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ULTIMO AGGIORNAMENTO BANCA DATI: 13/09/2024 13:00:57

Simulation of Atmospheric and Oceanographic Parameters for Spray Icing Prediction

ABSTRACT The application of Bayesian inference in prediction of meteorological and oceanographic parameters to improve the estimation of sea spray icing in the Arctic region is purposed. Reanalysis data from NOrwegian ReAnalysis 10km (NORA10) during 33 years are applied to evaluate the performance ...

Design of Deepwater SCRs for the Application in South China Sea

ABSTRACT SCRs have been found to have the advantages of relatively low manufacturing cost and good adaptability of floating platform's motion. For deepwater SCRs in extreme harsh environment, a steel lazy-wave riser has been adopted for reducing vessel payload and to decouple vessel motion in touch ...

Numerical Comparison of Structural Crashworthiness of Ship Engine Room and Cargo Hold in Collisions

ABSTRACT The paper compares the crashworthiness of engine room and cargo hold to assess the safety performance in ship collisions. The external dynamics and the internal mechanics are combined to analyze the structural damages. The finite element simulations of ship collisions account for bow and side ...

Modeling and Optimization of Green Ships Using Diesel/Natural Gas/Fuel Cell Hybrid or Pure Electric Propulsions

ABSTRACT A new method for the integrated modeling of electrified marine propulsion systems has been introduced to predict and identify the best propulsion solution with higher energy efficiency, lower emissions and lifecycle cost. The benefits of advanced hybrid electric propulsion systems with diesel, ...

Exploring Mechanisms of Air-Injection Drag Reduction Through Numerical-Experimental Data Correlation

ABSTRACT A ship moving in water experiences resistances, the major component of which is frictional resistance arising from water viscosity. Therefore, drag-reduction has been an active research field in marine transportation over the last decades. A variety of innovative drag reduction techniques ...

Numerical Simulation of Cavitation Flows Around NACA66 Hydrofoil by Adaptive Mesh Refinement

The main attention of present work is to investigate the ability of a adaptive mesh ganeration method in accurate cavitation simulation. A numerical study of the cavitation around NACA66 hydrofoil has been carried out. The simulation results such as cavitation shape, the lift coefficient CL and the ...

Numerical Simulation of Intrusion Behavior of Oceanic Water into the Seto Inland Sea, Japan

ABSTRACT The Seto Inland Sea of Japan has had serious water quality problems as a result of red tide and hypoxia caused by increased phytoplankton growth and, which has led to significant marine life mortality. In recent years, the quality of this sea has significantly improved under the government's ...

The Method of Design Ice Loads Standardization in Application to Vertical Side Structures in the Bow and Stern Areas of Ice Going Vessels

ABSTRACT Until 2019 the Rules of Russian Maritime Register of Shipping (RS) had only regulated design ice impact loads on inclined hull sides. These regulations are based on a hydrodynamic model of ship hull/ice interaction. At present large-size vessels operating in the Arctic seas have full hull ...

Experimental Study on Pitching Reduction of Ship Model with Controllable Interceptor in Wave

ABSTRACT The pressure distribution of ship hull can be influenced by a interceptor, which is installed at the stern of ship, to induce a moment for reduing the pitch motion of the ship. However, the phase and amplitude of the moment provided by the interceptor is difficult to determine. This paper ...

Comparative Study of Hull Form Optimization with or Without Design-Space Dimensionality Reduction

ABSTRACT For a hull form optimization design with a relatively large number of design variables, numerous new sample hulls need to be evaluated which cause plenty of computation resource. Therefore, in order to avoid highdimensional sampling, a design-space dimensionality reduction method based on ...

Whisker Mechanism of Marine Electronic Components

ABSTRACT The tendency of electronic devices, sensors, and integrated circuits aim at applications of ultrahigh frequency, miniaturization, multi-functionality and super integration. One critical issue in the modern microfabrication industry is caused by the uncontrollable Tin-whisker growth on wire ...

Hydrodynamic Analysis of Ultra-High Pressure Water Derusting Nozzle

ABSTRACT Rust removal is a necessary step of surface coating treatment in shipbuilding and ship repairing industry. As one of the efficient and environment protecting application methods, the derusting technique using ultra-high pressure water jet is favorable in many developed shipyards. The straight ...

Response Analysis of Seine Boat Due to Sloshing of Fuel-Freshwater

ABSTRACT The research about the sloshing inside liquid tanks and the consequent boat's motions always attract much attention. Based on the three-dimensional potential flow theory and by means of analyzing the seine boat's motion under various working conditions, the hydrodynamic coefficients are obtained ...

Calculation of Ice Breaking Resistance of Level Ice Based on CFD-DEM Coupling Method

ABSTRACT Ice load is an important factor in ship structure design and safe navigation. In view of the advantages of Discrete Element Method (DEM) in dealing with the problem of discontinuous medium, the ice resistance of ships in flat ice area is analyzed by using DEM, and the resistance of water body ...

Long-term Structural Vibration Monitoring of a Metrology Mast in Taiwan – An Investigation of Marine Structures

ABSTRACT The rapid development of the offshore wind industry has generated increased interest in marine environments. To obtain environmental data pertinent to the operation of an offshore wind farm, a metrology mast was installed by the Taiwan Power Company (TPC). This study focusses on structural ...

Experimental Studies on the Performance of A Box-Type Free-Surface Breakwater with Symmetrical Wavy Bottom

ABSTRACT This paper studies, through physical model experiments, the attenuation performance of a new type of box-type free-surface breakwater with symmetrical wavy bottom. A series of experiments were carried out with changing the box immersion depth and the wave steepness. The transmission coefficient, ...

A Numerical Study of Wave Drift Force on an Oblique Moving Ship in Regular Waves

ABSTRACT A time domain higher-order Rankine panel method is developed and applied for predicting the wave-induced motions of a ship navigating with a small drift angle in waves. As for the numerical procedure of solutions, the double-body flow accounting for the trailing vortices effect is first evaluated ...

Moonpool Induced Added Resistance and Motion of a Drillship in Waves During Transit

ABSTRACT Moonpool added resistance is a practical problem in drillship design. In the past, studies are more focused on calm water resistance but few attempts on wave added resistance. In this study, CFD simulations are performed for a drillship with a large moonpool opening to evaluate its resistance ...

CFD Investigations of Ship Propulsion Performance at Different Trim Angles

ABSTRACT In the present work, ship propulsion performance at different trim angles are investigated. CFD method with dynamic overset grid technique is used to direct simulate the free running ship model. The self-propulsion with design ship speed Fr=0.20 is firstly conducted and the predicted results ...

A BHA with Integrated Casing Cutting and Fishing Tools Applied in Offshore of Well Abandonment

ABSTRACT This paper introduces a BHA with integrated casing cutting and fishing tools applied in offshore operations of well abandonment. This kind of tool systems successfully applied in an offshore project of permanent abandoned wells. The advantage of the system is the combination of both cutting ...

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