检索结果-南通市图书馆

A 2-D NUMERICAL irregular WAVE TANK AND ITS VERIFICATION

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2005年第2期17卷 222-227页

作者： LIBen-xia YUXi-ping YUYu-xiu DepartmentofHydrauhcEngineering TsinghuaUniversityBeijing100084China StateKeyLaboratoryofCoastalandOffshoreEngineering DalianUniversityofTechnologyDalian116024China

A two-dimensional numerical irregular wave tank based on the potential wave theory was developed. A source term was used inside the domain to generate waves, and outgoing waves were dissipated by sponge layers and transmitted by radiation boundary. The σ-coordinate transformation was introduced to map the time-dependent irregular physical domain to a fixed regular computational domain, and thus the free surface and bottom boundary conditions could be implemented precisely. The model was verified by simulating the nonlinear regular and irregular wave propagation on constant-depth water, as well as regular waves reflected from a vertical wall, and satisfactory agreement between numerical results and analytical solutions was obtained. The present numerical model is proved to be an effective tool for a long-duration simulation of coastal wave dynamics where the wave reflection is significant.

关键词： irregular waves numerical wave tank source wave-generating method σ-coordinate transformation potential wave theory

Numerical Study of the Impact of Climate Change on irregular Wave Run-up Over Reef-Fringed Coasts

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 2020年第2期34卷 162-171页

作者： LIU Wei-jie SHAO Ke-qi NING Yue ZHAO Xi-zeng Ocean College Zhejiang UniversityZhoushan 316021China Key Laboratory of Port Waterway&Sedimentation EngineeringMinistry of CommunicationsNanjing 210029China

Wave hydrodynamics over fringing reefs is largely controlled by the reef surface roughness and hydrodynamic *** is believed that climate change will result in a net increase in the water depth over the reef flat,a degrading of the surface roughness of coral reefs and changes in extreme incident wave *** an accurate assessment of how climate change affects the safety of reef-fringed coasts,a numerical study of the impact of climate change on irregular wave run-up over reef-fringed coasts was carried out based on a Boussinesq wave model,*** with experimental data,the present model shows reasonable prediction of irregular wave evolution and run-up height over fringing *** experiments were then implemented based on the anticipated effects of climate change and carried out to investigate the effects of sea level rise,degrading of the reef surface roughness and increase of extreme incident wave height on the irregular wave run-up height over the backreef beach *** of run-up components(i.e.,spectral characteristics of run-up and mean water level)were examined specifically and discussed to better understand the influencing mechanism of each climate change-related effect on the run-up.

关键词： fringing reefs irregular waves climate change infragravity run-up height

THE　STATISTIC　CHARACTERISTICS　OF　irregular　BREAKING　WAVE　FORCES　ON　VERTICAL　WALLS

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 1995年第1期7卷 50-57页

作者： Li Yu-cheng Liu Da-zhong (Dept.of Civil Engineering,Dalian University of Technology,Dalian 116023, P. R. China) Dalian Univ of Technology Dalian China

When irregular waves attack a vertical wall, standing waves and breaking (or broken) waves will occur in front of the wall. The statistic characteristics of standing wave forces on vertical wall are the same as that of incident waves. But for breaking or broken waves, only large waves break, so the statistic characteristics of breaking wave forces are different to that of standing waves or incident waves. Following a series model test of irregular breaking waves on vertical wall the statistic characterisitics of breaking wave *** were analyzed in this paper. It is found by authors that Weibul distribution may be used to express the statistic distribution of breaking wave forces acting on vertical wall. msed on the analysis of model test data, it is indicated in this paper that the shape parameter m in Weibul distribution is a function of and , in which H is the wave height, d1 is the water depth at the toe of vertical wall and d is the water depth in front of the whole structure; and the theoretical value of scale parameter a can be determined from shape parameter m.

关键词： irregular waves breaking waves wave forces vertical wall.

A framework for efficient irregular wave simulations using Higher Order Spectral method coupled with viscous two phase model

在线全文

学校读者我要写书评

暂无评论

Journal of Ocean Engineering and Science 2017年第4期2卷 253-267页

作者： Inno Gatin Vuko Vukčević Hrvoje Jasak Faculty of Mechanical Engineering and Naval Architecture University of ZagrebIvana Lučića 5ZagrebCroatia Wikki Ltd. 459 Southbank HouseSE17SJ LondonUnited Kingdom

In this paper a framework for efficient irregular wave simulations using Higher Order Spectral method coupled with fully nonlinear viscous,two-phase Computational Fluid Dynamics(CFD)model is *** model is based on solution decomposition via Spectral Wave Explicit Navier-Stokes Equation method,allowing efficient coupling with arbitrary potential flow *** Order Spectrum is a pseudo-spectral,potential flow method for solving nonlinear free surface boundary conditions up to an arbitrary order of *** is capable of efficient long time nonlinear propagation of arbitrary input wave spectra,which can be used to obtain realistic extreme *** facilitate the coupling strategy,Higher Order Spectrum method is implemented in foam-extend alongside the CFD *** of the Higher Order Spectrum method is performed on three test cases including monochromatic and irregular wave ***,the coupling between Higher Order Spectrum and CFD is validated on three hour irregular wave ***,a simulation of a 3D extreme wave encountering a full scale container ship is shown.

关键词： Higher Order Spectral method irregular waves Extreme waves CFD Foam-extend

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

不规则波中多体三浮子波能转换器的优化设计

哈尔滨工程大学学报（英文版） 2023年第3期22卷 475-487页

作者： T.M.Ahmed A.R.Bassiouny K.A.Geba Y.Welaya Department of Naval Architecture and Marine Engineering Faculty of EngineeringAlexandria UniversityAlexandria 21544Egypt Petroleum Marine Services Co.(PMS) Alexandria 23722Egypt

A multi-body wave energy converter,consisting of three floats and modeled as a two body problem,is optimised to enhance its mean absorbed power using the Response Surface Optimisation *** optimisation focuses on two input parameters namely;the floats’diameters and the spacing,in various sea states and at different PTO dampings.A frequency domain analysis is performed for the WEC model scaled at 1∶50 in regular and irregular *** results are validated against numerical and experimental data available in the *** show good agreement against the unmoored model’s added mass,radiation damping,response amplitude operator,mean absorbed power and,capture width *** sea states selected for optimisation are represented by a JONSWAP wave spectrum with,a range of significant wave heights(0.04 to 0.06 m)and a range of peak periods(0.8 to 1.3 s).This corresponds to(2 to 3 m)significant wave heights and(5.6 to 9.2 s)peak periods in full *** show that the optimised WEC model demonstrates good and consistent enhancement of its mean absorbed power and capture width ratio.

关键词： Multi-body wave energy converter Capture width ratio irregular waves Power absorption Optimisation

Wave decomposition phenomenon and spectrum evolution over submerged bars

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2009年第3期28卷 82-92页

作者： LI Benxia YU Xiping National Marine Environmental Forecasting Center State Oceanic Administration Beijing 100081China Department of Hydraulic Engineering Tsinghua University Beijing 100084 China

Wave decomposition phenomenon and spectrum evolution over submerged bars are investigated by a previously developed numerical model. First, the computed free surface displacements of regular waves at various locations are compared with the available experimental data to confirm the validity of the numerical model, and satisfactory agreements are obtained. In addition, variations of decomposition characteristics with incident wave parameters and the change of energy spectrum for regular waves are also studied. Then the spectrum evolution of irregular waves over submerged bars, as well as the influence of incident peak wave period and the steepness of the front slope of the bar on spectrum evolution, is investigated. Wave decomposition and spectral shape are found to be significantly influenced by the incident wave conditions. When the upslope of the bar becomes 1：2, the length of the slope becomes shorter and will not benefit the generation of high frequency energy, so spectrum evolution is not significant.

关键词： wave decomposition spectrum evolution nonlinear waves irregular waves submerged bars

THE irregular BREAKING WAVE FORCES ON VERTICAL WALL

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 1997年第2期9卷 99-110页

作者： Li Yu-cheng, Liu Da-zhong, Su Shiao-jun, Qi Gui-pingDept. of Civil Engineering, Dalian.University of Technology, Dalian 116024, P. R. China

A method for the calculation of total horizontal wave forces by irregular breaking waves on vertical wall was developed by authors, which was based on physical model test, dimensionless analysis and assessment of real construction. The methods for the determination of pressure distribution of horizontal forces on vertical wall as well as u-plift forces on the bottom of wall are also given. The comparison between calculated results by this method and samples of real construction are very well.

关键词： irregular waves breaking waves wave forces

CHEBYSHEV FINITE SPECTRAL METHOD FOR 2-D EXTENDED BOUSSINESQ EQUATIONS

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2011年第1期23卷 1-11页

作者： LI Yok-sheung ZHAN Jie-min, SU Wei Department of Civil and Structural Engineering The Hong Kong Polytechnic University Hong Kong China Department of Applied Mechanics and Engineering Sun Yat-sen University Guangzhou 510275 China

In this article,an accurate Chebyshev finite spectral method for the 2-D extended Boussinesq equations is *** method combines the advantages of both the finite difference and spectral *** Adams-Bashforth predictor and the fourth-order Adams-Moulton corrector are adopted for the numerical solution of the governing differential *** efficient wave absorption strategy is also proposed to effectively absorb waves at outgoing wave boundaries and reflected waves from the interior of the computational domain due to barriers and bottom slopes at the incident wave boundary to avoid contamination of the specified incident wave *** proposed method is verified by a case where experimental data are available for comparison for both regular and irregular *** case is wave diffraction over a shoal reported by Vincent and *** results agree very well with the corresponding experimental data.

关键词： Chebyshev polynomial finite spectral method irregular waves

Coupling potential and viscous flow models with domain decomposition for wave propagations

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2022年第5期34卷 826-848页

作者： Wen-jie Zhong Wen-tao Wang De-cheng Wan Computational Marine Hydrodynamics Lab(CMHL) School of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai200240China China Ship Scientific Research Center Wuxi214082China

Either potential flow or viscous flow based model may be flawed for numerical wave *** two-way coupling of potential and viscous flow models with the domain decomposition utilizing respective strengths has been a trending research *** contrast to existing literatures in which closed source potential models were used,the widely used open source OceanWave3D,OpenFOAM-v2012 are used in the present *** innovative overlapping two-way coupling strategy is developed utilizing the ghost points in *** guarantee computational stability,a relaxation zone used both for outlet damping and data transfer is built over the overlapping region in *** free surface elevation in the relaxation zone is directly probed in OpenFOAM while the velocity potential is indirectly built upon its temporal variation which is calculated by the free surface boundary condition using the probed *** coupling is achieved based on the fourth-order Runge-Kutta(RK)*** two-and three-dimensional tests including linear,nonlinear,irregular,and multi-directional irregular waves,are *** effectiveness of the coupling procedure in bidirectional data transfer is fully demonstrated,and the model is validated to be accurate and efficient,thus providing a competitive alternative for ocean wave simulations.

关键词： Domain decomposition numerical wave tank potential/viscous flow coupling irregular waves wave-structure interaction