Showing papers in "Applied Ocean Research in 2018"

TL;DR: In this paper, an adaptive particle refinement (APR) was applied to reduce the computational cost of the δ+-SPH scheme for two and three dimensional (3D) water entry problems.

TL;DR: Wang et al. as mentioned in this paper proposed a blended TC wind model combining two datasets, which shows good capacity of the TC wind simulation, and applied the blended wind model is applied in TC wave simulations in the South China Sea and East China Sea (ECS) of 4 years (2011-2014).

TL;DR: The proposed deep learning–based dynamic model identification method is designed to capture higher-order dynamic behaviors that result from the coupling of hydrodynamics and actuator dynamics, and addresses problems such as the regression problem in machine learning.

TL;DR: In this article, a cylindrical oscillating water column (OWC) wave energy converter with double chambers is proposed to harvest the wave energy effectively in deep water, and an analytical model is developed to investigate its hydrodynamic characteristics based on the linear potential flow theory and eigenfunction expansion technique.

TL;DR: In this article, a finite volume method was adopted for discretization of the Navier-Stokes equations of the underwater explosion (UNDEX) bubble in free field using a compressible two-phase flow solver.

TL;DR: A novel methodology to conduct reliability analysis of moored floating structures using Bayesian network (BN) is proposed and can be employed to mitigate associated risk with marine structures brought about by stochastic hydrodynamic loads.

TL;DR: In this article, an improved Relaxation Zone (RZ) method has been implemented in the meshless SPH-based DualSPHysics model, where the movement of the fluid particles is controlled by correcting their orbital velocity by means of a weighting function in a specified generation area.

TL;DR: In this paper, a discrete element method with dilated polyhedral elements is developed to simulate the interaction between ice floes and the floating structure, and the 2D-Voronoi tessellation algorithm is adopted to generate polyhedral ice floe with a given ice thickness in broken ice field.

TL;DR: In this article, two equations are proposed to predict the mean velocity within the wake of a vertical-axis turbine, which is defined as the minimum velocity closest to the turbine downstream.

TL;DR: Results show that the opportunistic CBM strategy can be effective and is established in the wind power industry, and the expense comparison between onshore and offshore WTs demonstrates the importance of this method.

TL;DR: In this paper, a beam-column piezoelectric-based energy harvesting system is studied, which can be optimally used as an Ocean Wave Energy Harvester (OWEH).

TL;DR: A novel method for estimating the sea state parameters based on the heave, roll and pitch response of a vessel conducting station keeping automatically by a dynamic positioning system, i.e., without forward speed is presented.

TL;DR: The coupling of a Smoothed Particle Hydrodynamics (SPH) fluid solver with a general-purpose Differential Variational Inequality (DVI) based non-smooth multibody dynamics solver is detailed, allowing for efficient and accurate modeling of fluid-mechanism interactions, an ubiquitous scenario in natural and industrial settings.

TL;DR: In this paper, the cavity evolution mechanism and flow pattern at a low Froude number are analyzed and it is found that the multi-scale vortex structures around the cavity can be successfully captured by LES method.

TL;DR: In this paper, the authors used the Implicit Large Eddy Simulation on appropriate grid resolutions for tip vortex propagation, at least 32 cells per vortex diameter according to previous studies. But the simulation is not suitable for the case of high speed video recordings.

TL;DR: The model provides a method to link related issues of interest to the layout design, resulting in a practical subsea layout that can be used to more reliably estimate costs, more accurately describe multiphase flow and help in decision-making for flow assurance.

TL;DR: In this paper, a simplified scour model for a full-scale offshore wind turbine based on a tripod structure is proposed, taking into account both local scour and global scour.

TL;DR: It is proved that the proposed adaptive fuzzy output feedback controller can stabilize the vessel to desired equilibrium origin, while guaranteeing the uniform ultimate boundedness of all closed loop signals in the underactuated system.

TL;DR: In this article, a low-temperature rheological model was established by conducting Rheological tests of submarine mud flows from the northern continental slope of the South China Sea and introduced into the CFD numerical simulation.

TL;DR: In this paper, the authors developed a hybrid harmonic analysis and wavelet network (HA-and-WN) model for accurate sea water level prediction, which is used for safe marine navigation in shallow waters as well as for other marine operations.

TL;DR: In this article, a joint distribution of all relevant environmental parameters used in design of offshore structures including directional components is presented, along with a novel procedure for dependency modelling between wind and wind sea.

TL;DR: In this article, the authors investigated the undrained pullout capacity of a suction caisson in clays with homogeneous and linearly increasing strengths with depth by two-dimensional axisymmetric finite element analysis, considering the caisson aspect ratios, the complete range of adhesion factors at soil-caisson interface, and the full range of dimensionless strength gradients on the dimensionless pullout factor of SUCA.

TL;DR: In this paper, the authors focused on the hydrodynamic simulation of wave run-up and mainly sought to evaluate the importance of wave scattering types identified by Swanet al. (2005) and lateral progressive edge waves on nonlinear wave amplification around a single fixed cylinder.

TL;DR: In this article, the spatial variability of the long-term trends of significant wave height (SWH) in the Black Sea was estimated from normalized SWH (NSWH) data, for each month separately, by using two non-parametric methodologies; Line of best fit and the Theil-Sen estimator, and then mapped to show their spatial variability Maps were generated for both mean SWHs and 95th percentile SWH, the latter is considered to reflect the trends of the severe sea states.

TL;DR: In this paper, the effect of structural flexibility on the maximum wave energy conversion by two interconnected floaters is investigated, and the structural flexibility has a negative effect on the power capture performance for relatively large wave length but a positive influence for relatively small wave length.

TL;DR: In this paper, the authors considered two barges of different draughts in incident waves and compared the artificial viscous coefficient that indicates dissipation effects at the gap between them.

TL;DR: It is verified that the MOPSO-based dynamic routing algorithm in the AUV inspection system is not only able to estimate the feasible routes intelligently, but also identify features of underwater structures for the purpose of positioning.

TL;DR: In this article, the authors investigate whether the interference between the bow and aft shoulder waves or the interaction between bow and stern waves has a more dominant effect on the hydrodynamic behavior of a shallowly submerged submarine.

TL;DR: To improve the seakeeping performance of a trimaran in waves, a fast elitist non-dominated sorting genetic algorithm (NSGA-II) is adopted and a fast optimization method for the trimaran outrigger layout is proposed by combining NSGA- II with the 2.5D seakeeps predicting method.

TL;DR: In this paper, the authors conduct a numerical investigation on hydrodynamic load on a bridge deck due to joint action of solitary waves and currents, and find that, in a linearly pattern, a current in the wave direction leads to a higher maximum of the hydrodynamics force in the horizontal direction, and an opposite direction results in a lower maximum, while the behaviors of other characteristics of the force, including the maximum of its vertical component and the minimums of its horizontal and vertical components, become complicated and highly nonlinear.