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32nd International Ocean and Polar engineering Conference, ISOPE 2022

作者： Sun, Zhihao Yin, Qilin Yuan, Zhiming Zhai, Jinjin School of Naval Architecture and Ocean Engineering Jiangsu University of Science and Technology Jiangsu Zhenjiang China

ISBN: (纸本)9781880653814

In this paper, a deep tripod-bucket foundation with a height-diameter ratio of 2:1 is proposed. The three-dimensional finite element model considering the interaction between the tripod-bucket foundation and soil is established in ABAQUS. The ultimate bearing capacities Hult, Vult and Mult of foundation in homogeneous clay seabed under pure horizontal load (H), vertical load (V) and moment load (M) are calculated. Furthermore, the loading performance of the foundation under combined load conditions was studied with fixed displacement ratio method. Considering the tripod-bucket foundation can withstand upward and downward loads, the combined bearing capacities under vertical upward (V+) and vertical downward (V-) load conditions are involved in this study. Results show that H and M in V+-H and V+-M load space decrease gradually with the increase of V+. In V--H load space, H increases with the increase of V-, then keeps constant, and then gradually decreases. In V--M load space, M increases with the increase of V-, then decreases gradually. In V-H-M load space, the H-M envelope is unsymmetrical about M axis. Under different V levels the shape and range of each H-M envelope are different. Finally, the dimensionless standard envelope of the deep tripod-bucket foundation is analyzed, and the failure mode of soil around the monopile is studied. © 2022 The International Society of Offshore and Polar Engineers (ISOPE). All rights reserved.

关键词： Bearing capacity

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Predictions of Bearing Capacities of OWT Monopile Foundations based on BP Neutral Network 32nd

Predictions of Bearing Capacities of OWT Monopile Foundation...

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32nd International Ocean and Polar engineering Conference, ISOPE 2022

作者： Zhai, Jinjin Yin, Qilin School of Naval Architecture & Ocean Engineering Jiangsu University of Science and Technology Jiangsu Zhenjiang China

ISBN: (纸本)9781880653814

Offshore wind energy has become one of the fastest growing sustainable energies. The bearing performances of foundation structures of offshore wind turbines (OWTs) are closely associated with structural security. In this paper, taking into account the coupling effects of wind, wave and current on the OWTs, the three-dimensional non-linear finite element analysis coupled with the BP neutral network model are applied on prediction of the static bearing performances of OWT monopile foundations. Meanwhile, the normal operating condition and the braked condition of OWT structures are considered in the coupled model. The non-linear finite element analyses coupled with the probabilistic statistical methodology can provide reference for the online monitoring of the structural safety state of the OWT, and can be potentially applied to subsequent analyses including the failure risk analysis, economic evaluation, and structural optimization. © 2022 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Bearing capacity

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Study on HOBEM Based on Analytical Panel Integrals Related to Translating-Pulsating Source for Hydrodynamic Responses of Vessels Sailing in Waves

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China Ocean engineering 2022年第3期36卷 348-362页

作者： YANG Yun-tao ZHU Ren-chuan LI Yu-long School of Naval Architecture and Civil Engineering Jiangsu University of Science and TechnologyZhangjiagang 215600China State Key Laboratory of Ocean Engineering Collaborative Innovation Center for Advanced Ship and Deep-Sea ExplorationSchool of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China Technology Centre for Offshore and Marine Singapore(TCOMS)Singapore

A higher-order boundary element method(HOBEM)incorporated with analytical panel integrals related to translat-ing-pulsating source Green’s function is proposed for the hydrodynamic response prediction of ships advancing in *** this method,the 9-node bi-quadratic curvilinear elements employed to discretize the mixed-source/dipole boundary integral equation are mapped into the parametric plane through a coordinate *** in order to ease the numerical instability problem,a novel analytical quadrature is derived to calculate the influence coefficients by changing the integral order and using integration by *** singularity caused by infinite discontinuity is analyzed and eliminated by adopting some mathematical *** the calculations of panel integrals of Green’s function and its x-derivative,the analytical integral method is proved to be always accurate even for field points approaching the free surface,where numerical quadrature is impossible to give reasonable *** on this,a higher-order seakeeping program is developed and applied in the motion response prediction of two different types of ships(i.e.,a wall-sided ship Wigley III and a non-wall-sided ship S175).By comparing the computed results with the corresponding experimental data and numerical solutions of the translating-pulsating and higher-order Green’s function methods based on traditional Gauss quadrature,it is found that the HOBEM based on analytical quadrature is of better accuracy and *** the non-wall-sided ship,only the present method can produce reasonable pre-diction of motion responses,while obvious oscillatory phenomenon is observed in the results of the other two numerical methods based on Gauss quadrature.

关键词： HOBEM translating-pulsating Green’s function analytical quadrature seakeeping forward speed

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Turbulence effects on wave load acting on a curved sea wall 32nd

Turbulence effects on wave load acting on a curved sea wall

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32nd International Ocean and Polar engineering Conference, ISOPE 2022

作者： Hu, Xiao Chen, Shuling School of Naval Architecture and Ocean Engineering Jiangsu University of Science and Technology Jiangsu Zhenjiang China

ISBN: (纸本)9781880653814

In the coastal engineering, the prediction of wave load on a coastal wall structure plays a crucial role for evaluating the reliability and survivability of the structure. This paper contributes to the multi-scale comparative study conducted in the ISOPE 2022 regarding the regular wave impact on the sea wall, by using the commercial software STAR-CCM+, a two-phase flow with volume of fluid (VOF) technique will be used to model the water waves. After being validated using the experimental data, a further investigation on the turbulent effect during the violent wave impact will be carried out. In this investigation, the fluid is considered to be incompressible and different turbulence modelling will be used. © 2022 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Water waves

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A Boundary Integral Equation Method for Wave Loads on A Ship in An Ice Channel 32nd

A Boundary Integral Equation Method for Wave Loads on A Ship...

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32nd International Ocean and Polar engineering Conference, ISOPE 2022

作者： Shi, Yuyun Chen, Naizhe Li, Zhifu School of Naval Architecture and Ocean Engineering Jiangsu University of Science and Technology Jiangsu Zhenjiang China

ISBN: (纸本)9781880653814

In this paper, the computation of wave loads on a ship in an ice channel is carried out through a boundary integral equation method. The ice channel is confined between two semi-infinite ice sheets. The linearized velocity potential theory is used for the fluid flow and the thin elastic plate model is adopted for the ice sheet. A boundary integral equation is constructed, in which the Green function satisfying all the boundary conditions apart from that on the ship surface is adopted. Detailed results for wave loads on a barge ship are provided, which are generally highly oscillatory due to the complex wave/body/ice interaction. © 2022 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Ships

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Hydrodynamic Behaviour of A Ship Navigation Near A Large Ice Sheet 32nd

Hydrodynamic Behaviour of A Ship Navigation Near A Large Ice...

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32nd International Ocean and Polar engineering Conference, ISOPE 2022

作者： Shi, Yuyun Yan, Yunhe Li, Zhifu School of Naval Architecture and Ocean Engineering Jiangsu University of Science and Technology Jiangsu Zhenjiang China

ISBN: (纸本)9781880653814

The wave interaction problem with a ship floating in the open water near a large ice sheet is considered. In this work, the linearized velocity potential theory is adopted for fluid flow and the thin elastic plate theory is used for the ice sheet. The large ice sheet is assumed to be semi-infinite extended and of uniform properties. A boundary integral equation is developed for the velocity potential based on a specific Green function, which satisfies both the boundary conditions on free-surface and the semi-infinite ice sheet. Numerical results show oscillatory behaviours of the wave load against the wavenumber when the ship is closed to the semi-infinite ice sheet. © 2022 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Boundary element method

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Hydrodynamic-aerodynamic performance of a barge-type floating offshore wind turbine with four moonpools and moorings

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Frontiers in Energy Research 2025年 13卷

作者： Li, Yueyang Sun, Shi Yan Cui, Jie School of Naval Architecture and Ocean Engineering Jiangsu University of Science and Technology Zhenjiang China

Introduction: This study investigates the hydrodynamic and aerodynamic performance of a barge-type floating offshore wind turbine (FOWT) equipped with four moonpools and horizontal springs as mooring lines. The integration of moonpools enhances the platform’s hydrodynamic performance by increasing the moment of inertia, recovery torque, and damping effects, while the horizontal springs mitigate the tilt angle caused by wind-induced thrust moments. Methods: Numerical simulations are conducted using viscous flow theory, the Finite Volume Method (FVM), and the Volume of Fluid (VOF) method to model the fluid domain under varying wind and wave conditions. Results: The motion responses and the wind thrust at different wave periods and wind speeds are provided. Discussion: The results demonstrate that the springs effectively reduce the tilt angle and restrain heave motion across different wind speeds and waves. Copyright © 2025 Li, Sun and Cui.

关键词： Viscous flow

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Wave Motion in A Frozen Harbour Based on the Domain Decomposition Method 32nd

Wave Motion in A Frozen Harbour Based on the Domain Decompos...

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32nd International Ocean and Polar engineering Conference, ISOPE 2022

作者： Shi, Yuyun Wang, Fengzhen Li, Zhifu School of Naval Architecture and Ocean Engineering Jiangsu University of Science and Technology Jiangsu Zhenjiang China

ISBN: (纸本)9781880653814

In this paper, a domain decomposition method is developed to solve the problem of wave interaction with a frozen harbour. The linearized velocity potential theory is adopted for fluid flow and the ice sheet is modelized as a thin elastic plate. The domain is divided into two subdomains. In interior harbour, the velocity potential is expanded into series of eigenfunctions, while in exterior harbour with a free surface, the velocity potential is solved by boundary element method through a modified Green function. An inner product is introduced to impose the impermeable condition on the harbour wall, together with the edge conditions on the ice sheet. Computations are carried out for a rectangular harbour for validation and discussion. © 2022 The International Society of Offshore and Polar Engineers (ISOPE). All rights reserved.

关键词： Eigenvalues and eigenfunctions

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Joint stress of a hinged platform composed of eight boxes 2

Joint stress of a hinged platform composed of eight boxes

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2023 2nd International Conference on Acoustics, Fluid Mechanics and engineering, AFME 2023

作者： Zhao, Jiancheng Zhang, Bihui An, Hao Sun, Rui School of Naval Architecture and Ocean Engineering Jiangsu University of Science and Technology Jiangsu Zhenjiang212003 China Shandong Jiaogong Construction Group Co. Ltd Shandong Rizhao276800 China

The box-type hinged platform has important applications in ocean engineering. In this paper, a multi-module assembled box-type platform is described. The mid-section load of the platform is numerically simulated based on the three-dimensional velocity potential theory and the indirect time-domain method through the hydrodynamic module AQWA in ANSYS. The stress of the hinged joints of platforms was performed using finite element analysis software in ANSYS software. The results show that: (1) In irregular waves, the shear force and bending moment in the middle section of the platform increases with the increase of the significant wave height;(2) Under the same towing scheme, the stress of the hinged joints between box platforms shows an increasing trend with the increase of wave level. Under the same wave working condition, the stress at the uniaxial nut of the hinged joints is relatively high, which is prone to fracture. © Published under licence by IOP Publishing Ltd.

关键词： Shear flow

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Dynamic Response of the U-Typed Sandwich Panel Under Explosion Load Based on the SDOF Method

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China Ocean engineering 2022年第5期36卷 814-826页

作者： LIU Kun GAO Yu ZHAO Chen-shui WANG Ze-ping School of Naval Architecture and Ocean Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China College of Shipbuilding Engineering Harbin Engineering UniversityHarbin 150001China Qingdao Innovation and Development Center of Harbin Engineering University Qingdao 266000China

Sandwich panel is commonly used in ship and marine engineering equipment,such as side structure and superstructure deck of a ship,which is of good anti-explosion *** paper addresses a study on the dynamic response of the U-typed sandwich panel under explosion load through the numerical simulation and theoretical *** on the orthotropic plate theory,the U-typed sandwich panel is simplified and transformed into a single degree of freedom(SDOF)spring system,the equivalent motion equation of the SDOF system and the expression of triangular explosion load function are established based on the SDOF theory,and the maximum response spectrum of the SDOF system is ***,the response of the equivalent SDOF system of the U-typed sandwich panel under explosion load is analyzed,and the theoretical results match well with the numerical simulation results,which verifies the accuracy of the theoretical method proposed in this *** theoretical method proposed in this paper could have good engineering applications for the structural anti-explosion design,and provide a reference for the evaluation of the anti-explosion performance of ship and offshore platform structures.

关键词： U-typed sandwich panel the orthotropic plate theory oil and gas explosion SDOF method dynamic response

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