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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Society of Naval Architects of Korea
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Journal DOI :
The Society of Naval Architects of Korea
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Volume & Issues
Volume 41, Issue 6 - Dec 2004
Volume 41, Issue 5 - Oct 2004
Volume 41, Issue 4 - Aug 2004
Volume 41, Issue 3 - Jun 2004
Volume 41, Issue 2 - Apr 2004
Volume 41, Issue 1 - Feb 2004
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Development of GUI Program for Analyzing Directional Spectrum Waves
Journal of the Society of Naval Architects of Korea, volume 41, issue 1, 2004, Pages 1~7
DOI : 10.3744/SNAK.2004.41.1.001
GUI program for analyzing directional spectrum waves is introduced in this paper Basically, MLM (Maximum Likelihood Method) was used for this program which was additionally consisted of performing spectral and time domain analysis for two dimensional irregular waves. Moreover, the directionality of directional spectrum waves generated by single summation and double summation method was investigated based on MLM. The directionality from each summation method has good agreement compared with that of target wave spreading function in the case of single wide directional spectrum waves. In addition to this, the resolution of directionality in double summation method was investigated as introducing coherence function between each wave component
A Study on the Deck Wetness of the FPSO
Journal of the Society of Naval Architects of Korea, volume 41, issue 1, 2004, Pages 8~14
DOI : 10.3744/SNAK.2004.41.1.008
As the number of offshore structure is glowing in deep waters, there have been increased damages of it. These floating structures in offshore locations exposed to harsh environmental conditions. In recent years, there has been a slowing attention around damages on bow and deck on FPSO caused by waves in steep storm condition. This paper describes a study of the water on deck due to the dynamic behavior of a FPSO with turret mooring system. The nonlinear motions of the FPSO are simulated under external forces due to wave, current, wind, and mooring forces in the time domain. The direct integration method is employed to estimate low frequency drift wave forces. The current forces are calculated by using slow motion maneuvering equations in the horizontal plane. The coefficients of a model for wind forces are calculated from Isherwood`s experimental data and the variation of wind speed is estimated by wind spectrum according to the guidelines of API-RP2A.
Grid Generation and flow Analysis around a Twin-skeg Container Ship
Journal of the Society of Naval Architects of Korea, volume 41, issue 1, 2004, Pages 15~22
DOI : 10.3744/SNAK.2004.41.1.015
Twin-skeg type stern shapes are recently adopted for very large commercial ships. However it is difficult to apply a CFD system to a hull form having twin-skeg, since grid topology around a twin-skeg type stern is more complicated than that of a conventional single-screw ship, or of an open-shaft type twin-screw ship with center-skeg. In the present study a surface mesh generator and a multi-block field grid generation program have been developed for twin-skeg type stern. Furthermore, multi-block flow solvers are utilized for potential and viscous flow analysis around a twin-skeg type stern The present computational system is applied to a 15,000TEU container ship with twin-skeg to prove the applicability. Wave profiles and wake distribution are calculated using the developed flow analysis tools and the results are compared with towing tank measurements.
Computation of Pressure Fields in the Lagrangian Vortex Method
Journal of the Society of Naval Architects of Korea, volume 41, issue 1, 2004, Pages 23~30
DOI : 10.3744/SNAK.2004.41.1.023
In the Lagrangian vortex particle method based on the vorticity-velocity formulation for solving the incompressible Navier-Stokes equations, a numerical scheme for calculating pressure fields is presented. Implementation of the numerical method is directly connected with the well-established surface panel methods, just by dealing with the dynamic coupling among vorticity field. Assuming the vorticity and the velocity fields are to be calculated in time domain analysis, the pressure calculation for a complete set of solution at present time step is performed in a similar way to the one used in the Eulerian description. For a validation of the present method, we illustrate the early development of the viscous flow about an impulsive started circular cylinder for Reynolds number 550. The comparative study with the Eulerian finite Volume method provides an extensive understanding and application of the mesh-free Lagrangian vortex methods for numerical simulation of viscous flows around arbitrary bodies of general shape.
Experimental Study of Hydroelastic Behaviors of VLFS Considering Breakwaters
Journal of the Society of Naval Architects of Korea, volume 41, issue 1, 2004, Pages 31~39
DOI : 10.3744/SNAK.2004.41.1.031
In this paper, an experimental study on the hydroelastic behaviors of a VLFS with L
Crabbing Test of a 3m Ferry Model
Journal of the Society of Naval Architects of Korea, volume 41, issue 1, 2004, Pages 40~46
DOI : 10.3744/SNAK.2004.41.1.040
In this paper, one of the harbour manoeuvring tests is described. its goal is to investigate the so-called crabbing performance of ships. By crabbing is meant the ability of the vessel to move sideways with the use of her own manoeuvring devices like propellers, rudders, transverse thruster, etc. The crabbing model tests were carried out in the Ocean Engineering Wide Tank, University of Ulsan(UOU) to measure the transverse forces and yawing moments by the transverse thruster alone and the propeller-rudder arrangement in combination with the bow thruster. The comparison between UOU crabbing test results and data measured at one of foreign research institutes showed a little gap due to different rotating conditions of controllable pitch propellers.
Development of Numerical Tool for the DNS/LES of Turbulent Flow for Frictional Drag Reduction
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Journal of the Society of Naval Architects of Korea, volume 41, issue 1, 2004, Pages 47~54
DOI : 10.3744/SNAK.2004.41.1.047
The friction drag reduction of a ship is of prime importance for the design and production of high-valued/high-tech ship. Thus, this study carried out the development of reliable numerical tools to identify the friction drag reduction mechanism for turbulent boundary layer on the ship surface and to deduce the optimum reduction technique by numerical experiment. The developed LES and DNS numerical tools were applied to simulate the turbulent channel flow These results were very well matched with previous results not only qualitatively but also quantitatively. The parallelization using MPI (Message Passing Interface) technique implemented in the developed code to speed up the simulation and to obtain the accurate results from the fine grid system was testified its computational efficiency.
Simulator for Weld-Induced Deformation Prediction of Panel blocks
Journal of the Society of Naval Architects of Korea, volume 41, issue 1, 2004, Pages 55~63
DOI : 10.3744/SNAK.2004.41.1.055
This paper is concerned with the simulator to estimate deformation due to welding of panel blocks. An efficient computer program system has been developed which can be applied to estimation of weld-induced deformation under the given welding conditions. The theoretical background of the present simulator is described with the prediction model for the various type of weld-induced deformation. The developed simulator has been applied to estimation of weld-induced deformation in panel block assembly. This paper ends with some findings from applying the developed simulator.
Development of Medium Size High Speed Ro-Pax Vessel
Journal of the Society of Naval Architects of Korea, volume 41, issue 1, 2004, Pages 64~69
DOI : 10.3744/SNAK.2004.41.1.064
In recent years, Medium size high speed Ro-Pax vessel has appeared at European sea and especially Agean sea is a center of operating in this type of Ro-Pax. This vessel operates its high Froude number range and requires higher engine power due to considerably increased resistance in comparing to large Ro-Pax in high speed range. SHI has investigated this kind of high speed Ro-Pax in accordance with market requirements and developed more advanced vessel to meet the future market needs. Process of hull form development, model test results and design of general arrangement results are introduced in this paper
An Experimental Study on Resistance decrease Due to the Stern Flap of a Large Warship
Journal of the Society of Naval Architects of Korea, volume 41, issue 1, 2004, Pages 70~74
DOI : 10.3744/SNAK.2004.41.1.070
Model tests for a stern flap have been performed to decrease the resistance of a large warship and to optimize the flap. Stern flaps and wedges of fast crafts are studied to apply to a large vessel in terms of speed-length ratio. The model tests of the flap has been carried out to find the effects of the design parameters, i.e. length and angie on resistance decrease. This work concludes that the optimized stern flap reduced resistance not only at the high speed by 9％ but also at the cruising speed.
A Study on Surface Modeling of Hull forms for General purpose CAD program
Journal of the Society of Naval Architects of Korea, volume 41, issue 1, 2004, Pages 75~81
DOI : 10.3744/SNAK.2004.41.1.075
In this study surface modeling .method with 3D curve net is proposed. For surface modeling, ship hull was divided into several parts, Generated surface was loaded general purpose CAD program through IGES file format, and the quality of generated surface model was checked by CATIA`s internal function. Lastly it is tried to find a method for improving the accuracy of surface connection by using the blending method in CATIA and the result was discussed.
A Manufacturing Technology Development of Microbe Carrier
Journal of the Society of Naval Architects of Korea, volume 41, issue 1, 2004, Pages 82~87
DOI : 10.3744/SNAK.2004.41.1.082
The purpose of this paper is to obtain the data for manufacturing of microbe carriers as a method of FRP waste recycling technology. Since FRP waste is polymer, the experiment of the thermogravity analyzing was carried out to find thermal behavior. After that, microbe carriers were prepared from waste FRP powder, which had been decomposed, milled, and mixed with clay as a binder and CaCO3 as a flux and a loaming agent, respectively. finally it was made by filing of the sample up to 1,05
. It was investigated how the variation of the additives and firing temperature effect apparent density, water absorption and micro structure.
Evaluation Anticorrosive Properties of Corrosion Protective Organic Coatings by Electrochemical Impedance Spectroscopy
Journal of the Society of Naval Architects of Korea, volume 41, issue 1, 2004, Pages 88~93
DOI : 10.3744/SNAK.2004.41.1.088
Electrochemical impedance spectroscopy was used to evaluate the anticorrosive properties of resin(alkyd, epoxy, urethane) and pigment(hydroxy apatite(HAp), zinc potassium chromate(ZPC). red lead(RL)). The corrosion behavior of coatings applied on steel has been investigated during exposure to 0.5M-NaCl The anticorrosive performances of resins were found to depend on their chemical nature and decreased in the order of urethane > epoxy > alkyd resin coating. Hydroxy apatite and zinc potassium chromate pigment which have property to passivate the substrate showed relatively high anticorrosive performance.