Showing papers in "Ocean Engineering in 2014"

TL;DR: In this article, the structure of the cavitating flow around a twisted hydrofoil was investigated numerically using the mass transfer cavitation model and the modified RNG k-e model with a local density correction for turbulent eddy viscosity.

TL;DR: In this paper, the authors present a review of the recent advances in the assessment of loads for ships and offshore structures with the aim to draw the overall technological landscape available for further understanding, validation and implementation by the academic and industrial communities.

TL;DR: In this article, OpenFOAM is applied to non-linear wave interactions with offshore structures for ranges of wave conditions, and the numerical results for wave interaction with a vertical surface piercing cylinder have been compared with physical experiments performed at Danish Hydraulic Institute (DHI).

TL;DR: In this paper, the authors presented a mathematical model of the hybrid-driven glider, an estimation of the hydrodynamics and an analysis of the motion control, and the simulation results demonstrated that the Neural Network Predictive Control (NNPC) produced better control performance than the performance of the MPC and LQR when dealing with disturbances.

TL;DR: In this paper, a time domain model is applied to a three-dimensional point absorber wave energy converter, where the relative velocities between the body and the waves increase, and the non-linear hydrostatic restoring moment is calculated by a cubic polynomial function fit to laboratory test results.

TL;DR: In this paper, the authors investigated the hydrodynamic performance of a pile-supported OWC structure as a breakwater, for which the air-flow through a small opening in the top cover contributes to energy extraction from waves and reduction in transmission coefficients.

TL;DR: In this paper, a 2 years natural seawater aging effect on injection-molded Flax/PLA biocomposite was investigated. And a linear relationship was observed between water uptake and loss of mechanical properties, since their mechanical properties (Young's modulus and tensile strength) are reduced with aging.

TL;DR: In this article, a numerical model is developed to study the wave propagation in the presence of a steady current flow, which is based on Reynolds-Averaged Navier-Stokes (RANS) equations with k − e turbulence closure scheme.

TL;DR: An identification algorithm for ship manoeuvring mathematical models has been developed in this paper, which is based on the classic genetic algorithm used for minimizing a distance between the reference and recovered time histories.

TL;DR: A new approach based on Theta* algorithm to create paths in real-time, considering both angular rate (yaw rate) and heading angle of unmanned surface vehicles (USVs) is suggested, and the results showed that the ARC-TheTA* algorithm is effective for global path planning of USVs.

TL;DR: In this article, a review of the available literature about deep-sea environment studies on corrosion of metals and alloys is presented, and some outlines of investigations on sunk objects are given.

TL;DR: In this paper, a Computational Fluid Dynamics (CFD) model was proposed to predict the effect of antifouling coatings on frictional resistance of a ship.

TL;DR: In this article, high-resolution finite element models of the ship-structure-soil interactions are developed to clarify the failure modes and dynamic interaction process of the pile-supported structures subjected to ship collisions.

TL;DR: In this paper, the hydrodynamic problem of the water impact of three-dimensional buoys is investigated by the explicit finite element method with an Arbitrary-Lagrangian Eulerian (ALE) solver.

TL;DR: In this paper, a study of the factors that influence array layout on wave energy farms is presented, where the WEC considered is a two-body heave converter extracted from Babarit et al. (2012).

TL;DR: In this paper, a commercial RANS solver in conjunction with the Schnerr-Sauer cavitation model was used to predict the tip and the tip leakage vortex cavitation.

TL;DR: In this paper, a methodology for computation of flow around circular cylinders is developed and tested using prominent commercial and open-source solvers; ANSYS ® CFX-13.0 and OpenFOAM ® 1.7.

TL;DR: In this paper, an optimal and efficient path planner based on a shell space decomposition (SSD) scheme for autonomous underwater vehicles (AUVs) operating in cluttered and uncertain environments is presented.

TL;DR: In this paper, the authors proposed an analytic approach to accident risk modelling when data for analyzing safety factors is limited or unavailable, which is applicable to any type of marine accident or marine transportation system.

TL;DR: In this paper, a Suezmax tanker powered by the Gen4Energy 70MW Small Modular Reactor (SMR) is proposed for the purpose of demonstrating the technical feasibility of using nuclear energy on ocean-going vessels.

TL;DR: In this paper, the vortex-induced vibrations of a long flexible pipe conveying fluctuating flows are investigated via a two-mode discretization of the governing differential equations, which are then analyzed numerically for the pipe with principal parametric resonances during lock-in for each of the first two modes.

TL;DR: In this article, the authors present a nonlinear multi-body dynamic model for an underwater glider operating in an unsteady, nonuniform flow, which incorporates a cylindrically actuated moving mass, a common glider actuation scheme.

TL;DR: In this article, the first integral method was applied to obtain exact 1-soliton solutions for each Boussinesq-like equation, and the solution of these equations was shown to be 1-solomon.

TL;DR: In this article, a theoretical analysis to the requirements and an explanation to the feasibilities of physical modelling/scaling, and some important scaling issues on physical modelling of wave energy converters, are presented with an emphasis on the physical modelling and scaling of power take-off systems.

TL;DR: In this paper, the results of wave flume experiments for the process of a silty sediment bed responded to wave action were presented, which indicated that the movements of the suspended sediments were dominated by the re-suspension of surface sediment erosion at the initial stage of wave action, whereas the suspended sediment were transported from the internal seabed sediment upward due to wave-induced liquefaction and seepage at a later stage.

TL;DR: In this article, the capacity of a wide-shallow bucket foundation was determined by the displacement of the bucket and the corresponding load under a vertical displacement of 0.06D. The vertical loading had an amplification effect on the horizontal load-bearing and moment capacity.

TL;DR: In this article, a horizontal perforated plate was designed and incorporated into a rectangular liquid tank in order to increase energy dissipation and reduce the forces acting on structures, and the experimental results indicate that the horizontal perfused plate can significantly restrain violent resonant sloshing in the tank under horizontal excitation.

TL;DR: In this paper, the SWAN model is applied to investigate the wave characteristics in Bohai Sea for the period from 1993 to 2012, and the temporal and spatial distribution of wave height, averaged period and wave direction were analyzed.

TL;DR: In this paper, two state-of-the-art wave models viz; WAVEWATCH III (WW3) and Simulating WAves Nearshore (SWAN) are nested and forced with French Research Institute for Exploitation of the Sea/Laboratory of Oceanography From Space (IFREMER/CERSAT) blended surface winds.

TL;DR: In this paper, the effect of rotational friction on the stability of a VIV suppressor was investigated on a free-to-rotate short-tail fairing fitted to a rigid length of circular cylinder.