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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of computational fluids engineering
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Journal DOI :
Korea Society of Computational Fluids Engineering
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Volume & Issues
Volume 6, Issue 4 - Dec 2001
Volume 6, Issue 3 - Sep 2001
Volume 6, Issue 2 - Jun 2001
Volume 6, Issue 1 - Mar 2001
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Analysis of Natural Convection Heat Transfer and Solidification of a Two-Layered Pool
Kim J. ; Kang K. S. ; Kim S. B. ; Kim H. D. ;
Journal of computational fluids engineering, volume 6, issue 1, 2001, Pages 1~13
The natural convection heat transfer and solidification in a stratified pool are studied. The flow and heat transfer characteristics in a heat generating pool are compared between single-layered and double-layered pools. And local Nusselt number distributions on outer walls are obtained to consider thermal loads on a vessel wall. The cooling and solidification of Al₂O₃/Fe melt in a hemispherical vessel are simulated to study the mechanism of heat transfer and temperature distribution. A unstructured mesh is chosen for this study because of the non-orthogonality originated from the boundaries of double-layered pool. Interface between the layers is modeled to be fixed. With this assumption mass flux across the interface is neglected, but shear force and heat flux are considered by boundary conditions. The colocated cell-centered finite volume method is used with the Rhie-Chow interpolation to compute cell face velocity. To prevent non-physical solutions near walls in case body force is large the wall pressure is extrapolated by the way to include body force. The numerical solutions calculated by current method show that averaged downward heat flux of the double-layered pool increases compared to single-layered pool and maximum temperature occurs right below the interface of the layers.
Prediction of Axial Pump Performance Using CFD Analysis
Kim M. H. ; Kim J. I. ; Park J. S. ;
Journal of computational fluids engineering, volume 6, issue 1, 2001, Pages 14~20
The CFD analysis of the three-dimensional turbulent flow in the impeller and diffuser of an axial flow pump was performed. Not only the design point but also the off-design points were computed. The results were compared with available experimental data in terms of head generated. At the design point, the analysis accurately predicted the experimental head value. In the range of the higher flow rates, the results were also in very good agreement with the experimental data, not only in absolute value but also in term of slope. Although experimental data to be compared were not available in the range of the lower flow rates, the results well described the S-shape performance curve of the axial pump characteristic.
A Numerical Study on the Similarity of the Developing Laminar Flows between in Orthogonally Rotating Square Duct and Stationary Curved Square Duct
Lee G. H. ; Baek J. H. ;
Journal of computational fluids engineering, volume 6, issue 1, 2001, Pages 21~30
A numerical study on the similarity of the developing laminar flows between in a straight duct rotating about an axis perpendicular to that of the duct and in a stationary curved duct was carried out. In order to clarify the analogy of two flows, dimensionless parameters K/sub LR/ = Re/(equation omitted) and Rossby number, Ro, in a rotating straight duct were used as a set corresponding to Dean number K/sub LC/ = Re/(equation omitted), and curvature ratio, λ, in a stationary curved duct. For the large values of Ro and λ, it is shown that the flow field satisfies the 'asymptotic invariance property', that is, there are strong quantitative similarities between the two flows such as flow patterns, friction factors, and maximum axial velocity magnitudes for the same values of K/sub LR/ and K/sub LC/ if they are correlated with dimensionless axial distances Z/sub R/ = z/(equation omitted) for a rotating duct flow and Z/sub C/ = z/(equation omitted) for a stationary curved duct flow.
Dynamic Large Eddy Simulation of the Vortex Breakdown of Swirling Flow using MPI Parallel Technique
Sung Hong Gye ;
Journal of computational fluids engineering, volume 6, issue 1, 2001, Pages 31~39
A Flow/structure Interaction Analysis for the Design of Medical CSF-Flow Control Valve
Won C. S. ; Hur N. ; Lee C. S. ;
Journal of computational fluids engineering, volume 6, issue 1, 2001, Pages 40~46
Pressure-flow control characteristics of a commercially available cerebrospinal flow(CSF) control shunt valve was studied using flow/structure interaction analyses. Pre-stress of the valve diaphragm(membrane) was accounted for the simulation of an actual valve. The present results were in good agreement with the valve specification listed in the commercially available CSF control valve. The flow/structure interaction analysis of the present study can be effectively used to design a variety of CSF control shunt valves.
Numerical Simulation of Transient Laminar Reacting Flows Around Fuel Droplets
You S. W. ; Kang S. M. ; Kim Y. M. ;
Journal of computational fluids engineering, volume 6, issue 1, 2001, Pages 47~55
The transient laminar reacting flows around fuel droplet have been numerically analyzed. The physical models used in this study can account for the variable thermophysical properties and the chemistry is represent by the one-step global reaction model. The present study is focused on the vaporization and ignition characteristics, flame structure including wake flame, transition flame and envelope flame, and interaction between droplets. Special emphasis is given to the triple flame structure and flame stabilization.
A Numerical Study on Effect of a Partition Wall Height on Wind Pressure Load when KTX passes through a Station
Cho D. ; Hur N. ; Kim S. R. ;
Journal of computational fluids engineering, volume 6, issue 1, 2001, Pages 56~62
A high speed train passing through a station may have undesired effects to passengers on platform due to abrupt pressure transients. Therefore it is very important to reduce the possible degree of danger by installing partition walls in passing lanes in designing the stations having passing train. In the present study, a pressure load to a passenger on platform is studied for the cases of various heights of the partition wall to assess the effectiveness of the wall on the passenger safety. From the results, it is seen that the pressure load on a passenger may be largely reduced by the partition wall. The heights of the partition wall for various passing speed are also studied based on the safety regulation.