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

Research on Robust Optimization for Ship Hull Form Design

Abstract Due to the uncertainty of external environmental condition in the process of designing the ship, the ship's performance may change and shift, or even fail during the ship operation. In order to reduce the influence of external uncertain factors on ship's performance, the robustness of the ...

Numerical and Field Study of Ship-generated Waves in Xicheng Canal, China

Abstract With the enhanced ship hydrodynamic in Xicheng Canal, the shipgenerated waves are the main factor inducing turbidity in the water column and damages of the channel revetments. In this study, to clarify the characteristics of ship-generated waves in Xicheng Canal, field observations and numerical ...

Challenges for EER Solutions in European Arctic Waters

Abstract This paper discusses the status and development prospects of Arctic escape, evacuation and rescue (EER) solutions in the Greenland and Barents Seas, and briefly describes two recent maritime rescue operations in Norwegian waters. Successful outcomes of maritime EER operations in Arctic waters ...

The Effects of Air Cushion on the Buffering Performance of a Marine Fender Made of Hard Rubber

Abstract Fenders are used for the protection of ship hull from impact forces caused at the berthing to a quay, by their buffering effects. The aim of this study is to introduce air cushioning effects to the fender design by using numerical simulation method. We estimate the buffering performances of ...

Multifunctional Composite Coatings on Metals and Alloys for Marine Applications

Abstract The multifunctional composite coatings having practically important properties (anticorrosive, antifriction, hydrophobic, superhydrophobic etc.) were obtained on the aluminum and magnesium alloys using plasma electrolytic oxidation (PEO) and fluoropolymer materials (superdispersed polytetrafluoroethylene ...

Oscillatory Flow around a Sphere Resting on a Rough Bottom: Direct Numerical Simulations

Abstract Oscillatory flow around a large sphere resting on a plane and rough bottom is simulated by means of direct numerical simulations of continuity and Navier-Stokes equations. The bottom roughness is provided by a layer of spherical particles, the size of which is much smaller than the radius ...

An Inverse Design of the Fore Part of KCS Container Ship

Abstract The paper discusses the application of the homotopy algorithm, coupled with a hull form modification method based on RBF(Radial basis function)interpolation, in order to deal with the inverse design of the fore part of the ship hull of a modern container ship KCS. The RBF interpolation has ...

Simulation of Water Entry of a Free-falling Wedge by Improved MPS Method

Abstract In the present study, the process of free-falling wedge impacting on water is numerically studied by our in house solver based on Moving Particle Semi-Implicit (MPS) method. Some improved schemes are used in this solver to suppress numerically unphysical pressure oscillation in traditional ...

Comparative studies of 3-D LNG tank sloshing based on the VOF and IMPS methods

Abstract The present work is focused on the comparative study of two numerical methods, i.e. MPS method and VOF method, for the prediction of sloshing in LNG tank. Numerical simulations are carried out by an in house meshless solver MLParticle-SJTU based on improved Moving Particle Semi-Implicit (IMPS) ...

Numerical Simulation of Ship-Ship Interactions in Shallow Water

Abstract The objective of this study is to predict and analyze the viscous flow and the ship-ship interaction between two different tankers KVLCC2 and Aframax advancing in shallow water with same speed and with a fixed separation distance by solving the unsteady RANS equations in combination with the ...

Multi-Objective Hydrodynamic Optimization of Ship Hull Based on Approximation Model

Abstract A practical multi-objective optimization tool, named OPTShip-SJTU, is utilized here to optimize both of the resistance and seakeeping performance for a surface combatant DTMB Model 5415. During the optimization procedure, free-form deformation (FFD) method is used as parametric hull surface ...

Remedies for Coastal Defense due to Coastal Development

Abstract Coastal erosion caused by structures due to exploitation is a serious problem for coastal management in Taiwan. These structures disturb the continuity of the original littoral sediment transports, resulting in retreats of the shorelines in the downstream areas. This paper tries to assess ...

Guidance Notes on Whipping Assessment of Large Container Ships

Abstract One of the critical issues for large container ships is the vibration of the hull girder due to wave impact which leads to excitation of whipping responses. This study presents analysis guidance to determine values of dynamic bending moments considering the effects due to whipping which are ...

Nonlinear Hydroelasticity of Large Container Ship

Abstract The paper proposes a numerical method for analyzing nonlinear wave loads using a hydroelastic model. The numerical analysis method utilizes a 3-D Green function method and a 2-D momentum model, which are coupled in the time domain. The computational results were compared with those of a model ...

Simulation of Longshore Sediment Transport and Coastline Change in the Vicinity of Two Fishery Tidal Inlets of Messolonghi – Aetoliko Lagoon Complex

Abstract To quantify the detailed mechanisms that cause sedimentation at the tidal inlets and deformation of shore line in the Messolonghi-Aetoliko lagoonal system, the Litpack numerical simulation model was applied. The study focuses on the longshore sediment transport as well as the coastline evolution, ...

Ship Multidisciplinary Robust Design Optimization under Multidimensional Stochastic Uncertainties

Abstract Generally the multidisciplinary design optimization in ship design only considers the impact of certainties with ignoring the existence of uncertainties in the design. The results of the optimization obviously cannot really guarantee the feasibility of ship hull and excellence of sailing performance. ...

High Frequency Heating of Subsea Oil Production Pipelines

Abstract Direct Electrical Heating (DEH) of offshore pipelines is an established cost-efficient and environmental friendly method for flow assurance in offshore oil production compared to traditional methods such as chemical injection. The first DEH system was installed in year 2000 in the North Sea, ...

Effects of Tank Motion on Oil Spilling from Damaged Oil Tanks

Abstract The grounded or collided oil tankers are often subjected to periodic motions, which excites the liquid sloshing inside the cargo tanks and influences the oil spilling. This paper presents a systematic numerical investigation of the effects of the tank motions on the oil spilling from damaged ...

Development of Sea Spray Meters and an Analysis of Sea Spray Characteristics in Large Vessels

Abstract In order to address icing on ships, we develop sea spray meters, the sea spray particle counter (SPC) and the marine rain gauge type spray gauge (MRS), for measuring the spray particles and the amount of spray. The laboratory tests indicate that the amount of spray obtained by the MRS is close ...

On the Principles and Strategies in Building of Ecological Green Harbors

Abstract With the rapid development of harbor construction in China and in other developing countries, environmental protection and ecological harmony have become decisive factors in harbor planning, design and construction management. Green harbor concept and ecological strategies are important means ...

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di: 1694

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