Showing papers in "Ocean Engineering in 1995"

TL;DR: In this article, the two-dimensional nonlinear time domain free surface flow problem is analyzed using potential flow theory and the problem is solved by a time marching method, where two numerical approaches are used at each time step.

TL;DR: In this article, the absorption of energy by a mooring system from an offshore platform as a result of its motion is investigated, and the results include variations in pretension, amplitude, frequency, scope, stiffness, drag coefficient and current.

TL;DR: In this article, the potential of liquefaction under the action of such a wave system is evaluated for the regions in the seabed fronting a breakwater, including reflection coefficient, relative water depth, degree of soil saturation and soil permeability.

TL;DR: In this article, the maximum and bottom impact pressure on a wall is treated statistically and the effects of the wall angle and foreshore slope on these two quantities are examined, and the results show that for practical applications, the still-water level can be taken as the acting place for the maximum pressure on the wall.

TL;DR: In this paper, an analytic solution to the heave radiation problem of a rectangular structure is presented, where the nonhomogeneous boundary value problem is linearly decomposed into homogeneous ones.

TL;DR: In this article, a Monte-Carlo simulation technique is used to evaluate the suitability of proposed techniques for the estimation of the spectral peak frequency in terms of the probability density functions for such estimates.

TL;DR: In this paper, the pore pressure response within a porous seabed induced by the standing wave is analyzed using Biot's theory of consolidation, and experiments for the response are also conducted in a wave flume.

TL;DR: In this article, the authors evaluated the hydrodynamic performance of a wave-driven artificial upwelling device in ocean waves off the Hawaiian islands, which consisted of a buoy and a tail pipe with a flow controlling valve.

TL;DR: In this paper, a computer program was developed to analyse in the time domain the equation of motion of a crane vessel and its suspended load, described by the six rigid body degrees of freedom of the vessel, together with the three orthogonal displacements of the lift mass.

TL;DR: In this article, a model study has been carried out to investigate the slamming effect on horizontal slabs using regular waves at different frequencies with the measurement of vertical forces, and a modified slamming coefficient independent of frequency has been suggested to be used conveniently for design purposes.

TL;DR: In this article, a 1/36 two-dimensional model of the Islay prototype wave power station was used to assess the influence of geometry changes on the hydraulic performance, and it was found that large vortices developed around the comparatively thin front wall for in- and outflow and internal sloshing occurs during the inflow period.

TL;DR: In this paper, an adaptive autopilot for submarines via gain scheduling is introduced, which is based on the stochastic controller and observer techniques, and is designed to operate in various sea conditions.

TL;DR: In this article, a complete solution is presented in closed-form for the velocity potential, up to the second-order of wave amplitude, of the non-linear short-crested waves being diffracted by a vertical cylinder.

TL;DR: In this article, a simple method is proposed to decompose the composite wave record obtained from the wave reflection experiments in the wave flume, and the results obtained by the proposed method are compared with the two and three probe methods.

TL;DR: In this article, the authors present a comprehensive critical survey of all the classical planing data, and identify some of the anomalous variations between experimenters, as well as some modifications made to coefficients employed in the "added mass" equations for planing forces given in earlier papers.

TL;DR: In this paper, a series of large-scale experiments were conducted to examine the motions of buoys in a variety of wave climates, and numerical simulations of selected tests are conducted to test the present ability of a particular computer program to model buoy responses.

TL;DR: In this paper, the authors present a review of recent developments in this area, which consists, essentially, in a nonlinear optimization process of the coordinate functions in a global sense.

TL;DR: In this paper, the case of vibrating circular plates of linearly varying thickness is tackled using a method proposed by Bellman in the early 1970s, and the authors show that the method can be applied to a wide range of applications.

TL;DR: In this paper, a 1:50 scale model of a big offshore gravity platform was placed off the beach at Reggio-Calabria, where the wind waves typically have significant height ranging from 0.20 to 0.40 m and peak period from 1.8 to 2.6 sec.

TL;DR: In this paper, the energy density, the energy flux, the set-down, the radiation stress, and some wave energy velocities have been derived correct to fourth order in wave steepness for waves on a vorticity-free current.

TL;DR: In this article, the standing wave pressures due to laboratory-generated regular and random waves exerted on a vertical wall were measured in a wave flume, at four relative depths of submergence on the test model.

TL;DR: In this article, the motions of the model platform under intact, progressive flooding and post flooding conditions were carried out under two wave heading angles, head and beam seas, and the motion experiments were repeated for two different GMs.

TL;DR: In this paper, two numerical simulation models to predict large-amplitude motions of floating platforms are presented, one based on the relative-velocity formulation of Morison's equation for force calculations and the other based on three-dimensional potential theory in time domain.

TL;DR: In this paper, physical model tests were conducted to validate numerical models of moored-buoy systems and three buoy types (sphere, spar and discus) were tested for intrinsic properties, three-dimensional impulse response and threedimensional dynamic response to two-dimensional regular and random wave excitation.

TL;DR: In this article, the hydrodynamics forces acting on a low-drag submersible were measured, and a significant reduction in drag was found compared with standard turbulent submersibles.

TL;DR: In this article, the dynamic forces of sea water and backfill soil acting on coastal embankments and the hydrodynamic forces on offshore breakwaters have been analyzed using a finite-difference scheme.

TL;DR: In this paper, the behavior of a highly deformable membrane to ocean waves was studied by coupling a nonlinear boundary element model of the fluid domain to a finite element model for the membrane.

TL;DR: In this article, the title problem is solved by an approach first suggested by Bellman early in the 1970s and which has recently been used in the solution of solid mechanics problems.

TL;DR: In this article, the variation of the dynamic pressures around a circular cylinder due to regular waves was studied in a wave basin of constant water depth of 3 m. The measuring segment consisted of 12 pressure transducers placed at an elevation of 0.8 m below the still water level.

TL;DR: In this article, the natural frequencies and buckling loads of circular plates with stepped thickness over a concentric circular region were determined using the optimized Rayleigh-Ritz method for the case of edges elastically restrained against rotation and translation.