Showing papers in "Applied Ocean Research in 2016"

TL;DR: A new algorithm named the ‘angle-guidance fast marching square’ (AFMS) is presented, to make the generated path compliant with vehicle's dynamics and orientation restrictions, and a novel priority scheme based upon the distance to the closest point of approaching (DCPA) has been proposed and developed.

TL;DR: In this article, an overview of emission control based energy efficiency measures in the ship operation phase with respect to possible energy conservation situations is presented, and the possibilities of using appropriate navigation strategies (i.e., voyage planning, and draft and trim optimization) especially in designated ECAs to reduce exhaust emissions (e.g., CO2, SOx and NOx) are also discussed.

TL;DR: In this article, a three-dimensional hydrodynamic and salinity transport model, with a high resolution unstructured mesh and spatially varying bottom roughness, is applied to quantify the influences of SLR on saline water intrusion in the Yangtze River Estuary (YRE).

TL;DR: In this paper, the initial deadrise angles of the wedges were 20° and 30° with inclination angles ranging from 0° to 15° in 5° increments and the sampling rate of measurements were set to 25 KHz.

TL;DR: In this article, the authors used a coupled multimodal method and scaled boundary finite element method (SBFEM) to estimate the velocity potential of a partially-filled cylindrical tank with multi baffles.

TL;DR: In this article, the estimation of the damping introduced by bilge keel is still largely based on empirical methods, however, the authors adopt the CFD approach to the estimation and validate the results with experiments conducted in a wave flume.

TL;DR: In this paper, a design by optimization of contracted and tip-loaded (CLT) propellers is proposed and implemented based on a parametric description of the propeller blade, derived from the usual design table by using B-spline parametric curves, and an in-house developed Panel Method/Boundary Element Method (BEM) aimed to evaluate the performance (including cavitation) of propellers selected by a genetic optimization algorithm.

TL;DR: Simulation-based design optimization methods integrate computer simulations, design modification tools, and optimization algorithms and show a faster convergence towards the global minimum than the original global methods and are a viable option for ship hydrodynamic optimization.

TL;DR: In this paper, a modified tip-loaded propeller was designed via an optimization strategy using a Boundary Elements Method (BEM), a custom parametric description of the unconventional blade geometry and an optimization algorithm (of genetic type) within the mode-fronter environment.

TL;DR: In this article, the results of crown displacement and hydraulic pressure of the monitoring sections in the physical model and numerical model were analyzed to study the water inrush mechanism in the faults, both physical model test and numerical analysis were carried out.

TL;DR: In this paper, the effects of different helical strake coverage on the vortex-induced vibration (VIV) of a model flexible riser were studied experimentally, with the aim of further improving the understanding of VIV responses.

TL;DR: In this article, the authors proposed a methodological extension of human error assessment and reduction technique (HEART) by incorporating interval type-2 fuzzy sets which overcome more of the uncertainty of experts' judgement and expression in decision-making.

TL;DR: Based on a parallel SPH-LES model, a three dimensional numerical wave basin is developed to study wave interaction with coastal structures in this article, where OpenMP programming technology combined with an existing MPI program contained in the parallel version of SPHysics code has been implemented to enable the simulation of hundred millions of particles running on a computer cluster.

TL;DR: In this paper, the Bragg reflection of water waves by multiple submerged semi-circular breakwaters was examined and the multipole expansions combined with the shift of polar coordinates were used to develop full linear potential solutions of the problem.

TL;DR: In this paper, the authors analyzed the flow around a marine propeller ducted with a so-called decelerating nozzle both through the axial momentum theory and the nonlinear semi-analytical actuator disk model.

TL;DR: Based on the coupled Eulerian-Lagrangian approach, a numerical framework is proposed in this paper to predict the embedment depth of GIAs, considering the effects of soil strain rate, soil strain-softening and hydrodynamic drag (modeled using a concentrated force), with the anchor-soil friction described appropriately.

TL;DR: In this paper, the authors presented dynamical modeling and robust control of a Mini Unmanned Underwater Vehicle (MUUV) equipped with a new arrangement of water jet propulsion.

TL;DR: In this paper, the effects of the load speed, width and depth of the channel on the hydroelastic response of the ice cover were studied in detail, and it was shown that the models of ice response without hydrodynamic component of the pressure provided correct stresses in the ice sheet only for very low speeds of the moving load.

TL;DR: From the results it can be concluded that the Neuro Wavelet Technique can be employed to solve the ever eluding problem of accurate forecasting of the extreme events.

TL;DR: In this article, a hybrid intelligent method based on combination of group method of data handling (GMDH) and harmony search (HS) optimization method which is called GMDH-HS has been developed for suction caisson uplift capacity prediction.

TL;DR: In this paper, a simple method to determine the mesh size for numerical simulations of near field underwater explosion is proposed, which is suitable for various charge weights and is based on the numerical study, defined as the ratio of the radius of charge to the side length of element, is introduced to be the criterion for determining mesh size in simulations.

TL;DR: In this paper, the authors describe model tests of a tanker with two fixed bow-mounted foils (wavefoils) for resistance and motion reduction in waves, and show that employing the wavefoils reduced ship resistance by 9-17% according to scaled model test resistance.

TL;DR: In this paper, the buckling or collapse of offshore pipelines under external hydrostatic pressure was investigated. And the elastic-plastic collapse pressure could be treated as the least root of an elementary function.

TL;DR: In this paper, a set of parameters, characterising a given wave spectrum is estimated through an optimisation problem using global search basin with proper constraints, and a partitioning procedure is applied, which is able to separate swell components from wind seas.

TL;DR: In this article, a large-eddy simulation of turbulent flow past a circular cylinder at sub- to supercritical Reynolds numbers is performed using a high-fidelity orthogonal curvilinear grid solver.

TL;DR: In this article, a large deformation finite element (FE) analysis employing the coupled Eulerian-Lagrangian technique is performed to simulate the installation/mooring line, and then is applied to analyzing comprehensive anchor behaviors in the seabed.

TL;DR: In this article, an Eulerian-Lagrangian CFD model is presented, which accounts for relevant physics including buoyancy, turbulence, gas expansion and gas dissolution.

TL;DR: In this paper, a mathematical model based on 2D-asymmetric wedge water entry to model heave and pitch motions of planing hulls at non-zero heel angles is presented.

TL;DR: In this paper, a nonlinear parallel spring-damper scalar element with a rigid beam element is used to represent drilling riser tensioner behavior during an emergency disconnection scenario in global riser analysis.

TL;DR: In this paper, a cylindrical oscillating water column (OWC) device with a quadratic power take-off (PTO) model was studied experimentally and theoretically.