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Showing papers in "Ocean Engineering in 1983"


Journal ArticleDOI
TL;DR: A fully three-dimensional code has been written to compute the motion of a towed cable based on a robust and stable finite difference approximation to the differential equations derived from basic dynamics.

231 citations


Journal ArticleDOI
TL;DR: In this paper, a rotating and translating wave board is proposed to suppress spurious long waves in the second order wave generation process, where the boundary conditions at the wave board are not fulfilled for the bounded long waves, and consequently various spurious, free long waves are unintentionally produced.

74 citations


Journal ArticleDOI
TL;DR: In this paper, a numerical method for the dynamic simulation of towed cables is presented, where the cable is loaded by fluid drag, tension, gravity and buoyancy, including the effects of weights and floats.

45 citations


Journal ArticleDOI
TL;DR: In this paper, a generalized representation for a wind-wave frequency spectrum was proposed, where E = ∫S(f) d f is the variance of the surface displacement; f m is the frequency of the spectral peak; and C i's, i = 1,2,3, are dimensionless parameters that can be determined from the internal spectral parameters of a given spectrum.

29 citations


Journal ArticleDOI
TL;DR: In this article, a general method for investigating the extreme values of certain types of stochastic processes is described through the study of Morison-type wave loading on piles, and the expected largest value of the loading function during a given time interval has been calculated.

29 citations


Journal ArticleDOI
M. Aziz Tayfun1
TL;DR: In this paper, a theoretical expression for the joint distribution of crest-to-trough wave heights and zero up-crossing periods is developed from a modified extension of presently available results relevant to wave envelopes and periods under narrowband conditions.

28 citations


Journal ArticleDOI
TL;DR: In this paper, methods for estimating the parameters of the Fisher-Tippet Type 1 extreme value distribution and associated return values from measured extremes, such as maximum wave height, were described.

26 citations


Journal ArticleDOI
TL;DR: An overview of the development of a carbon dioxide removal plant for submarines to meet the U.S. Navy's operational and safety requirements is presented in this article, where the monoethanolamine -CO2 removal process and parametric studies to reduce atmospheric CO2 levels in submarines to 0.5% and possibly 0.2% are discussed.

24 citations


Journal ArticleDOI
TL;DR: In this paper, the effects of free-stream turbulence on the drag of circular cylinders are reviewed and some possible sources of errors or discrepancies in this data are examined, and likely influences of various turbulence parameters on shear-layer phenomena are suggested, including early transition, increased entrainment and vorticity amplification.

17 citations


Journal ArticleDOI
P.J. Wingham1
TL;DR: In this article, the effect of cable inclination angle has been studied and an empirical rule developed for dealing with faired cables, the hydrodynamic properties of which are shown to depend significantly on the section shape of the fairing.

16 citations


Journal ArticleDOI
M. Aziz Tayfun1
TL;DR: In this article, the statistical distribution of the crest-to-trough heights of narrowband nonlinear sea waves is derived in a semi-closed form, and a quantitative comparison of the resulting density and exceedance probability distributions with those of the linear theory is given.


Journal ArticleDOI
Zeki Demirbilek1
TL;DR: In this article, the authors introduced a linear theory of viscous liquid sloshing and formulates a boundary value problem subject to appropriate conditions, which is solved by the truncation of infinite series.

Journal ArticleDOI
Zeki Demirbilek1
TL;DR: In this paper, the authors investigated the effects of three important parameters of sloshing in a rectangular tank: Reynolds number, the Froude number, and the aspect ratio.


Journal ArticleDOI
TL;DR: In this article, a moment method for analysing the stochastic stability of the surge motion of a tethered buoyant platform (TBP) in a random sea is examined, and criteria for stability are obtained in terms of the damping coefficient and the auto-correlation function of the random sea.

Journal ArticleDOI
Zeki Demirbilek1
TL;DR: In this article, a truncated infinite Fourier series-type solution is adopted for the linearized boundary value problem, which is mathematically consistent and represents the phenomenon properly by satisfying all of the field equations and the imposed boundary conditions.

Journal ArticleDOI
TL;DR: The Nature Conservancy Council has carried out appraisals for the Department of Energy of environmental implications of siting full-scale floating or seabed-mounted wave energy converters off the west coast of the Outer Hebrides and fullscale floating devices off the Moray Firth as discussed by the authors.

Journal ArticleDOI
TL;DR: In this article, a series of model experiments with a twin-flap wave energy absorbing device is described, and the results compared with numerical predictions based on theoretical work reported by Srokosz and Evans (1979).

Journal ArticleDOI
TL;DR: In this article, the authors derived the potential energy of a two-dimensional progressive water wave based on the first law of thermodynamics and the linearized velocity potential for waves, and derived the energy densities and total energy expressions for deep and finite depth water waves.

Journal ArticleDOI
TL;DR: In this article, a small, inexpensive, and easily deployable meteorological buoy is described, which is greatly reduced by appropriate ballast techniques; vector averaging further removes buoy motion effects from wind data.

Journal ArticleDOI
TL;DR: In this article, a motion-compensation system for use with towed instrumentation that eliminates shock loading and minimizes depth variation is presented. But the system is not suitable for ocean conditions as high as 5.

Journal ArticleDOI
TL;DR: In this article, an application of the finite element method (FEM) to analyze hydrodynamic properties of a floating breakwater in heaving and swaying motions is presented.

Journal ArticleDOI
TL;DR: In this paper, a simple mathematical model of human stored heat loss is used to rationalize this observation, and also it successfully predicts voluntary exposure times of unheated divers who become cold.

Journal ArticleDOI
TL;DR: In this paper, the response of a compliant platform to irregular waves is determined using finite element method, where the tower is idealized by 2D beam elements with an elastic support at the guy lines location, and the flexural characteristics of the beam correspond to the four corner members of the trusses.

Journal ArticleDOI
TL;DR: A technique has been developed to evaluate the dynamic pressures on cylindrical structures due to irregular waves based on McCamy and Fuchs linear diffraction theory and principle of superposition as discussed by the authors.

Journal ArticleDOI
TL;DR: In this paper, the authors obtained the governing equations of rolling motion of a ship with a flooded compartment through the variational formulation in the form of Hamilton-Ostrogradskii equation by taking the ship, fluid in the flooded compartment and the sea as a single mechanical system.

Journal ArticleDOI
TL;DR: In this article, a motion compensation system for conductivity, temperature, and depth profilers was proposed to reduce the effect of ship motion on profiler drop rates, thereby enhancing the measurement capabilities of vertical profilers.

Journal ArticleDOI
TL;DR: In this article, the authors deal with model test results of a container vessel having a low block coefficient and fitted with an asymmetric afterbody to improve the water flow to the propeller and thus the propulsion.

Journal ArticleDOI
TL;DR: In this paper, equations are provided to determine the hydrostatic data for single-screw ships, fixing the block coefficient C B and the principal dimensions L 0, B 0 and T 0, with values T = (0÷1.5)T 0.