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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Advanced Research in Ocean Engineering
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Journal DOI :
Korean Society of Ocean Engineers
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Volume & Issues
Volume 1, Issue 4 - Dec 2015
Volume 1, Issue 3 - Sep 2015
Volume 1, Issue 2 - Jun 2015
Volume 1, Issue 1 - Mar 2015
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SPH Modeling of Hydraulics and Erosion of HPTRM Levee
Li, Lin ; Rao, Xin ; Amini, Farshad ; Tang, Hongwu ;
Journal of Advanced Research in Ocean Engineering, volume 1, issue 1, 2015, Pages 1~13
DOI : 10.5574/JAROE.2015.1.1.001
Post-Katrina investigations revealed that most earthen levee damage occurred on the levee crest and landward-side slope as a result of either wave overtopping, storm surge overflow, or a combination of both. In this paper, combined wave overtopping and storm surge overflow of a levee embankment strengthened with high performance turf reinforcement mat (HPTRM) system was studied in a purely Lagrangian and meshless approach, two-dimensional smoothed particle hydrodynamics (SPH) model. After the SPH model is calibrated with full-scale overtopping test results, the overtopping discharge, flow thickness, flow velocity, average overtopping velocity, shear stress, and soil erosion rate are calculated. New equations are developed for average overtopping discharge. The shear stresses on landward-side slope are calculated and the characteristics of soil loss are given. Equations are also provided to estimate soil loss rate. The range of the application of these equations is discussed.
Development of Multidirectional Nonlinear Numerical Wave Tank by Naoe-FOAM-SJTU Solver
Cao, Hong-Jian ; Wan, De-Cheng ;
Journal of Advanced Research in Ocean Engineering, volume 1, issue 1, 2015, Pages 14~24
DOI : 10.5574/JAROE.2015.1.1.014
A three-dimensional multidirectional nonlinear numerical wave tank (NWT) based on the Navier-Stokes equations and the Finite Volume Method (FVM) is developed by using the two-phase hydrodynamic flow solver naoe-FOAM-SJTU based on the open source toolbox OpenFOAM. The free surface is capturing with the Volume Of Fluids (VOF). The directional wave including Stokes wave, solitary wave and nonlinear wave are simulated and verified. The multi-directional waves are also simulated with particular wave spectral such as JONSWAP and wave directional spreading function. The obtained numerical results show the capability of the solver to generate different type of multidirectional nonlinear waves accurately. Meanwhile, it implies that the presented NWT can easily extend to model the wave-structures interactions, which will be great help to the offshore structures design.
Study on Influence of Ship Speed on Local Ice Loads on Bow of the IBRV ARAON
Kim, Tae-Wook ; Choi, Kyungsik ; Lee, Jong-Hyun ; Lee, Tak-Kee ;
Journal of Advanced Research in Ocean Engineering, volume 1, issue 1, 2015, Pages 25~35
DOI : 10.5574/JAROE.2015.1.1.025
This study presents the analysis of relationship between ship speed and local ice load on the Korean Icebreaker ARAON. The relationship curves were made from the data obtained at two areas: the Arctic and the Antarctic; and for two operation condition: the icebreaking condition in sea ice trial and general operation in ice covered sea. The strain data were converted to the equivalent stress value, and the influence of ship speed on the local ice load was analyzed and compared each other. These analysis results are useful in working on a statistically valid hull design approach.
Finite Element Model to Simulate Crack Propagation Using Interface Elements and Its Verification in Tensile Test
Chu, Shi ; Yu, Luo ; Zhen, Chen ;
Journal of Advanced Research in Ocean Engineering, volume 1, issue 1, 2015, Pages 36~43
DOI : 10.5574/JAROE.2015.1.1.036
Since the crack generation and its propagation caused by welding defects is one of the main hull damage patterns, the simulation of crack propagation process has an important significance for ship safety. Based on interface element method, a finite element model to simulate crack propagation is studied in the paper. A Lennard-Jones type potential function is employed to define potential energy of the interface element. Tensile tests of steel flat plates with initial central crack are carried out. Surface energy density and spring critical stress that are suitable for the simulation of crack propagation are determined by comparing numerical calculation and tests results. Based on a large number of simulation results, the curve of simulation correction parameter plotted against the crack length is calculated.
Reflection and Dissipation Characteristics of Non-overtopping Quarter Circle Breakwater with Low-mound Rubble Base
Balakrishna, K ; Hegde, Arkal Vittal ; Binumol, S ;
Journal of Advanced Research in Ocean Engineering, volume 1, issue 1, 2015, Pages 44~54
DOI : 10.5574/JAROE.2015.1.1.044
Breakwaters are the coastal structures constructed either perpendicular (shore connected) or parallel (detached) to the coast. The main function of breakwater is to create a tranquil medium on its leeside by reflecting the waves and also dissipating the wave energy arriving from seaside, resulting in ease of manoeuvrability to boats or ships to their berthing places. Different types of breakwaters are being used at present, such as rubble mound breakwater, vertical wall type breakwater and composite breakwater. The objective of this paper is to investigate reflection coefficients (Kr) and dissipation (loss) coefficients (Kl) for physical models of Quarter circle caisson breakwater of three different radii of 0.550 m, 0.575 m and 0.600 m with S/D ratio of 2.5 (S=spacing between perforations, D=diameter of perforations). The models were tested in the monochromatic wave flume of the department, for different incident wave heights (Hi), Wave periods (T) and water depths (d). It was observed that reflection coefficient increased with increase in the wave steepness (Hi/gT2) and decreased with increase in depth parameter (d/gT2) and hs/d (Height of structure including rubble base/depth of water). The loss coefficient decreased with increase in the wave steepness and increased with increase in depth parameter and hs/d.
Analytical Discussion on Stochastic Hydrodynamic Modeling of Support Structure of HAWAII WTG Offshore Wind Turbine
Abaiee, M.M. ; Ahmadi, A. ; Ketabdari, M.J. ;
Journal of Advanced Research in Ocean Engineering, volume 1, issue 1, 2015, Pages 55~62
DOI : 10.5574/JAROE.2015.1.1.055
Floating structure such as tension leg platform, semi-submersible and spar are widely used in field of oil exploration and renewable energy system. All of these structures have the base cylinder support structure which have effective rule in overall dynamic of response. So the accurate and reliable modeling is needed for optimum design and understanding the physical background of these systems. The aim of this article is an analytical discussion on stochastic modeling of floating cylinder based support structure but an applicable one. Due to this a mathematical mass-damper-spring system of a floating cylinder of HAWAII WTG offshore wind as an applicable and innovative system is adopted to model a coupled degrees using random vibration in analytical way. A fully develop spectrum is adopted to solve the stochastic spectrum analytically by a proper approximation. Some acceptable assumption is adopted. The simplified but analytical and innovative hydrodynamic analysis of this study not only will help researcher to concentrate more physically on hydrodynamic analysis of floating structures but also can be useful for any quick, simplified and closed form analysis of a complicated problem in offshore engineering.
A Study on the Structural Analysis of Jacket Type of Substructure With respect to 5MW Offshore Wind Power Generation
Sun, Min-Young ; Lee, Ki-Yeol ; Moon, Byoung-Young ;
Journal of Advanced Research in Ocean Engineering, volume 1, issue 1, 2015, Pages 63~72
DOI : 10.5574/JAROE.2015.1.1.063
The currently applied structure and fatigue assessment of support structure for offshore wind energy converter was based on common design rules. The accurate evaluation for environments of sea floor as to installation of support structure, loads of generator, dynamic loads in operation, and offshore environmental loads might be an essential requirement to acquire a safety design for the substructure. This study aims at dedicating to offshore-relevant technology fields by suggesting design methods of structures and estimating their safety in relation to the structural analysis of the substructure requiring high safety to various environment conditions. Especially, with respect to 5MW Offshore Wind Power System, this study will provide information about major wind directions and duration in combination with the developing wave climate at the test field. In this study in the dynamic analysis for 5MW offshore wind power substructure which is considered to be proper in Korea, it is expected that reliability of domestic technology is confirmed with respect to its structural stability.