On hydrodynamic characteristics of gap resonance between two fixed bodies in close proximity

Junliang Gao; Jun Zang; Lifen Chen; Qiang Chen; Haoyu Ding; Yingyi Liu

doi:10.1016/j.oceaneng.2018.12.052

On hydrodynamic characteristics of gap resonance between two fixed bodies in close proximity

Junliang Gao, Jun Zang, Lifen Chen, Qiang Chen, Haoyu Ding, Yingyi Liu

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Abstract

The resonant water motion inside a narrow gap between two identical fixed boxes that are in side-by-side configuration is investigated using a two-dimensional (2D) numerical wave tank based on OpenFOAM^®, an open source CFD package. Gap resonance is excited by regular waves with various wave heights, ranging from linear waves to strong nonlinear waves. This paper mainly focuses on the harmonic analyses of the free-surface elevation in the narrow gap and wave loads (including the horizontal wave forces, the vertical wave forces and the moments) on the bodies. It is found that the influences of the incident wave height on the higher-order harmonic components of different physical quantities are quite different. The effects of the incident wave height on the reflection, transmission and energy loss coefficients are also discussed. Finally, aiming at the quantitative estimation of the response time and the damping time of gap resonance, two different methods are proposed and verified for the first time on gap resonance.

Original language	English
Pages (from-to)	28-44
Number of pages	17
Journal	Ocean Engineering
Volume	173
Early online date	30 Dec 2018
DOIs	https://doi.org/10.1016/j.oceaneng.2018.12.052
Publication status	Published - 1 Feb 2019

Funding

This work is financially supported by the National Natural Science Foundation of China (Grant no. 51609108 ) and the Jiangsu Government Scholarship for Overseas Studies (awarded to Dr. Junliang Gao for study abroad at the University of Bath). The authors also thank UK EPSRC and the Royal Academy of Engineering for providing partial support for this work within the UK-China joint projects ResIn ( EPSRC Grant No. EP/R007519/1 ) and the UK-CIAPP ( RAE Grant No. UK-CIAPP/73 ). We also express our thanks to Dr. Wei Bai (Manchester Metropolitan University) and Dr. Xingya Feng (University of Oxford) for their support for this study.

Keywords

Gap resonance
Harmonic analysis
OpenFOAM
Response time and damping time of gap resonance
Wave force
Wave height amplification

ASJC Scopus subject areas

Environmental Engineering
Ocean Engineering

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10.1016/j.oceaneng.2018.12.052

Gap resonance -Ocean Engineering 2019Accepted author manuscript, 1.39 MBLicence: CC BY-NC-ND

Cite this

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title = "On hydrodynamic characteristics of gap resonance between two fixed bodies in close proximity",

abstract = "The resonant water motion inside a narrow gap between two identical fixed boxes that are in side-by-side configuration is investigated using a two-dimensional (2D) numerical wave tank based on OpenFOAM{\textregistered}, an open source CFD package. Gap resonance is excited by regular waves with various wave heights, ranging from linear waves to strong nonlinear waves. This paper mainly focuses on the harmonic analyses of the free-surface elevation in the narrow gap and wave loads (including the horizontal wave forces, the vertical wave forces and the moments) on the bodies. It is found that the influences of the incident wave height on the higher-order harmonic components of different physical quantities are quite different. The effects of the incident wave height on the reflection, transmission and energy loss coefficients are also discussed. Finally, aiming at the quantitative estimation of the response time and the damping time of gap resonance, two different methods are proposed and verified for the first time on gap resonance.",

keywords = "Gap resonance, Harmonic analysis, OpenFOAM, Response time and damping time of gap resonance, Wave force, Wave height amplification",

author = "Junliang Gao and Jun Zang and Lifen Chen and Qiang Chen and Haoyu Ding and Yingyi Liu",

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T1 - On hydrodynamic characteristics of gap resonance between two fixed bodies in close proximity

AU - Gao, Junliang

AU - Zang, Jun

AU - Chen, Lifen

AU - Chen, Qiang

AU - Ding, Haoyu

AU - Liu, Yingyi

PY - 2019/2/1

Y1 - 2019/2/1

N2 - The resonant water motion inside a narrow gap between two identical fixed boxes that are in side-by-side configuration is investigated using a two-dimensional (2D) numerical wave tank based on OpenFOAM®, an open source CFD package. Gap resonance is excited by regular waves with various wave heights, ranging from linear waves to strong nonlinear waves. This paper mainly focuses on the harmonic analyses of the free-surface elevation in the narrow gap and wave loads (including the horizontal wave forces, the vertical wave forces and the moments) on the bodies. It is found that the influences of the incident wave height on the higher-order harmonic components of different physical quantities are quite different. The effects of the incident wave height on the reflection, transmission and energy loss coefficients are also discussed. Finally, aiming at the quantitative estimation of the response time and the damping time of gap resonance, two different methods are proposed and verified for the first time on gap resonance.

AB - The resonant water motion inside a narrow gap between two identical fixed boxes that are in side-by-side configuration is investigated using a two-dimensional (2D) numerical wave tank based on OpenFOAM®, an open source CFD package. Gap resonance is excited by regular waves with various wave heights, ranging from linear waves to strong nonlinear waves. This paper mainly focuses on the harmonic analyses of the free-surface elevation in the narrow gap and wave loads (including the horizontal wave forces, the vertical wave forces and the moments) on the bodies. It is found that the influences of the incident wave height on the higher-order harmonic components of different physical quantities are quite different. The effects of the incident wave height on the reflection, transmission and energy loss coefficients are also discussed. Finally, aiming at the quantitative estimation of the response time and the damping time of gap resonance, two different methods are proposed and verified for the first time on gap resonance.

KW - Gap resonance

KW - Harmonic analysis

KW - OpenFOAM

KW - Response time and damping time of gap resonance

KW - Wave force

KW - Wave height amplification

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SP - 28

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JO - Ocean Engineering

JF - Ocean Engineering

ER -

On hydrodynamic characteristics of gap resonance between two fixed bodies in close proximity

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Jun Zang

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On hydrodynamic characteristics of gap resonance between two fixed bodies in close proximity

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ASJC Scopus subject areas

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Jun Zang

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