Investigations on the second-order transient gap resonance induced by focused wave groups

Jinshi Liu; Junliang Gao; Huabin Shi; Jun Zang; Qian Liu

doi:10.1016/j.oceaneng.2022.112430

Investigations on the second-order transient gap resonance induced by focused wave groups

Jinshi Liu, Junliang Gao, Huabin Shi, Jun Zang, Qian Liu

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Abstract

Two or more marine structures deployed side by side may encounter strong water-body resonances within narrow gaps between them. It may cause significant wave loads on structures and the green water phenomenon on the deck. In this article, the transient fluid motion within a narrow gap formed by two fixed boxes suffered from incident focused wave groups is investigated using a two-dimensional viscous flow numerical wave flume. The focused wave groups adopted have the spectral peak frequency equal to half the fluid resonant frequency inside the gap. The wave fields both inside the gap and around the two-box system, the response/damping time of the transient wave surfaces inside the gap, the maximum wave forces and the ratios of the 2nd-order to the corresponding 1st-order wave surfaces/forces are investigated. It is revealed that the most dangerous place to green water is always the front edge of the two-box system. The damping time of the 2nd-order wave surface is significantly larger than that of the 1st-order one. As the incident wave amplitude rises, the ratios of the 2nd-order to the first-order wave surfaces/forces becomes increases gradually and can even exceed 100% for the wave surface, the horizontal wave force and the moment.

Original language	English
Article number	112430
Journal	Ocean Engineering
Volume	263
Early online date	8 Sept 2022
DOIs	https://doi.org/10.1016/j.oceaneng.2022.112430
Publication status	Published - 1 Nov 2022

Bibliographical note

Funding Information:
This research is financially supported by the National Natural Science Foundation of China (Grant No. 51911530205 ), the Natural Science Foundation of Jiangsu Province (Grant Nos. BK20201455 and BK20210885 ), the Natural Science Foundation of the Jiangsu Higher Education Institutions (Grant No. 20KJD170005 ), the Qing Lan Project of Jiangsu Universities, and the Science and Technology Development Fund , Macau SAR (Grant No. 0050/2020/AMJ ). The authors also thank UK EPSRC (Grant No. EP/T026782/1 ) and the Royal Society (Grant No. IEC\NSFC\181321 ) for providing partial support for this work.

Funding

This research is financially supported by the National Natural Science Foundation of China (Grant No. 51911530205 ), the Natural Science Foundation of Jiangsu Province (Grant Nos. BK20201455 and BK20210885 ), the Natural Science Foundation of the Jiangsu Higher Education Institutions (Grant No. 20KJD170005 ), the Qing Lan Project of Jiangsu Universities, and the Science and Technology Development Fund , Macau SAR (Grant No. 0050/2020/AMJ ). The authors also thank UK EPSRC (Grant No. EP/T026782/1 ) and the Royal Society (Grant No. IEC\NSFC\181321 ) for providing partial support for this work.

Keywords

Focused wave groups
OpenFOAM®
Second-order resonance
Transient gap resonance
Wave amplification
Wave loads

ASJC Scopus subject areas

Environmental Engineering
Ocean Engineering

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1016/j.oceaneng.2022.112430

Revised Manuscript-Ocean Engineering Sept 2022.PDFAccepted author manuscript, 3.1 MBLicence: CC BY-NC-ND

Cite this

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title = "Investigations on the second-order transient gap resonance induced by focused wave groups",

abstract = "Two or more marine structures deployed side by side may encounter strong water-body resonances within narrow gaps between them. It may cause significant wave loads on structures and the green water phenomenon on the deck. In this article, the transient fluid motion within a narrow gap formed by two fixed boxes suffered from incident focused wave groups is investigated using a two-dimensional viscous flow numerical wave flume. The focused wave groups adopted have the spectral peak frequency equal to half the fluid resonant frequency inside the gap. The wave fields both inside the gap and around the two-box system, the response/damping time of the transient wave surfaces inside the gap, the maximum wave forces and the ratios of the 2nd-order to the corresponding 1st-order wave surfaces/forces are investigated. It is revealed that the most dangerous place to green water is always the front edge of the two-box system. The damping time of the 2nd-order wave surface is significantly larger than that of the 1st-order one. As the incident wave amplitude rises, the ratios of the 2nd-order to the first-order wave surfaces/forces becomes increases gradually and can even exceed 100% for the wave surface, the horizontal wave force and the moment.",

keywords = "Focused wave groups, OpenFOAM{\textregistered}, Second-order resonance, Transient gap resonance, Wave amplification, Wave loads",

author = "Jinshi Liu and Junliang Gao and Huabin Shi and Jun Zang and Qian Liu",

note = "Funding Information: This research is financially supported by the National Natural Science Foundation of China (Grant No. 51911530205 ), the Natural Science Foundation of Jiangsu Province (Grant Nos. BK20201455 and BK20210885 ), the Natural Science Foundation of the Jiangsu Higher Education Institutions (Grant No. 20KJD170005 ), the Qing Lan Project of Jiangsu Universities, and the Science and Technology Development Fund , Macau SAR (Grant No. 0050/2020/AMJ ). The authors also thank UK EPSRC (Grant No. EP/T026782/1 ) and the Royal Society (Grant No. IEC\NSFC\181321 ) for providing partial support for this work. ",

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doi = "10.1016/j.oceaneng.2022.112430",

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AU - Shi, Huabin

AU - Zang, Jun

AU - Liu, Qian

N1 - Funding Information: This research is financially supported by the National Natural Science Foundation of China (Grant No. 51911530205 ), the Natural Science Foundation of Jiangsu Province (Grant Nos. BK20201455 and BK20210885 ), the Natural Science Foundation of the Jiangsu Higher Education Institutions (Grant No. 20KJD170005 ), the Qing Lan Project of Jiangsu Universities, and the Science and Technology Development Fund , Macau SAR (Grant No. 0050/2020/AMJ ). The authors also thank UK EPSRC (Grant No. EP/T026782/1 ) and the Royal Society (Grant No. IEC\NSFC\181321 ) for providing partial support for this work.

PY - 2022/11/1

Y1 - 2022/11/1

N2 - Two or more marine structures deployed side by side may encounter strong water-body resonances within narrow gaps between them. It may cause significant wave loads on structures and the green water phenomenon on the deck. In this article, the transient fluid motion within a narrow gap formed by two fixed boxes suffered from incident focused wave groups is investigated using a two-dimensional viscous flow numerical wave flume. The focused wave groups adopted have the spectral peak frequency equal to half the fluid resonant frequency inside the gap. The wave fields both inside the gap and around the two-box system, the response/damping time of the transient wave surfaces inside the gap, the maximum wave forces and the ratios of the 2nd-order to the corresponding 1st-order wave surfaces/forces are investigated. It is revealed that the most dangerous place to green water is always the front edge of the two-box system. The damping time of the 2nd-order wave surface is significantly larger than that of the 1st-order one. As the incident wave amplitude rises, the ratios of the 2nd-order to the first-order wave surfaces/forces becomes increases gradually and can even exceed 100% for the wave surface, the horizontal wave force and the moment.

AB - Two or more marine structures deployed side by side may encounter strong water-body resonances within narrow gaps between them. It may cause significant wave loads on structures and the green water phenomenon on the deck. In this article, the transient fluid motion within a narrow gap formed by two fixed boxes suffered from incident focused wave groups is investigated using a two-dimensional viscous flow numerical wave flume. The focused wave groups adopted have the spectral peak frequency equal to half the fluid resonant frequency inside the gap. The wave fields both inside the gap and around the two-box system, the response/damping time of the transient wave surfaces inside the gap, the maximum wave forces and the ratios of the 2nd-order to the corresponding 1st-order wave surfaces/forces are investigated. It is revealed that the most dangerous place to green water is always the front edge of the two-box system. The damping time of the 2nd-order wave surface is significantly larger than that of the 1st-order one. As the incident wave amplitude rises, the ratios of the 2nd-order to the first-order wave surfaces/forces becomes increases gradually and can even exceed 100% for the wave surface, the horizontal wave force and the moment.

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Investigations on the second-order transient gap resonance induced by focused wave groups

Abstract

Bibliographical note

Funding

Keywords

ASJC Scopus subject areas

UN SDGs

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