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Hydrodynamic Behavior of Fluid resonance Between Twin Boxes in Moonpool with Various Edge Profiles Under wave Actions

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中国海洋工程:英文版 2023年第4期37卷 547-557页

作者： LAN Jun-jie JIANG Sheng-chao GAO Jun-liang Faculty of Vehicle Engineering and Mechanics Dalian University of TechnologyDalian 116024China School of Naval Architecture and Ocean Engineering Jiangsu University of Science and TechnologyZhenjiang 212100China

Fluid resonance in moonpool formed by twin boxes under wave actions is investigated by using a viscous numerical wave flume with ReNormalization Group(RNG)turbulent model.The accuracy of the numerical model is validated by available experimental data.Three types of edge profiles,the sharp edge,concave edge and convex edge are con-sidered.Numerical simulations show that the normalized resonant amplitude in moonpool decreases with the decrease of moonpool opening or increase of incident wave amplitude.The increased reflection coefficients are the major reason for the phenomena,implying less wave energy is able to support the wave resonance in moonpool.With the increase of incident wave height,the energy coefficients increase for convex edges around resonant fre-quency,which are oppositely with those of sharp and concave edges.Various flow patterns of the wave resonance in the vicinity of the moonpool entrance are also identified,which are mainly dependent on the edge profiles.

关键词： moonpool wave resonance corner shape RNG turbulent model OpenFOAM® flow pattern

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A study on nonlinear steady-state waves at resonance in water of finite depth by the amplitude-based homotopy analysis method

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Journal of Hydrodynamics 2020年第5期32卷 888-900页

作者： Da-li Xu Zeng Liu College of Ocean Science and Engineering Shanghai Maritime UniversityShanghai 201306China School of Naval Architecture and Ocean Engineering Huazhong University of Science and TechnologyWuhan 430074China

Nonlinear steady-state waves are obtained by the amplitude-based homotopy analysis method(AHAM)when resonances among surface gravity waves are considered in water of finite depth.AHAM,newly proposed in this paper within the context of homotopy analysis method(HAM)and well validated in various ways,is able to deal with nonlinear wave interactions.In waves with small propagation angles,it is confirmed that more components share the wave energy if the wave field has a greater steepness.However,in waves with larger propagation angles,it is newly found that wave energy may also concentrate in some specific components.In such wave fields,off-resonance detuning is also considered.Bifurcation and symmetrical properties are discovered in some wave fields.Our results may provide a deeper understanding on nonlinear wave interactions at resonance in water of finite depth.

关键词： Nonlinear wave wave resonance steady state homotopy analysis method(HAM)

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Analytical and numerical studies for Seiches in a closed basin with bottom friction

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Theoretical & Applied Mechanics Letters 2020年第6期10卷 429-437页

作者： I.Magdalena H.Q.Rif'atin A.Mauditra A.Matin Faculty of Mathematics and Natural Sciences Bandung Institute of TechnologyBandung 40132Indonesia Center for Coastal and Marine Develoment Bandung Institute of TechnologyBandung 40132Indonesia

A standing wave oscillation in a closed basin,known as a seiche,could cause destruction when its period matches the period of another wave generated by external forces such as wind,quakes,or abrupt changes in atmospheric pressure.It is due to the resonance phenomena that allow waves to have higher amplitude and greater energy,resulting in damages around the area.One condition that might restrict the resonance from occurring is when the bottom friction is present.Therefore,a modified mathematical model based on the shallow water equations will be used in this paper to investigate resonance phenomena in closed basins and to analyze the effects of bottom friction on the phenomena.The study will be conducted for several closed basin shapes.The model will be solved analytically and numerically in order to determine the natural resonant period of the basin,which is the period that can generate a resonance.The computational scheme proposed to solve the model is developed using the staggered grid finite volume method.The numerical scheme will be validated by comparing its results with the analytical solutions.As a result of the comparison,a rather excellent compatibility between the two results is achieved.Furthermore,the impacts that the friction coefficient has on the resonance phenomena are evaluated.It is observed that in the prevention of resonances,the bottom friction provides the best performance in the rectangular type while functioning the least efficient in the triangular basin.In addition,non-linearity effect as one of other factors that provide wave restriction is also considered and studied to compare its effect with the bottom friction effect on preventing resonance.

关键词： wave resonance Closed basin Bottom friction Natural resonant period Shallow water equations

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