Showing papers in "Ocean Engineering in 2002"

TL;DR: In this paper, a nonlinear liquid sloshing inside a partially filled rectangular tank has been investigated, where the fluid is assumed to be homogeneous, isotropic, viscous, Newtonian and exhibit only limited compressibility.

TL;DR: The numerical results indicate that the hourly tidal levels over a long duration can be predicted using a short-term hourly tidal record.

TL;DR: In this article, a set of available freak wave measurements gathered from several periods of continuous wave recordings made in the Sea of Japan during 1986-1990 by the Ship Research Institute of Japan was analyzed.

TL;DR: This paper attempts to forecast the waves based on learning the characteristics of observed waves, rather than the use of the wind information, and shows that the ANN model performs well for both wave forecasting and data supplement when using a short-term observed wave data.

TL;DR: In this article, the authors investigated the influence of the turbine aerodynamic design on the overall plant performance, as affected by the turbine peak efficiency and the range of flow rates within which the turbine can operate efficiently.

TL;DR: In this paper, the problem of simulating the ship motion is studied mainly in connection with manoeuvring simulators and several possible levels of solution to the problem with different degrees of complexity and accuracy are discussed.

TL;DR: In this paper, a systematic study of breaker shapes and wave impact pressures on a vertical wall using a newly developed experimental technique, sequential flash photography, was conducted at Queen's University of Belfast.

TL;DR: In this paper, the hydrodynamic performance of the oscillating water column type shoreline-mounted wave power device is numerically studied within linear wave theory by using a boundary element method based on the Wehausen and Laitone 3D shallow water Green's function.

TL;DR: The SWAN wave model is typically designed for wave simulations in the near-shore region and thus is selected for evaluating its applicability on typhoon waves in the coastal waters around Taiwan Island as discussed by the authors.

TL;DR: In this paper, a dynamic analysis of a triangular tension leg platform (TLP) to regular waves is presented, considering the coupling between surge, sway, heave, roll, pitch and yaw degrees of freedom.

TL;DR: The use of lime to improve the behavior of soft clays is not new. as mentioned in this paper examined lime-induced changes in the compressibility of marine clay and found that a reduction of 1/2 to 1/3 in the soil system within 30 to 45 days of treatment.

TL;DR: In this paper, the wave transmission, reflection and energy dissipation characteristics of partially submerged T-type breakwaters were studied using physical models using regular and random waves, with wide ranges of wave heights and periods and a constant water depth.

TL;DR: In this paper, an on-board, actively controlled motion-compensated platform is used as a reference (active reference) for power absorption and latching on a floating wave energy converter in deep water.

TL;DR: In this paper, a numerical analysis of lateral responses of a long slender marine structure under combined parametric and forcing excitations is presented, showing that the response amplitude of a combined excitation is much greater than that of a conventional forcing excitation in the instability regions of the Mathieu stability chart.

TL;DR: In this paper, a three-dimensional Lump-Mass formulation of a catenary riser, capable of handling irregular seabed interaction, with bending and torsional stiffness is presented, using only three degrees of translational freedom and one independent torque variable for each computational node.

TL;DR: In this article, a neural network technique is developed for identifying the damage occurrence in the side shell of a ship's structure, which is modeled as a stiffened plate and the output is a single function G r z r, z r which was formed by adding together the damping and a part of the restoring forces.

TL;DR: In this article, the authors reduce the diffusiveness of the SWAN model by replacing the existing numerical scheme with two alternative higher order schemes, a scheme intended for stationary, small-scale computations, and a scheme that is most appropriate for nonstationary computations.

TL;DR: In this paper, a time-domain higher-order boundary element scheme was used to simulate the linear and nonlinear irregular waves and diffraction due to a structure, and the results were verified by checking the accuracy of the nonlinear simulation.

TL;DR: In this article, numerical simulations of gravity waves with high-order nonlinearities in two-dimensional domain are performed by using the pseudo spectral method, which increases kurtosis, wave height distribution and H max /H 1/3 in deep water and decreases these wave statistics in shallow water.

TL;DR: In this article, a theoretical analysis of the ocean wave energy absorption by a periodic linear array of oscillating water columns (OWCs) of arbitrary plan-form is presented based on classical linear water wave theory and uses the expressions for the wave field resulting from timeharmonic pressure distributions on the free surface.

TL;DR: In this article, the wave transmission, reflection and energy dissipation characteristics of partially immersed twin vertical barriers and the water surface fluctuations in between the barriers were studied using physical models, and it was found in general that the twin barrier is better in reducing the coefficient of transmission and increasing the coefficients of dissipation in random waves than with the regular waves, especially for increasing incident wave energy levels.

TL;DR: Time-domain computations of 3D ship motions with forward speed are presented in this article, where both linear and nonlinear computations are performed where the included nonlinearities are those arising from the incident wave, but the diffraction and radiation forces are otherwise retained as linear.

TL;DR: In this article, a small-scale laboratory experiment was conducted to quantify a transient wave overtopping a horizontal, deck fixed above the free surface, and detailed free surface and velocity measurements were made for two cases with and without the deck structure to quantify the effect of the deck on wave kinematics.

TL;DR: In this paper, the wave height distribution with Edgeworth's form of a cumulative expansion of probability density function (PDF) of surface elevation is investigated, and the results show that a non-Gaussian model of wave distribution reasonably agrees with experimental data.

TL;DR: In this article, a comparison of four different numerical wave prediction models for hindcast wave conditions in Lake Michigan during a 10-day episode in October 1988 is presented, and the results show that while the individual model predictions deviate from the measurements by various amounts, they all tend to reflect the general trend and patterns of the wave measurements.

TL;DR: In this article, the wave transmission, reflection and energy dissipation characteristics of breakwaters were studied using physical models, and it was found that wave transmission is significantly reduced with increased relative water depth, d / L, whether the vertical barrier of the breakwater is surface piercing or submerged, where d is the water depth and L is the wave length.

TL;DR: In this article, an attempt has been made to investigate the lime induced permeability changes in the permeability and engineering behavior of different lime column treated soil systems, showing an increase in permeability up to a maximum value of 15-18 times that of untreated soil with time.

TL;DR: The longitudinal stability characteristics of a wing-in-ground (WIG) effect craft are quite different from those of the conventional airplane due to the existence of force and moment derivatives with regard to height as mentioned in this paper.

TL;DR: The models appropriate for the dynamic assessment of jack-ups, concentrating particularly on the long-term response due to random ocean waves and on work-hardening plasticity models used for spud-can response, are concerned.

TL;DR: In this article, the effect of coupling of various structural degrees of freedom (surge, sway, heave, roll, pitch and yaw) on the dynamic response of a TLP under random wave loads is studied.