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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
Journal Basic Information
Journal DOI :
The Society of Naval Architects of Korea
Editor in Chief :
Volume & Issues
Volume 34, Issue 4 - Nov 1997
Volume 34, Issue 3 - Aug 1997
Volume 34, Issue 2 - May 1997
Volume 34, Issue 1 - Feb 1997
Selecting the target year
Performance Test of Pod-type Waterjet Propulsion System
Kim, K.S. ; Song, I.H. ; Ahn, J.W. ; Moon, I.S. ;
Journal of the Society of Naval Architects of Korea, volume 34, issue 4, 1997, Pages 21~30
This paper describes the experimental method of a pod-type waterjet propulsion system in a towing tank and shows the experimental analysis and test results of a designed waterjet propulsion system to be used for a hybrid high speed craft. The cruising performance of this craft is estimated from the results of the hull resistance test and waterjet test under the assumption that the interaction between the hull and the inlet pod is very small. A pod-type waterjet system with an axial pump was designed and a stand-alone waterjet experimental system was developed. Useful data such as the pump performance, the jet efficiency, the losses of inlet duct and nozzle were obtained. Test results show a good agreement with the design requirement.
Prediction of Performance of Waterjet Propulsors by Surface Panel Method
Moon, II-Sung ; Lee, Chang-Sup ; Song, In-Haeng ; Kim, Ki-Sup ;
Journal of the Society of Naval Architects of Korea, volume 34, issue 4, 1997, Pages 31~41
This paper describes a potential-based panel method formulated for the prediction of the steady performance of a waterjet propulsor. The method employs normal dipoles and sources distributed on the solid surfaces such as the impeller/stator blades, hub and duct, and normal dipoles in the shed wakes trailing the impeller and stator to represent the potential flow around the waterjet propulsor. To define a closed boundary surface, the inlet and outlet open boundary surfaces are introduced where the sources and dipoles are distributed. The kinematic boundary condition on the solid boundary surface is satisfied by requiring that the normal component of the total velocity should vanish. On the inlet surface, the total inflow flux into the duct is specified, and on the outlet surface the conservation of mass principle is applied to evaluate the source strength. The solid surfaces are discretized into a set of quadrilateral panel elements and the strengths of sources and dipoles are assumed constant at each panel. Applying this approximation to the boundary conditions leads to a set of simultaneous equations. Systematic numerical tests show that the present numerical method is fast and stable. In order to validate the present method, sample computations are carried out first for the case of a conventional axial flow fan which has a similar geometry as the waterjet propulsor, and then for the case of a waterjet propulsor on which experiments are carried out at KRISO(Korea Research Institute of Ships and Ocean Engineering).
A Study on the Boundary Element Method for Numerical Analysis of Nonlinear Free Surface Waves(I)
Sung, Hong G. ; Hong, Sa Y. ; Choi, Hang S. ;
Journal of the Society of Naval Architects of Korea, volume 34, issue 4, 1997, Pages 53~60
Nonlinear free surface flow phenomena have teen studied by several kinds of numerical methods, of which boundary element method has been known as most promising one. There, however, remain many difficulties to be solved in the numerical procedures by boundary element analysis. In this paper, an efficient calculation of elemental integrals and iterative solution algorithm for the resulting system of equations were thoroughly investigated in order to enhance the procedure of the boundary element analysis. Advantages of the herein developed boundary element analysis code are demonstrated in terms of accuracy and convergence for typical boundary-value problems with free surface.
Structural Analysis of Thin-walled Beams by Using a Mixed Finite Element Method
Park, Seong-Whan ;
Journal of the Society of Naval Architects of Korea, volume 34, issue 4, 1997, Pages 99~107
A mixed type finite element method is applied to the nonuniform shear warping beam theory which is very useful for the structural analysis of thin-walled sectional beams considering the shear deformation. As known generally, it is shown that the mixed type finite element method, compared with the displacement type one, can give more balanced accuracy of results in calculating the stresses and displacements of the structure. In this paper, one typical example, the flexural-torsional problem of a discontinuously variable sectional beam under coupled end torsional moments, is selected and analyzed to validate the usefulness of the developed beam element.
Vertical Convection Flow around V-Shaped Structures in Uniform Current
Yang, Chan-Kyu ; Hong, Keyyong ;
Journal of the Society of Naval Architects of Korea, volume 34, issue 4, 1997, Pages 148~157
In this paper, the flow around a V-shaped plate positioned against horizontal flow is numerically simulated by using finite volume method and experimentally visualized in two dimensional tank by dye injection method. The upwelling flow artificially induced by V-shaped plate mixes the stratified stagnant flow. It can be applied to mitigate the eutrophication and stratification of sea in the vicinity of offshore structures.