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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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International Journal of Naval Architecture and Ocean Engineering
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Journal DOI :
The Society of Naval Architects of Korea
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Volume & Issues
Volume 3, Issue 4 - Dec 2011
Volume 3, Issue 3 - Sep 2011
Volume 3, Issue 2 - Jun 2011
Volume 3, Issue 1 - Mar 2011
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Panel cutting method: new approach to generate panels on a hull in Rankine source potential approximation
Choi, Hee-Jong ; Chun, Ho-Hwan ; Park, Il-Ryong ; Kim, Jin ;
International Journal of Naval Architecture and Ocean Engineering, volume 3, issue 4, 2011, Pages 225~232
DOI : 10.3744/JNAOE.2011.3.4.225
In the present study, a new hull panel generation algorithm, namely panel cutting method, was developed to predict flow phenomena around a ship using the Rankine source potential based panel method, where the iterative method was used to satisfy the nonlinear free surface condition and the trim and sinkage of the ship was taken into account. Numerical computations were performed to investigate the validity of the proposed hull panel generation algorithm for Series 60 (
=0.60) hull and KRISO container ship (KCS), a container ship designed by Maritime and Ocean Engineering Research Institute (MOERI). The computational results were validated by comparing with the existing experimental data.
Managing maritime automobile terminals: an approach toward decision-support model for higher productivity
Beskovnik, Bojan ; Twrdy, Elen ;
International Journal of Naval Architecture and Ocean Engineering, volume 3, issue 4, 2011, Pages 233~241
DOI : 10.3744/JNAOE.2011.3.4.233
The article describes actions and strategies to obtain higher productivity on maritime automobile terminals. The main focus is on elaboration of efficient and effective organizational structure to model and implement short-term, mid-term and long-term strategies. In addition, with an empiric approach we combined the analyses of current findings in important scientific papers and our acknowledgments in practical research of north Adriatic maritime automobile terminals. The main goal is to propose actions towards increasing system's productivity. Based on our research of the north Adriatic maritime automobile terminals and with Lambert's model an in-deep analysis of limiting factors, user's expectations and possibilities for productivity increase has been performed. Moreover, with our acknowledgments a three-level decision-support model is presented. With an adequate model implementation it is possible to efficiently develop and implement different strategies of productivity measurement and productivity increase, especially in the fields of internal transport productivity, entrance/exit truck gates operations and wagon manipulations. According to our observation a significant increase might be achieved in all three fields.
Verification of drag-reduction capabilities of stiff compliant coatings in air flow at moderate speeds
Boiko, Andrey V. ; Kulik, Victor M. ; Chun, Ho-Hwan ; Lee, In-Won ;
International Journal of Naval Architecture and Ocean Engineering, volume 3, issue 4, 2011, Pages 242~253
DOI : 10.3744/JNAOE.2011.3.4.242
Skin frictional drag reduction efficiency of "stiff" compliant coating was investigated in a wind tunnel experiment. Flat plate compliant coating inserts were installed in a wind tunnel and the measurements of skin frictional drag and velocity field were carried out. The compliant coatings with varying viscoelastic properties had been prepared using different composition. In order to optimize the coating thickness, the most important design parameter, the dynamic viscoelastic properties had been determined experimentally. The aging of the materials (variation of their properties) during half a year was documented as well. A design procedure proposed by Kulik et al. (2008) was applied to get an optimal value for the coating thickness. Along with the drag measurement using the strain balance, velocity and pressure were measured for different coatings. The compliant coatings with the thickness h = 7mm achieved 4~5% drag reduction within a velocity range 30~40 m/s. The drag reduction mechanism of the attenuation of turbulence velocity fluctuations due to the compliant coating was demonstrated. It is envisioned that larger drag reduction effect is obtainable at higher flow velocities for high speed trains and subsonic aircrafts.
Optimization of compartments arrangement of submarine pressure hull with knowledge based system
Chung, Bo-Young ; Kim, Soo-Young ; Shin, Sung-Chul ; Koo, Youn-Hoe ; Kraus, Andreas ;
International Journal of Naval Architecture and Ocean Engineering, volume 3, issue 4, 2011, Pages 254~262
DOI : 10.3744/JNAOE.2011.3.4.254
This study aims to optimize an arrangement of ship compartments with knowledge-based systems. Though great attention has been shown to the optimization of hull forms in recent years, the study on arrangement design optimization has received relatively little attention. A ship is both an engineering system and a kind of assembly of many spaces. This means that, to design an arrangement of ship compartments, it is necessary to treat not only geometric data but also knowledge on topological relations between spaces and components of a ship. In this regard, we select a suitable knowledge representation scheme for describing ship compartments and their relations, and then develop a knowledge-based system using expert system shell. This new approach is applied to create design variations for optimization on an arrangement of a pressure hull of a submerged vehicle. Finally, we explicate how our approach improves the design process.
Modelling cavitating flow around underwater missiles
Petitpas, Fabien ; Saurel, Richard ; Ahn, Byoung-Kwon ; Ko, Sung-Ho ;
International Journal of Naval Architecture and Ocean Engineering, volume 3, issue 4, 2011, Pages 263~273
DOI : 10.3744/JNAOE.2011.3.4.263
The diffuse interface model of Saurel et al. (2008) is used for the computation of compressible cavitating flows around underwater missiles. Such systems use gas injection and natural cavitation to reduce drag effects. Consequently material interfaces appear separating liquid and gas. These interfaces may have a really complex dynamics such that only a few formulations are able to predict their evolution. Contrarily to front tracking or interface reconstruction method the interfaces are computed as diffused numerical zones, that are captured in a routinely manner, as is done usually with gas dynamics solvers for shocks and contact discontinuity. With the present approach, a single set of partial differential equations is solved everywhere, with a single numerical scheme. This leads to very efficient solvers. The algorithm derived in Saurel et al. (2009) is used to compute cavitation pockets around solid bodies. It is first validated against experiments done in cavitation tunnel at CNU. Then it is used to compute flows around high speed underwater systems (Shkval-like missile). Performance data are then computed showing method ability to predict forces acting on the system.
Buckling analysis and optimal structural design of supercavitating vehicles using finite element technology
Byun, Wan-Il ; Kim, Min-Ki ; Park, Kook-Jin ; Kim, Seung-Jo ; Chung, Min-Ho ; Cho, Jin-Yeon ; Park, Sung-Han ;
International Journal of Naval Architecture and Ocean Engineering, volume 3, issue 4, 2011, Pages 274~285
DOI : 10.3744/JNAOE.2011.3.4.274
The supercavitating vehicle is an underwater vehicle that is surrounded almost completely by a supercavity to reduce hydrodynamic drag substantially. Since the cruise speed of the vehicle is much higher than that of conventional submarines, the drag force is huge and a buckling may occur. The buckling phenomenon is analyzed in this study through static and dynamic approaches. Critical buckling load and pressure as well as buckling mode shapes are calculated using static buckling analysis and a stability map is obtained from dynamic buckling analysis. When the finite element method (FEM) is used for the buckling analysis, the solver requires a linear static solver and an eigenvalue solver. In this study, these two solvers are integrated and a consolidated buckling analysis module is constructed. Furthermore, Particle Swarm Optimization (PSO) algorithm is combined in the buckling analysis module to perform a design optimization computation of a simplified supercavitating vehicle. The simplified configuration includes cylindrical shell structure with three stiffeners. The target for the design optimization process is to minimize total weight while maintaining the given structure buckling-free.
Study on self-pulsation characteristics of gas centered shear coaxial injector for supercavitating underwater propulsion system
Yoon, Jung-Soo ; Chung, Jae-Mook ; Yoon, Young-Bin ;
International Journal of Naval Architecture and Ocean Engineering, volume 3, issue 4, 2011, Pages 286~292
DOI : 10.3744/JNAOE.2011.3.4.286
In order to design a shear coaxial injector of solid particles for underwater propulsion system, basic experiments on gas-liquid shear coaxial injector are necessary. In the gas-liquid coaxial injector self-pulsation usually occurs with an intense scream. When self-pulsation occurs, mass flow rate oscillation and intense scream are detected by the interactions between the liquid and gas phase. Self-pulsation must be suppressed since this oscillation may cause combustion instabilities. Considerable research has been conducted on self-pulsation characteristics, but these researches are conducted in swirl coaxial injector. The main objective of this research is to understand the characteristics of self-pulsation in shear coaxial injector and reveal the mechanism of the phenomenon. Toward this object, self-pulsation frequency and spray patterns are measured by laser diagnostics and indirect photography. The self-pulsation characteristics of shear coaxial injector are studied with various injection conditions, such as the pressure drop of liquid and gas phase, and recess ratio. It was found that the frequency of the self-pulsation is proportional to the liquid and gas Reynolds number, and proportional to the L/d.