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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 7, Issue 4 - Dec 2002
Volume 7, Issue 3 - Sep 2002
Volume 7, Issue 2 - Jun 2002
Volume 7, Issue 1 - Mar 2002
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Finite Element Analysis on Phase-Change Process of Pure Water
Hong Y. D. ; Cha K. S. ; Seo S. J. ; Park C. G. ;
Journal of computational fluids engineering, volume 7, issue 4, 2002, Pages 1~7
The phase-change transformation processes are relevant in many engineering applications. In particular, this phenomenon plays an important role in the extraction and fabrication operations in the metallurgical industry. The control of the heat transfer and fluid flow patterns is important to achieve casting quality and competitive production times. In the present study, a simple finite-element algorithm is developed for solid-liquid phase change problems. Natural convection in the liquid phase due to the temperature dependency of water density is considered by a numerical model. The predictions are compared with measurements by the particle image velocimetry(PIV). to show that the calculation results are in good agreement with the experiment results.
Evaluation of the K-Epsilon-VV-F Turbulence Model for Natural Convection in a Rectangular Cavity
Choi Seok-Ki ; Kim Seong-O ; Kim Eui-Kwang ; Choi Hoon-Ki ;
Journal of computational fluids engineering, volume 7, issue 4, 2002, Pages 8~18
The primary objective of the present study is evaluation of the k-ε-vv-f turbulence model for prediction of natural convection in a rectangular cavity. As a comparative study, the two-layer k-ε model is also considered. Both models, with and without algebraic heat flux model, are applied to the analysis of natural convection in a rectangular cavity. The performances of turbulence models are investigated through comparison with available experimental data. The predicted results of vertical velocity component, turbulent heat fluxes, turbulent shear stress, local Nusselt number and wall shear stress are compared with experimental data. It is shown that, among the turbulence models considered in the present study, the k-ε-vv-f model with an algebraic heat flux model predicts best the vertical mean velocity and velocity fluctuation, and the inclusion of algebraic heat flux model slightly improves the accuracy of results.
Convergence Study of Multigrid Method for K-
Park Soo Hvung ; Sung Chun-ho ; Kwon Jang Hyuk ; Lee Seungsoo ;
Journal of computational fluids engineering, volume 7, issue 4, 2002, Pages 19~27
An efficient implicit multigrid method is presented for the Navier-Stokes and k-ω turbulence equations. Freezing and limiting strategies are applied to improve the robustness and convergence of the multigrid method. The eddy viscosity and strongly nonlinear production terms of turbulence are frozen in the coarser grids by passing down the values without update of them. The turbulence equations together with the Navier-Stokes equations, however, are consecutively solved on the coarser grids in a loosely coupled fashion. A simple limit for k is also introduced to circumvent slow-down of convergence. Numerical results for the unseparated and separated transonic airfoil flows show that all computations converge well without any robustness problem and the computing time is reduced to a factor of about 3 by the present multigrid method.
Development of a General Purpose Program for 3-D Flows -Implementation of a CLSVOF Interface Tracking Method
Sung M. ; Son G. ; Hur N. ;
Journal of computational fluids engineering, volume 7, issue 4, 2002, Pages 28~34
A general purpose program for computing 3-D flows has been extended for two-phase flows with topologically complex interfaces. The 3-D interfaces are tracked by employing a coupled level set and volume-of-fluid (CLSVOF) method which not only can calculate an interfacial curvature accurately but also can achieve mass conservation well. The program has been tested through the computations of bubbles rising in a liquid. The numerical results are found to compare well with the results reported in the literature.
Numerical study of base flow of afterbodies for launch vehicle in supersonic turbulent flow
Park Nam-Eun ; Roh Hyung-Hun ; Kim Jae-Soo ;
Journal of computational fluids engineering, volume 7, issue 4, 2002, Pages 35~41
The projectile afterbodies for zero-lift drag reduction has been analyzed using the Navier-Stokes equations with the κ-εturbidence model. The numerical method of a second order upwind scheme has been used on an unstructured adaptive grid system. Base drag reduction methods that have been found effective on axisymmetric bodies are boattailing, base bleed, base combustion, locked vortex afterbodies and multistep afterbodies. In this paper, turbulence flow and pressure charateristics have been studied for geometries of multistep afterbodies. The important geometrical and flow parameters relevant to the design of such afterbodies have been identified by step number, length and height. The flow over multistep aftoerbodies or base have many kinds of compressible flow characteristics including expansion waves at the trailing edge, recompression waves, separation and recirculating flow in the base region, shear flow and wake flow. The numerical results have been compared and analyzed with the experimental data. The flow characteristics have been clearly shown.
한국과학기술원 항공우주공학 전공 공기역학 실험실 소개
Journal of computational fluids engineering, volume 7, issue 4, 2002, Pages 42~46
서강대학교 기계공학과 전산유체공학 연구실 소개
Journal of computational fluids engineering, volume 7, issue 4, 2002, Pages 47~53