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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of computational fluids engineering
Journal Basic Information
Journal DOI :
Korea Society of Computational Fluids Engineering
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Volume & Issues
Volume 5, Issue 3 - Dec 2000
Volume 5, Issue 2 - Sep 2000
Volume 5, Issue 1 - May 2000
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Numerical analysis on the characteristics of disel spray for variation of injection spray angle and swirl ratio.
Jung H. ; Cha K. S. ; Park C. G. ;
Journal of computational fluids engineering, volume 5, issue 3, 2000, Pages 1~7
In high-pressure diesel engine, the injected fuel spray impinges on the piston cavity surface due to the short distance between the injection nozzle and the cavity wall. The behavior of the impinging spray has the great influence on the dispersion of fuel, the evaporation, and the mixture formation process. In this study, the numerical simulation using the GTT code was performed to study the gas flows, the spray behaviors, and the fuel vapor distributions in the combustion of a D.I engine for variation of spray angle and swirl ratio.
Effects of the angle of secondary air inlet on the uniformity of temperature distribution inside an incinerator
Kim S. J. ; Min I. H. ; Park M. H. ; Park M. J. ;
Journal of computational fluids engineering, volume 5, issue 3, 2000, Pages 8~15
This research is aimed to find out how the inlet angle of secondary air affects the uniformity of temperature distribution inside a small incinerator. A commercial code, PHOENICS, is used to simulate the thermal-flow field of an incinerator. The computational grid system is constructed by Multi-Block technique provided by PHOENICS. Numerical experiments are done with the five different angles of secondary air inlet. The uniformity of temperature distribution is evaluated by checking the standard deviation of temperature distribution in an incinerator. The computational results show that there is the minimum value of standard deviation at the certain angle of secondary air inlet, which means that there is an optimum angle of secondary air inlet that could improve the uniformity of temperature distribution in an incinerator. The optimum angle of secondary air inlet is between 30 degree and 45 degree in this particular case.
Prediction of Deformation of an Oil-fence by using Fluid
Structure Interaction Method
Kim T. G. ; Kim W. ; Hur N. ;
Journal of computational fluids engineering, volume 5, issue 3, 2000, Pages 16~22
In the present study a method of computing fluid-structure interaction is presented to simulate the deformation shape of an oil fence which is used to contain or to divert the split oil in sea water. The computation is performed by taking into account of the force and moment balance in each computational element of the oil fence. The forces and moments acting on each element of the structure is computed from the flow analysis, which in turn is used to predict deformed shape of the structure until the procedure converges. The flexibility of the oil fence was also considered in the analysis. It is shown from the present study that the predicted deformed shapes agree quite well with the available experiment data.
Numerical study of Three-Dimensional Viscous Flow and Compression Wave Induced by the High Speed Train Entering into a Tunnel
Shin C. H. ; Park W. G. ;
Journal of computational fluids engineering, volume 5, issue 3, 2000, Pages 23~31
The three-dimensional unsteady compressible Full Navier-Stokes equation solver with sliding multi-block method has been applied to analyze three dimensional characteristics of the viscous flow field and compression wave around the high speed train which is entering into a tunnel. The numerical scheme of AF + ADI was used to efficiently solve Navier-Stokes equations in the curvilinear coordinate system. The vortex formation owing to the viscous interaction around the train was found and the generation of compression wave due to the blockage effects was observed ahead of the train in the form of plane wave. The three dimensional characteristics of the flow field compared to the analytic results were discussed in detail. The variation of pressure of tunnel wall surface and velocity profile of the train are identified as the train enters into a tunnel. The changes in aerodynamic forces and streamlines of each specific sections are also discussed.
SUPERSONIC WING-NACELLE CONFIGURATION DESIGN USING AN UNSTRUCTURED ADJOINT METHOD
Kim Hyoung-Jin ; Obayashi Shigeru ; Nakahashi Kazuhiro ;
Journal of computational fluids engineering, volume 5, issue 3, 2000, Pages 32~39
Transition to Oscillatory Natural Convection in a Wide-gap Horizontal Cylindrical Annulus: Pr=0.1
Yoo Joo-Sik ; Kim Yong-Jin ; Eom Yong-Kyoon ;
Journal of computational fluids engineering, volume 5, issue 3, 2000, Pages 40~46
Natural convection in a wide-gap horizontal annulus is considered, and the transition of flows from steady to oscillatory convection is investigated for the fluid with Pr=0.1. The unsteady streamfunction-vorticity equation is solved with finite difference method. As Rayleigh number is increased, the steady crescent-shaped flow bifurcates to a time-periodic flow with like-rotating eddies. And afterwards, a transition to an oscillatory multicellular flow with a counter-rotating eddy on the top of the annulus occurs. A transition from steady to an oscillatory flow occurs, but dual solutions and hysteresis phenomena are not observed.