ULTIMO AGGIORNAMENTO BANCA DATI: 13/09/2024 13:00:57
ABSTRACT Numerical Computation is a crucial tool to design ship performance including energy saving devices (ESDs). A procedure to design ESDs through the computational methods is proposed in this paper. The procedure consists of two steps. In the first step, the simple computational method based on ...
ABSTRACT: Large Eddy Simulation (LES) and infinite element method are carried out to simulate the non-cavitation noise of propeller behind the ship hull. The difference of total sound pressure level between experimental results and calculated results calculation results is 3.26dB, which shows that ...
ABSTRACT The flooding process of a damaged ship is a vital problem which is related to the survivability of the ship and the safeties of human life and property. It is always a complicated process accompanied with sloshing, wave breaking, air-liquid mixing and other nonlinear problems, thus it is difficult ...
ABSTRACT A 3-D model for hydrodynamic performance and Stokes waves propagation on the free surface is established using the Navier-Stokes equations and Stokes wave theory. The realizable k – ε turbulence model has been implemented to capture turbulent flow around the ship hull. The tracking of the ...
ABSTRACT Based on the RANS method, numerical simulation of self-propulsion model test is performed for the KVLCC2 model combined with Proportional-integral-derivative (PID) control theory. The initial propeller revolutions are estimated according to the numerically predicted ship resistance and propeller ...
ABSTRACT This paper discusses a multi-objective optimization problem of ship hull form by in-house solver, OPTShip-SJTU, to enhance the resistance and seakeeping performances under the given wave condition. The Free-Form Deformation (FFD) method is applied to modify the forepart of the initial hull ...
ABSTRACT The ship hull plate inevitably adopts non-developable surface fabricated by integrating mechanical bending with subsequent thermal forming. This paper primarily proposes a geometric flattening process to determine initial planar configuration based on area equivalent principle and investigates ...
ABSTRACT To hindcast the wave climate at a particular study area in North-western Coast of Sri Lanka, Wave Transformation Matrix and MIKE 21 Spectral Waves (SW) models were used. Directional wave data recorded at 15m ~ 16m depths in Colombo Port during 1998 – 2015 periods was transformed to the study ...
ABSTRACT Fatigue strength assessment on marine structures is usually implemented through simplified approach or spectral analysis, both of which are soundly guided by classification societies. However, the former method tends to overestimate the fatigue damage due to the assumed severer environment ...
ABSTRACT In this paper, we describe how to use multi-variable decision analysis to facilitate offshore oil and gas platform decommissioning. We implemented decision analysis as a software tool (PLATFORM) to clarify and evaluate decommissioning alternatives against a comprehensive set of objectives, ...
ABSTRACT Wave elevation around a cage array used in aquacultural engineering with different levels of biofouling are numerically investigated. The porous-media fluid model is introduced to model both the clean and the biofouled netting. An oscillating-boundary method is used to generate waves at one ...
ABSTRACT A short abstract (50 to 100 words) in a single paragraph should be included here. JAMSTEC is now dealing with some significant problems related to the ocean. In order to figure out the problems, various kinds of underwater vehicles have been developed and applied in response to actual demands. ...
ABSTRACT Fish cages in the open sea are exposed to cycle wave loads during their service life, and thus the fatigue reliability of mooring chains should be re-assessed to ensure the safety status. A numerical model was adopted to calculate the tension force of mooring chains. A nonlinear contact finite ...
ABSTRACT Offshore Floating Structures (OFSs) present a major category of offshore structures that are often subjected to severe environmental conditions and harsh critical loading scenarios. The state of an OFS during its life-cycle must remain in the domain specified in the design, although this can ...
Different kinds of deep eutectic solvents (DES) based on choline chloride (ChCl) and ionic liquids (ILs) based on 1-methylimidazole were used to modify Fe3O4/molecularly imprinted polymers (Fe3O4/MIPs), and the resulting materials were applied for the rapid purification of alkaloid isomers (theobromine ...
N-3 polyunsaturated fatty acids (PUFAs) improve endothelial function. The arachidonic acid-derived metabolites (epoxyeicosatrienoic acids (EETs)) are part of the endothelial hyperpolarization factor and are vasodilators independent of nitric oxide. However, little is known regarding the regulation of ...
Normative ethical considerations of growth of the marine biotechnology and aquaculture disciplines in biopharming, food production, and marine products commercialization from a bioethical perspective have been limited. This paucity of information begs the question of what constitutes a bioethical approach ...
Marine reptiles are declining globally, and recent climate change may be a contributing factor. The study of sea snakes collected beyond their typical distribution range provides valuable insight on how climate change affects marine reptile populations. Recently, we collected 12 Laticauda semifasciata ...
Data is provided to show the detailed fatty acid and lipidomic composition of normal and tumor rat colon tissues. Rats were fed either a Western fat diet or a fish oil diet, and half the rats from each diet group were treated with chemical carcinogens that induce colon cancer (azoxymethane and dextran ...
Background Insulin receptor substrate (Irs) proteins are essential for insulin signaling as they allow downstream effectors to dock with, and be activated by, the insulin receptor. A family of four Irs proteins have been identified in mice, however the gene for one of these, IRS3, has been pseudogenized ...