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Influences of Floater Motion on gap resonance Triggered by Focused Wave Groups

China Ocean Engineering 2023年第4期37卷 685-697页

作者： GAO Jun-liang LYU Jing ZHANG Jian ZANG Jun School of Naval Architecture and Ocean Engineering Jiangsu University of Science and TechnologyZhenjiang 212100China Key Laboratory of Port Waterway and Sedimentation Engineering of MOTNanjing Hydraulic Research InstituteNanjing 210029China Key Laboratory of Water Security Guarantee in Guangdong-Hong Kong-Marco Greater Bay Area of Ministry of Water Resources Guangzhou 510611China Centre for Infrastructure Geotechnical and Water Engineering(IGWE)Department of Architecture and Civil EngineeringUniversity of BathBA27AYUK

The current study investigates the hydrodynamic characteristics of gap resonance within a narrow gap formed by two adjacent boxes subjected to incident focused transient wave groups.A two-dimensional(2D)numerical wave tank based on the OpenFOAM package is utilized for this *** weather-side box is fixed while the lee-side box is allowed to heave freely under wave *** effects of the focused wave amplitude and spectral peak period on the wave amplification within the gap,motion of the lee-side box,and wave forces(including horizontal and vertical wave forces)acting on each box are systematically *** comparison,another structural layout consisting of two fixed boxes is also *** results reveal that the release of the heave degree of freedom(DoF)of the lee-side box results in remarkably distinct resonance *** the heave-box system,both its fluid resonant period and the period corresponding to the maximum heave displacement of the lee-side box are significantly larger(i.e.,1.6-1.7 times)than the fluid resonant period of the fixed-box ***,the wave amplification factor inside the gap in the heave-box system is significantly lower than that in the fixed-box *** the variations of the maximum horizontal and vertical wave forces with the spectral peak period and their magnitudes are also significantly different between the two structural systems.

关键词： gap resonance focused waves wave amplification wave forces OpenFOAM

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Harmonic Analyses of Hydrodynamic Characteristics for gap resonance Between Fixed Box and Vertical Wall

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China Ocean Engineering 2021年第5期35卷 712-723页

作者： HE Zhi-wei GAO Jun-liang CHEN Hong-zhou ZANG Jun LIU Qian WANG Gang School of Naval Architecture and Ocean Engineering Jiangsu University of Science and TechnologyZhenjiang 212100China School of Civil Engineering and Architecture Northeast Electric Power UniversityJilin 132012China Centre for Infrastructure Geotechnical and Water Engineering(IGWE)Department of Architecture and Civil EngineeringUniversity of BathBA27AYUK College of Harbour Coastal and Offshore EngineeringHohai UniversityNanjing 210098China

Two marine structures arranged side by side with a narrow gap may suffer from violent free-surface resonance,which would cause green water on deck,dramatically raise hydrodynamic loads on structures and seriously threaten the operation *** CFD-based open-sourced software,OpenFOAM?,is employed to simulate the twodimensional fluid resonance inside a narrow gap between a fixed box and a vertical wall induced by regular waves with different wave *** topographies with various plane slopes are placed in front of the *** focus of this article is on the influences of the incident wave height and the topographic slope on the nonlinear characteristics of various hydrodynamic parameters(including the wave height in the gap,the vertical wave force,and the horizontal wave force on the box)during gap *** ratios of their high-order to the corresponding 1 st-order components under different sets of the incident wave height and the topographic slope are *** is found that the relative importance of all the high-order components increases gradually with the incident wave height for all the three *** topographic influence on them closely depends on the type of the parameters and the incident wave *** addition,the occurrence of the 2 nd-order gap resonance phenomenon can cause the 2 nd-order wave height and horizontal force to be significantly larger than the corresponding 1 st-order components.

关键词： gap resonance harmonic analyses resonant wave height wave loads OpenFOAM

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Investigation on Effects of Vertical Degree of Freedom on gap resonance Between Two Side-by-Side Boxes Under Wave Actions

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China Ocean Engineering 2022年第3期36卷 403-412页

作者： HE Zhi-wei GAO Jun-liang SHI Hua-bin ZANG Jun CHEN Hong-zhou LIU Qian School of Naval Architecture and Ocean Engineering Jiangsu University of Science and TechnologyZhenjiang 212100China State Key Laboratory of Internet of Things for Smart City and Department of Civil and Environmental Engineering University of MacaoMacao 999078China Centre for Infrastructure Geotechnical and Water Engineering(IGWE)Department of Architecture and Civil Engi-neeringUniversity of BathBA27AYUK School of Civil Engineering and Architecture Northeast Electric Power UniversityJilin 132012China

The possible wave resonance in the narrow gap formed by the parallel arrangement of ships will lead to the sharp increase of wave loads and the rapid growth of motion *** fluid resonance inside a narrow gap between two side-by-side boxes is investigated numerically based on an open-source CFD package,*** upstream box remains fixed,while the downstream box is allowed to heave freely under wave *** work aims to examine the influence of the motion of the downstream box on the fluid resonant behaviors inside the *** hydrodynamic behaviors considered include the wave height inside the gap,the heave displacement,and the reflection,transmission,and energy loss *** et al.(2021)reported the influence of the motion of the upstream box on gap resonant *** comparative study,some results of Gao et al.(2021)are also presented in this *** is found that the heave motion of any box in the two-box system leads to a smaller resonant wave height amplification and a larger fluid resonance *** frequency at which the maximum heave displacement of the downstream box occurs is less than the fluid resonant *** heave motion of any box in the two-box system results in a larger reflection coefficient and a smaller energy loss coefficient.

关键词： gap resonance wave height amplification heave motion OpenFOAM

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Investigations on Fluid resonance Within A Narrow gap Formed by Two Fixed Bodies with Varying Breadth Ratios

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China Ocean Engineering 2023年第6期37卷 962-974页

作者： GONG Shu-kai GAO Jun-liang MAO Hong-fei School of Naval Architecture and Ocean Engineering Jiangsu University of Science and TechnologyZhenjiang 212100China State Key Laboratory of Hydraulic Engineering Intelligent Construction and Operation Tianjin UniversityTianjin 300350China College of Ocean Engineering and Energy Guangdong Ocean UniversityZhanjiang 524000China Guangdong Provincial Key Laboratory of Intelligent Equipment for South China Sea Marine Ranching Guangdong Ocean UniversityZhanjiang 524088China

The resonant motion of the fluid inside a narrow gap between two fixed boxes induced by incident regular waves with various wave heights is investigated by adopting a two-dimensional numerical wave flume based on an opensourced CFD package,*** two boxes have identical draft and height,but the upstream box has a variable *** article focuses on the influences of the breadth ratio,defined as the ratio of the breadth of the upstream box to that of the downstream box,on the following three aspects of hydrodynamic characteristics of gap resonance:(1)the wave height amplifications inside the gap,and in front and at the rear of the structure system,(2)the reflection,transmission,and energy loss coefficients of the structure system,and(3)the response and damping time of the fluid *** is found that the fluid resonant frequency,the amplification factor of the resonant wave height inside the gap and the maximum energy loss coefficient of the structure system are shown to gradually decrease with the increase of the breadth *** response time of gap resonance is shown to first increase and then decrease with the breadth ratio overall,regardless of the incident wave height,and the configuration that the two boxes have the same breadth would bring the largest response time of gap resonance.

关键词： gap resonance wave amplification varying breadth ratios OpenFOAM

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A Semi-Analytical Potential Solution for Wave resonance in gap Between Floating Box and Vertical Wall

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China Ocean Engineering 2020年第6期34卷 747-759页

作者： LIU Yong LI Hua-jun LU Lin LI Ai-jun TAN Lei Shandong Provincial Key Laboratory of Ocean Engineering Ocean University of ChinaQingdao 266100China State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116024China

Based on potential flow theory, a dissipative semi-analytical solution is developed for the wave resonance in the narrow gap between a fixed floating box and a vertical wall by using velocity potential decompositions and matched eigenfunction expansions. The energy dissipation near the box is modelled in the potential flow solution by introducing a quadratic pressure loss condition on the gap entrance. Such a treatment is inspired by the classical local head loss formula for the sudden change of cross section in channel flow, where the energy dissipation is assumed to be proportional to the square of local velocity for high Reynolds number flows. The dimensionless energy loss coefficient is calibrated based on experimental data. And it is found to be insensitive to the incident wave height and wave frequency. With the calibrated energy loss coefficient, the resonant wave height in gap and the reflection coefficient are calculated by the present dissipative semi-analytical solution. The predictions are in good agreement with experimental data. Case studies suggest that the maximum relative energy dissipation occurs near the resonant frequency, which leads to the minimum reflection coefficient. The horizontal wave forces on the box and the vertical wall attain also maximum values near the resonant frequency, while the vertical wave force on the box decreases abruptly there to a small value.

关键词： gap resonance semi-analytical solution quadratic pressure loss reflection coefficient wave forces iterative calculations

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The influence of up-wave barge motion on the water resonance at a narrow gap between two rectangular barges underwaves in the sea

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Acta Oceanologica Sinica 2018年第11期37卷 68-76页

作者： JIN Ruijia NING Dezhi BAI Wei GENG Baolei State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology National Engineering Laboratory for Port Hydraulic Construction Technology Tianjin Research Institute for Water Transportation Engineering School of Computing Mathematics and Digital Technology Manchester Metropolitan University

A three-dimensional time-domain potential flow model is developed and applied to simulate the wave resonance in a gap between two side-by-side rectangular barges. A fourth-order predict-correct method is implemented to update free surface boundary conditions. The response of an up-wave barge is predicted by solving the motion equation with the Newmark-β method. Following the validation of the developed numerical model for wave radiation and diffraction around two side-by-side barges, the influence of up-wave barge motion on the gap surfaceresonance is investigated in two different locations of the up-wave barge relative to the back-wave barge at various frequencies. The results reveal that the freely floating up-wave barge significantly influences the resonance frequency and the resonance wave amplitude. Simultaneously, the up-wave barge located in the middle of the back-wave barge leads to a reduction in the resonance wave amplitude and motion response when compared with other configurations.

关键词： side-by-side barges gap resonance time-domain model up-wave barge motion

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Numerical study of fluid resonance of a two-dimensional heaving-free moonpool in a wide range of incident waves

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Journal of Hydrodynamics 2022年第4期34卷 647-664页

作者： Peng-lin Jing Guang-hua He Zheng-xiao Luan Chao-gang Liu Hao Yang School of Mechatronics Engineering Harbin Institute of TechnologyHarbin 150001China School of Ocean Engineering Harbin Institute of TechnologyWeihaiWeihai 264209China Shandong Institute of Shipbuilding Technology Weihai 264209China

The fluid resonance of a moonpool freely heaving in a beam sea is studied by an in-house constrained interpolation profile(CIP)***,the moonpool behaves as in the piston mode with a narrow *** numerical studies are carried out for a wide range of the incident waves,and a new secondary resonant region is identified in the low frequency region of the incident waves,besides the ordinary main resonant *** results demonstrate that the horizontal wave forces are significant in the secondary resonant region,although the resonant wave elevations are less remarkable than those of the main resonant *** is concluded that the fluid resonance of the low frequency is excited mainly by the heave motion of the *** studies of the moonpool draft and the gap width of the moonpool based on the fluid resonance are also performed.

关键词： gap resonance low-frequency incident wave heave motion constrained interpolation profile(CIP)

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Conditions and Phase Shift of Fluid resonance in Narrow gaps of Bottom Mounted Caissons

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China Ocean Engineering 2017年第6期31卷 724-735页

作者： ZHU Da-tong WANG Xing-gang LIU Qing-jun Jiao Zhuan Research Center Southeast University Nanjing 210018 China Nanjing Hydraulic Research Institute Nanjing 210029 China Key Laboratory of Port Waterway and Sedimentation Engineering of the Ministry of Transport Nanjing 210029 China College of Harbor Coastal and Offshore Engineering Hohai University Nanjing 210098 China

This paper studies the viscid and inviscid fluid resonance in gaps of bottom mounted caissons onthe basis of the plane wave hypothesis and full wave model, The theoretical analysis and the numerical results demonstrate that the condition for the appearance of fluid resonance in narrow gaps is kh=（2n＋1）π （n=0, 1, 2, 3 ）, rather than kh=nn （n=0, 1, 2, 3, ...）; the transmission peaks in viscid fluid are related to the resonance peaks in the gaps. k and h stand for the wave number and the gap length. The combination of the plane wave hypothesis or the full wave model with the local viscosity model can accurately determine the heights and the locations of the resonance peaks. The upper bound for the appearance of fluid resonance in gaps is 2b/L〈l （2b, grating constant; L, wave length） and the lower bound is h/b〈~ l. The main reason for the phase shift of the resonance peaks is the inductive factors. The number of resonance peaks in the spectrum curve is dependent on the ratio of the gap length to the grating constant. The heights and the positions of the resonance peaks predicted by the present models agree well with the experimental data.

关键词： gap resonance phase shift of resonance peak fluid local viscosity model plane wave hypothesis full wavemodel bottom mounted caissons

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Hole arrayed metal-insulator-metal structure for surface enhanced Raman scattering by self-assembling polystyrene spheres

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Frontiers of physics 2014年第1期9卷 64-68页

作者： Liang-Ping Xia Zheng Yang Shao-Yun Yin Wen-Rui Guo Jing-Lei Du Chun-Lei Du Chongqing Institute of Green and Intelligent Technology Chinese Academy of Sciences Chongqing 401122 China Institute of Optics and Electronics Chinese Academy of Sciences P. O. Box 350 Chengdu 610209 China Physics Department Sichuan University Chengdu 610064 China

A fabrication process based on the self-assembling polystyrene spheres is proposed to obtain hole arrayed metal-insulator-metal （HA-MIM） structure for surface enhanced Raman scattering （SERS）. The localized field enhancement aroused by the gap resonance in the HA-MIM structure is analyzed by finite-different time domain （FDTD） method. With reference to the theory result, the structure is experimentally fabricated and the Raman scattering spectrum of rhodamine 6G （R6G） is measured by a miniaturized Raman spectrometer. The results shows that the enhancement factor is 3.85 times higher than the control sample with single layered metal hole array. The fabrication process to obtain the HA-MIM SERS substrate is reproducible, fast, large area and low cost.

关键词： metal-insulator-metal surface enhanced Raman scattering self-assemble gap resonance

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