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Showing papers in "Ocean Engineering in 1989"


Journal ArticleDOI
TL;DR: The results of a comprehensive field trial of nearly all commercially available directional wave measurement systems at the Edda field in the North Sea during winter 1985-86 are presented in this paper.

109 citations


Journal ArticleDOI
TL;DR: In this article, a double bounded probability density function is used to describe the ocean wave statistics and estimate the most probable maximum wave height for offshore structural designs, where the wave height is defined as the probability that the wave reaches a given height.

49 citations


Journal ArticleDOI
TL;DR: In this article, an approximate method is utilized to investigate the hydrodynamic interactions between the members of an array of floating circular cylinders which occur when one member undergoes prescribed forced oscillations.

43 citations


Journal ArticleDOI
TL;DR: In this paper, a theoretical model which describes the motion in combined wave and current boundary layers near fixed rough seabeds is presented, which can be used to derive a defined velocity load on a pipeline resting on a sea bottom in a combined wave-current environment.

38 citations


Journal ArticleDOI
TL;DR: In this paper, it is shown that the mean direction θ M 1 is robust against the presence of noise, but that s 1 and σ are very sensitive to it.

35 citations


Journal ArticleDOI
TL;DR: In this paper, the authors investigated the angle dependence of the roll damping moment by analysing experimentally obtained free roll decay records and showed strong angle dependence and explains why the quadratic and cubic velocity dependent damping moments are successful in many cases.

35 citations


Journal ArticleDOI
TL;DR: In this article, the dynamic pressure distribution around a large vertical cylinder resting on a flume bed and piercing the free surface subjected to regular waves have been carried out in a 4-m wide wave flume in a constant water depth of 2.5 m at Ocean Engineering Centre, Indian Institute of Technology, Madras, India.

24 citations


Journal ArticleDOI
TL;DR: In this article, the effect of wave upwelling on the local wave height and other kinematic quantities was analyzed theoretically by using a high order hybrid element technique, and the results were presented as contour plots and isometrics of local free surface amplitudes in regular waves.

16 citations


Journal ArticleDOI
K.H. Kwik1
TL;DR: In this article, the moment at which a collision avoidance manoeuvre should be initiated in order to achieve a specific distance at the closest point of approach has been calculated based on the kinematics of encounter and simplified equations of motion.

15 citations


Journal ArticleDOI
TL;DR: In this paper, a method for the nonlinear analysis of marine risers excited by single regular waves and steady current is presented, and the coefficients of the first-order Fourier expansion are derived.

13 citations


Journal ArticleDOI
TL;DR: In this article, a model is formulated to predict wave-induced flows and pressures in rubble toes fronting a seawall or caisson, based on the linearized Forchheimer equation of fluid motion in the coarse, granular medium.

Journal ArticleDOI
TL;DR: In this article, the effect of the Lighthill correction on the estimation of the hydrodynamic damping force was examined for both the periodic and random wave conditions, and it was shown that the effect was negligible.

Journal ArticleDOI
TL;DR: In this article, a video imaging technique is employed in a towing basin to obtain high resolution surface Lagrangian velocity observations in the centerline wake region of a high speed, twin screw surface vessel.

Journal ArticleDOI
TL;DR: In this paper, the large motions that a compliant offshore structure experiences were analyzed using Euler parameters, and the hydrodynamic forces acting on the structure were calculated using the modified Morison's equation.

Journal ArticleDOI
TL;DR: In this paper, an experimental investigation has been made of the fluid forces acting on a circular cylinder oscillating in line with a uniform flow, and the in-line forces were determined from measurements of the ensemble-averaged, cyclic pressure distribution.

Journal ArticleDOI
TL;DR: In this paper, a three-dimensional numerical technique was developed for determining the wave-exciting and motion-induced hydrodynamic forces for fixed and floating structures in a fluid of finite or infinite depth.


Journal ArticleDOI
TL;DR: In this article, a scaling law is derived which enables the collapse of the data into a single curve representing the surface tension values at a given speed, which forms the basis for understanding the behavior of the spray sheet.

Journal ArticleDOI
TL;DR: In this article, the response of a long towed pipeline to random spreading seas is considered and an analytical technique is presented in which the response is calculated and then modified to incorporate the relevant boundary conditions.

Journal ArticleDOI
TL;DR: In this article, the potential solutions for a half-cylinder and semicircular shell are considered in detail and evaluated in the case of deep submergence, and the effect of introducing vorticity at the edges of the shell is investigated.

Journal ArticleDOI
TL;DR: In this paper, the authors used the TAAS (Towed Acoustic Array Simulation) computer program, previously used to calculate the large-scale, three dimensional dynamic behavior of series-connected marine structures, to simulate the reaction of a cable-towed weight to small scale transverse sinusoidal oscillations superimposed upon steady towing.

Journal ArticleDOI
TL;DR: In this paper, an empirical relation between m 4 and the significant wave parameters H s and T s is suggested, which enables m 4 to be estimated for each sea state in an H s −T s diagram, and consequently the number of breaking wave crests above any specified value is easily calculated.

Journal ArticleDOI
R. E. Salomon1
TL;DR: In this article, a device for converting ocean wave energy into electricity utilizing a rocking buoy and a hydrogen pressure cell is described, where the moored buoy contains a pneumatic tube filled with a dense liquid which rocks back and forth as a result of the ocean wave activity.

Journal ArticleDOI
TL;DR: In this article, a generalization of geometrical similarity aimed at predicting the traverse righting arm reduction in a longitudinal wave is presented, applied to D.T.M.B.'s standard Series 60.

Journal ArticleDOI
TL;DR: In this paper, an eigenfunction expansion technique was used to investigate the linear wave field produced by a spiral wavemaker consisting of an eccentrically-mounted, right circular cylinder rotating at a constant angular velocity in a basin of arbitrary uniform depth.

Journal ArticleDOI
TL;DR: In this paper, a numerical time domain solution of the equations of motion for predicting the fall dynamics of a free-fall vehicle is developed, and a correlation study based on experimental data obtained from physical model wind tunnel tests, limited insitu data, and the analytical model are presented.

Journal ArticleDOI
TL;DR: In this article, an approximate method for computing the wave forces on an array of vertical cylinders was proposed and applied by McIver and Evans (1984) for a group of five cylinders.

Journal ArticleDOI
TL;DR: In this article, a mathematical model is proposed which gives operational criteria for the construction of ice platforms by water flooding and spraying, based on the one-dimensional heat conduction equation.

Journal ArticleDOI
TL;DR: In this paper, a review of the available approximation techniques in the response computation and the limits of their applicability in a design situation is presented so that a designer may evaluate the suitability of a method in a particular design condition.

Journal ArticleDOI
TL;DR: In this article, the authors measured wave statistics recorded by a vector-average current meter over a two-week period and compared to independently measured wave data for a wavedominated shallow lake at two depths.