. In this paper, numerical simulation is presented to investigate the modulation instability due to the forced oscillating cylinder on the water surface and then the force characteristics is focused on and analyzed. The numerical results show that the lift coefficients would be negative with minimum values, which mean that the suction forces would be presented, when the nondimensional parameter is ac >1. However, the lift coefficients would be always positive with ac <1. A constant which is the multiplication of various ac and reciprocal of the averaged lift coefficients is obtained in all cases regardless of the value ac. The motion of the cylinder is monochrome, but the lift force coefficient is not monochrome but with multiple frequencies, which is analyzed using Fast Fourier Transform (FFT).

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More information

Published date: 27 June 2017
Keywords: Suction force, numerical simulation, oscillating cylinder, multiple frequencies

Identifiers

Local EPrints ID: 412583
URI: http://eprints.soton.ac.uk/id/eprint/412583
ISSN: 1098-6189
PURE UUID: 3b529b1f-24f1-4f84-aea5-bee44a4fbaef

Catalogue record

Date deposited: 24 Jul 2017 16:31
Last modified: 13 Mar 2019 19:37

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Contributors

Author: Zhaobing Jiang
Author: Mingyi Tan
Author: Shan Ma

University divisions

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