Showing papers in "Ocean Engineering in 2006"

TL;DR: In this article, a numerical algorithm based on the volume of fluid (VOF) technique is used to study the non-linear behavior and damping characteristics of liquid sloshing in a moving partially filled rectangular tank.

TL;DR: Application of hydroelastic theories to analysis of very large floating structures (VLFS) and papers from China and Japan (in native languages) are reviewed and discussed in details.

TL;DR: An artificial neural network, namely recurrent neural network with rprop update algorithm and is applied for wave forecasting and shows that the wave forecasting using recurrent neuralnetwork yields better results than the previous neural network application.

TL;DR: In this paper, a third-order mathematical model is introduced, aimed at describing strong parametric excitation associated with cyclic changes of the ship restoring characteristics, and a derivative model is employed to describe the coupled restoring actions up to third order.

TL;DR: In this paper, the authors presented an application of the neural network for forecasting the storm surge using the original data of Jiangjyun station in Taiwan to test the performance of the present model.

TL;DR: In this article, a conceptual design of an underwater star wars' system is presented, which will be more difficult to detect by the enemy than a recently proposed surface star wars system, and it is proposed that these underwater structures should operate up to a depth of 7.16 miles (11.52 kilometers).

TL;DR: In this article, Souto et al. used a 3D Smooth Particle Hydrodynamics (SPH) formulation to obtain accurate values for the moment amplitudes.

TL;DR: In this paper, the authors proposed a compact zero-mass pulsatile jet actuators for low-speed maneuvering and station keeping of small underwater vehicles, which could be used in two ways: (i) to improve the low speed maneuvering capability of traditional propeller driven underwater vehicles and (ii) as a synthetic jet for flow control and drag reduction at higher cruising speeds.

TL;DR: Field experiments demonstrate that ATSIS can robustly measure hundreds of matched image points in seconds, allowing fast extraction of the temporal evolution of a three-dimensional surface wave field.

TL;DR: In this article, the effects of transient dynamic, geometrical nonlinear, elastoplastic material behavior and fluid-structure interaction on a patrol boat subjected to an underwater explosion were investigated.

TL;DR: In this paper, the authors studied the vibration control of a jacket-type offshore platform with an active mass damper and presented a feed forward and feedback optimal control (FFOC) law.

TL;DR: In this article, a typical tension-leg type of floating platform incorporated with the tuned liquid column damper (TLCD) device is studied to find an effective and economic means to reduce the wave induced vibrations of the floating offshore platform system.

TL;DR: In this paper, the authors describe the numerical features of a computer program for analyzing the statics and dynamics of oceanographic cable structures, including the effects of geometric and material nonlinearities, bending stiffness for seamless modeling of slack cables, and a model for the interaction of cable segments with the sea floor.

TL;DR: Computational Fluid Dynamic (CFD) based on Reynolds Averaged Navier-Stokes equation is used for determining the transverse hydrodynamic damping force and moment coefficients that are needed in the maneuverability study of marine vehicles.

TL;DR: In this paper, a numerical model is developed, based on the lumped mass method, to simplify the net shape and tension distribution, and the results by the numerical simulation agree well with the experimental data.

TL;DR: In this paper, an accurate and practical thrust modeling for underwater vehicles which considers the effects of ambient flow velocity and angle is proposed, and the proposed model is evaluated by comparing experimental data with numerical model simulation data, and it accurately covers overall flow conditions within ±2 N force error.

TL;DR: In this paper, the authors simulated a number of periods using different resolutions of the ECMWF meteorological model and explored how the quality of the surface wind and wave model results varies with the resolution.

TL;DR: In this article, the statistics of nonlinear wave crests and wave-crest groups in deep and transitional water depths are considered, using an appropriate second-order representation for crest heights and the continuous wave-envelope approach.

TL;DR: The C-Plane is a submerged variable depth ocean current turbine that is tethered to the sea floor and uses sustained ocean currents to produce electricity as mentioned in this paper, and it is capable of changing depth in all expected operating conditions.

TL;DR: In this article, a method is proposed to design a new global controller that forces an underactuated ship to follow a reference path under disturbances induced by wave, wind and ocean currents.

TL;DR: The theoretical basis for the use of finite impulse response prediction filters is examined and it is demonstrated that despite the prediction filters having a non-causal impulse response such filters can be used in practice due to a combination of the asymmetric nature of the impulse response and the fundamentalnature of the prediction process.

TL;DR: In this paper, Suh and Park developed a numerical model that computes the reflection of regular waves from a fully perforated-wall caisson breakwater, and applied this model to a partially-perforated wall caisson and irregular waves and found that the model slightly over- and under-predicts the reflection coefficients at larger and smaller values.

TL;DR: In this article, a heaving axisymmetric floating body is tested with sinusoidal incident waves in a wave channel and compared with a linear mathematical model, for heave response, hydrodynamic parameters, absorbed wave power and converted hydraulic power.

TL;DR: In this article, a general absolute coordinate formulation is presented for the analysis of flexible pipe structure, which avoids the need of using infinitiminal or finite rotations as nodal variables at the local floating frames of reference by expressing the structural response characteristics in terms of globally based position coordinate and its derivative.

TL;DR: In this article, the performance of the contra-rotating Wells turbine installed in the LIMPET wave power station is compared to the predicted performance from theoretical analysis and model tests, and a reasonable agreement was found between the predicted and measured turbine damping characteristic, however the turbine efficiency was found to be poorly predicted.

TL;DR: In this paper, a simple estimation method of the force based on only the first mode internal wave is put forward without some complicated steps and observational current data in the old method, which can be estimated by the local vertical observational temperature, salinity data and amplitude of internal soliton.

TL;DR: In this paper, the wave transmission and reflection characteristics and wave induced pressures on single surface plate and twin plate barriers were investigated experimentally for a wide range of wave heights and periods in regular and random waves.

TL;DR: In this article, the authors developed a volume of fluid (VOF)-based two-phase flow model and discussed the applicability of the model to the simulation of wave-structure interactions.

TL;DR: Based on the idea of disturbing the water motion in the upright direction, a new kind of multiple-layer breakwater, which mainly consists of several horizontal plates, was proposed in this paper.

TL;DR: In this article, the authors present an assessment of an operational wave model (Wavewatch III) focusing upon the model sensitivity to wind-forcing products, including the NCEP/NCAR reanalysis and three other products that assimilate various satellite wind measurements having high spatial resolution.