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Numerical techniques for coupling hydrodynamic problems in ship and ocean engineering

Journal of hydrodynamics 2020年第2期32卷 212-233页

作者： Xiao-song Zhang Jian-hua Wang De-cheng Wan Computational Marine Hydrodynamics Lab(CMHL) State Key Laboratory of Ocean EngineeringSchool of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai200240China

Most hydrodynamic problems in ship and ocean engineering are complex and highly *** the trend of intelligent and digital design for ships and ocean engineering structures,comprehensive performance evaluation and optimization are of vital importance during *** this process,various coupling effects need to be accurately *** the significant progress of computational fluid dynamics(CFD),many advanced numerical models were proposed to simulate the complex coupling hydrodynamic problems in ship and ocean engineering *** this paper,five key coupling hydrodynamic problems are introduced,which are hull-propeller-rudder coupling,wave-floating structure coupling,aerodynamic-hydrodynamic coupling,fluid structure coupling and fluid-noise coupling,*** paper focuses on the numerical simulation techniques corresponding to each coupling problem,including the theories and the *** directions and conclusions are provided finally.

关键词： Coupling hydrodynamic problems numerical techniques ship and ocean engineering

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Hull form multi-objective optimization of DTMB5415 ship considering arrangement constraints 32nd

Hull form multi-objective optimization of DTMB5415 ship cons...

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32nd International ocean and Polar engineering Conference, ISOPE 2022

作者： Feng, Baiwei Yue, Chaohuan Zhan, Chengsheng Chang, Haichao Key Laboratory of High Performance Ship Technology Wuhan University of Technology Ministry of Education Hubei Wuhan China School of Naval Architecture Ocean and Energy Power Engineering Wuhan University of Technology Hubei Wuhan China

ISBN: (纸本)9781880653814

Hull form optimization, as one of the effective means of energy-saving ship research and development, has been the attention of domestic and foreign researchers. In this paper, a numerical optimization process is proposed to describe the application of a practical ship multidisciplinary design and optimization platform SHIPMDO-WUT developed by a research team at WuHan University of Technology. The platform is composed of ship parameterized deformation module, CFD calculation module, hydrostatic calculation module and optimization module. In this paper, the DTMB5415 ship is taken as the initial ship, and the surface deformation method of radial basis interpolation is adopted as the parameterized hull surface modification technology under the condition of ensuring the arrangement constraints. The bow shape value points are changed to generate a series of hull shapes that meet the arrangement geometric constraints. Combined with CFD calculation tool and multi-objective particle swarm optimization (MOPSO), multi-objective comprehensive optimization of wave resistance performance of the initial ship at given two ship speeds was carried out, and we get a series of optimized ships finally. Two optimized ships were selected for numerical simulation and comparative analysis with initial ship, and the numerical calculation results verified the effectiveness and reliability of the optimized platform. © 2022 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Deformation

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Numerical simulations of propeller cavitation flows based on OpenFOAM

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Journal of hydrodynamics 2020年第6期32卷 1071-1079页

作者： Min-sheng Zhao Wei-wen Zhao De-cheng Wan Computational Marine Hydrodynamics Lab(CMHL) State Key Laboratory of Ocean EngineeringSchool of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai200240China

In order to study the cavitation and hydrodynamic characteristics of propeller under uniform and non-uniform flows,numerical investigations are performed using interPhaseChangeDyMFoam in the open source computational fluid dynamics(CFD)software platform OpenFOAM with Schnerr-Sauer cavitation *** simulation results can be used as a reference to evaluate the working ability of a propeller in case of actual navigation.A new grid encryption method is adopted in the research to better capture the existence of vortex cavitation at the propeller *** method of function input is carried out in the study to simulate the condition of non-uniform flow and reduce the calculation *** unsteady dynamics are predicted by the Reynolds-averaged Navier-Stokes(RANS)method with a modified shear stress transport(SST)k−ωturbulence *** numerical results of the propeller such as cavitation shape and pressure distribution under uniform and non-uniform flow are analyzed and compared with each other.

关键词： OpenFOAM E779A propeller cavitation non uniform flow

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CFD simulations of three-dimensional violent sloshing flows in tanks based on MPS and GPU

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Journal of hydrodynamics 2020年第4期32卷 672-683页

作者： Feng-ze Xie Wei-wen Zhao De-cheng Wan Computational Marine Hydrodynamics Lab(CMHL) School of Naval ArchitectureOcean and Civil EngineeringState Key Laboratory of Ocean EngineeringShanghai Jiao Tong UniversityShanghai 200240China

For violent sloshing,the flow field becomes complicated and 3-D effect is *** addition to the excitation direction,the wave can also propagate perpendicular to the excitation *** to the superposition of waves from different directions,the impact pressure imposed on the wall of the tank may *** this paper,our in-house solver MPSGPU-SJTU based on moving particle semi-implicit(MPS)method coupled with GPU techniques is employed for the liquid sloshing simulation,to study the factors leading to the 3-D ***,a series of sloshing simulations are carried out to validate the reliability of present ***,the sensitivity of 3-D effect against some parameters,such as excitation frequency,dimensions of the tank and filling ratio,is checked through numerical *** histories of pressure obtained by 2-D and 3-D simulations are compared to judge the occurrence of 3-D *** concludes that effects of those parameters are all significant.

关键词： Liquid sloshing 3-D effect sensitive parameters moving particle semi-implicit(MPS)method MPSGPU-SJTU solver

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MPS Method for Interaction Between Solitary Waves and Submerged Horizontal Plate

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China ocean engineering 2020年第3期34卷 314-327页

作者： XU Yan-zhang ZHAO Wei-wen WAN De-cheng Computational Marine Hydrodynamics Lab(CMHL) State Key Laboratory of Ocean EngineeringSchool of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China

The interaction between structure and wave is a typical phenomenon in naval architecture and ocean *** this paper,numerical simulation is carried out to study the interaction between a two-dimensional submerged,fixed,horizontal rigid plate and solitary wave with our in-house meshless particle CFD solver ***,the in-house CFD solver is verified by experimental results conducted at the State key laboratory of Coastal and Offshore engineering,Dalian University of *** the verification,the plate is submerged under water and the solitary wave with a given amplitude is generated by a piston-type wave *** surface elevation of the wave and the pressure impacting on the plate is recorded and compared with experimental data *** predicted pressure and surface elevation agree well with the experimental *** in order to further investigate factors affecting wave-structure interaction,wave height,submerged depth and plate length are analyzed.

关键词： MPS method MLParticle-SJTU solver solitary waves submerged horizontal plate wave-plate interaction

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Simulation of wave scattering over a floating platform in the ocean with a coupled CFD-IBM model

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Theoretical & Applied Mechanics Letters 2024年第3期14卷 157-161页

作者： Pengxuan Luo Jingxin Zhang Yongyong Cao Shaohong Song School of Naval Architecture Ocean&Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China MOE Key Laboratory of Hydrodynamics Shanghai Jiao Tong UniversityShanghai 200240China Shanghai city Tou waterway construction Co. LTDShanghai 200092China

A numerical study of linear wave scattering over a floating platform has been simulated by an efficient numericalmodel in this *** non-hydrostatic model is used to simulate the free surface and the uneven *** thesolid body modelling,the immersed boundary method(IBM)is implemented by introducing a virtual boundaryforce into the momentum equations to emulate the boundary *** implementation enhances theability of the model to simulate interactions between waves and floating structures.A numerical case involvingwave interactions with a floating platform is studied to validate the numerical *** simulating the wavepropagation,the numerical model captures the variation of the wave scattering very well,which verifies theperformance of the numerical model and the robust strategy of the IBM.

关键词： Non-hydrostatic model Immersed boundary method Wave structure interaction Floating platform

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Vortex identification methods in marine hydrodynamics

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Journal of hydrodynamics 2020年第2期32卷 286-295页

作者： Wei-wen Zhao Jian-hua Wang De-cheng Wan Computational Marine Hydrodynamics Lab(CMHL) School of Naval ArchitectureOcean and Civil EngineeringState Key Laboratory of Ocean EngineeringShanghai Jiao Tong UniversityShanghai200240China

In this paper,several commonly used vortex identification methods for marine hydrodynamics are *** order to extract and analyse the vortical structures in marine hydrodynamics,the Q,λ2-criterion and modified normalized Liutex/RortexΩR method are utilized for vortex identification for propeller open water test,ship drag test,ship propeller-rudder interaction,VIV of a marine riser and VIM of a Spar *** limitation of Q andλ2-criterion is *** Liutex/RortexΩR method is promising for convenient and accurate vortex identification and ***,care should be taken when choosing the small parameter b0 forΩ*** proposed recommended values of b0 for marine hydrodynamic problems.

关键词： Marine hydrodynamics vortex identification Omega Liutex/Rortex naoe-FOAM-SJTU solver OpenFOAM

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Research on load characteristics of floating VAWT considering coupling of aerodynamics and hydrodynamics 32nd

Research on load characteristics of floating VAWT considerin...

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32nd International ocean and Polar engineering Conference, ISOPE 2022

作者： Liu, Weiqin Luo, Wenping Li, Ye Zhang, Ding Departments of Ocean Engineering School of Naval Architecture Ocean and Energy Power Engineering Wuhan University of Technology Hubei Wuhan China Laboratory of Multiple Function Towing Tank State Key Laboratory of Ocean Engineering Shanghai Jiaotong University Shanghai China Marine design and research Institute of China Shanghai China

ISBN: (纸本)9781880653814

Vertical Axial Wind Turbine (VAWT) has advantages to utilize wind energy at vertical wind section and to adapt changeful wind direction so that VAWT becomes latest wind turbine type for deep-open sea. In order to discuss load characteristics of floating VAWT caused by coupling movement of blade and platform, a deep-sea floating H-type VAWT is regarded as the research object. A large platform based on computational fluid dynamic (CFD) was used to calculate the load of VAWT in the gas-liquid two-phase flow field, sliding and overset mesh were used to simulate the motion of the rotating blades and platform, the VOF method was used to accurately capture the position of the free liquid surface, and the load characteristics of the VAWT were obtained by combining the multi-grid refining technology. This method was validated by experiment data and used to simulate the load and motion of VAWT under a series of working conditions, and the aerodynamic and hydrodynamic performance of the floating VAWT and its variation with wave height and wave length are found by analyzing the simulation results. © 2022 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： hydrodynamics

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Experimental Investigation of Nonlinear Forces on a Monopile Offshore Wind Turbine Foundation Under Directionally Spread Waves

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Journal of Offshore Mechanics and Arctic engineering 2025年第4期147卷 042002页

作者： Ding, Haoyu Zhao, Guangwei Tang, Tianning Taylor, Paul H. Adcock, Thomas A.A. Dai, Saishuai Ning, Dezhi Chen, Lifen Li, Jinxuan Wang, Rongquan Zang, Jun Department of Architecture and Civil Engineering University of Bath BathBA2 7AY United Kingdom Kelvin Hydrodynamics Laboratory University of Strathclyde GlasgowG20 0TL United Kingdom Department of Engineering Science University of Oxford OxfordOX1 3PJ United Kingdom Oceans Graduate School The University of Western Australia PerthWA6009 Australia Department of Engineering Science University of Oxford OxfordOX1 2DL United Kingdom Naval Architecturem Ocean and Marine Engineering Department University of Strathclyde GlasgowG1 1XQ United Kingdom State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology Liaoning Dalian116024 China State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology Dalian116024 China

Accurate prediction of nonlinear wave loading is crucial for designing marine and offshore structures, yet it remains a challenging task. Prior research has primarily focused on unidirectional extreme sea states, revealing that linear loading cannot accurately represent the total wave forces acting on offshore wind turbine foundations, with significant contributions from high-order harmonics. This study broadens the scope to include multidirectional and bidirectional wave interactions with monopile offshore wind turbine foundations. We use a phase-based harmonic separation method to isolate harmonic components in the presence of complex wave scenarios. This approach allows for the clear delineation of individual harmonics from the total wave force by controlling the phase of incident-focused waves. Remarkably, this method is effective even with multidirectional and bidirectional spreading. The clean separation of individual harmonics enables the estimation of contributions from each harmonic. Our findings are in line with previous research, showing that nonlinear loading can constitute up to 40% of the total under certain wave conditions. We have also observed that wider wave spreading reduces nonlinear high-order harmonics, and unidirectional waves induce the most severe nonlinear forces. These insights emphasize the importance of accounting for high-order nonlinear wave loading in offshore structure design. © 2024 by ASME.

关键词： Offshore wind turbines

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Load forecasting of port multi-energy fusion power system based on improved FFT and ConvMLP-GRU

Load forecasting of port multi-energy fusion power system ba...

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Advanced Control Systems and Automation Technologies (ACSAT), International Conference on

作者： Dianqiang Zhou Xujing Tang Wei Guo Tian Wang School of Naval Architecture Ocean and Energy Power Engineering Wuhan University of Technology Hubei China State Key Laboratory of Maritime Technology and Safety Wuhan University of Technology Hubei China

ISBN: (数字)9798331541668

ISBN: (纸本)9798331541675

Accurate electrical load prediction is essential for the stable operation of multi-energy fusion power systems at ports, which integrate wind and solar energy. To address the challenges of low prediction accuracy for long sequences, stemming from disordered port load data and insufficient semantic information, this paper proposes a load power forecasting method based on an improved FFT and ConvMLP-GRU. The Hanning window function is employed to optimize the FFT process, thereby reducing spectral leakage and endpoint effects. The top k amplitudes and their corresponding frequencies are extracted to compute the data period, allowing for the decomposition of the original load data into a two-dimensional tensor. ConvMLP is then utilized to extract features both within and between data periods, while GRU are employed for load prediction. Experimental results using load data from the port of Ningbo demonstrate that the proposed method enhances short-term prediction accuracy and reduces prediction errors for long sequences when compared to classical deep learning models.

关键词： Accuracy Tensors Fast Fourier transforms Load forecasting Semantics Predictive models Feature extraction Power systems Data mining Load modeling

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