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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 8, Issue 4 - Dec 2003
Volume 8, Issue 3 - Sep 2003
Volume 8, Issue 2 - Jun 2003
Volume 8, Issue 1 - Mar 2003
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Computations of Supersonic Flow with Ristorcelli′s Compressible Turbulence Model
Park C. H ; Park S. O ;
Journal of computational fluids engineering, volume 8, issue 3, 2003, Pages 1~6
Three-dimensional endwall flow within a linear cascade passage of high performance turbine blade is simulated with a 3-D Wavier-Stokes CFD code (MOSA3D), which is based on body-fitted coordinate system, pressure-correction and finite volume method. the endwall flow characteristics, including the development and generation of horseshoe vortex, passage vortex, etc. are clearly simulated, consistent with the generally known tendency The effects of both turbulence model and convective differencing scheme on the Prediction performance of endwall flow are systematically analyzed in the present paper. The convective scheme is found to have stronger effect than the turbulence modei on the prediction performance of endwall flow. The present simulation result also indicates that the suction leg of the horseshoe vortex continues on the suction side until it reaches the trailing edge.
Drag Assessment of Transonic Missile due to Engine Plume
Ahn C. S ; Jung S. Y ;
Journal of computational fluids engineering, volume 8, issue 3, 2003, Pages 7~11
Accurate assessment of the effect of jet plume on the boattail pressure drag of transonic airbreathing missiles is very important to reduce drag and to satisfy the flight range and the required maneuver. Numerical results of drag analysis for boattail and base pressures due to jet plume are presented considering the turbulence modeling. Drag assessment due to the size of jet plume, the conditions of the exhaust gas, the configurations of the boattail, and transonic mach numbers is included.
Numerical Analysis of Solidification and Melting Phase Change Using Modified PISO algorithm
Kang K. G ; Ryou H. S ; Hur N. ;
Journal of computational fluids engineering, volume 8, issue 3, 2003, Pages 12~20
A numerical procedure for the calculation of solidification and melting phase change using PISO algorithm is presented. In case of phase change problem, the coupling between velocity/pressure/temperature and liquid fraction is important. The converged temperature and liquid fraction solution which satisfies the energy balance is acquired by applying enthalpy method into inner iteration in matrix solver. And a modified PISO algorithm version is introduced to properly solve the coupling between velocity/pressure/temperature and liquid fraction. A comparison of the proposed procedure with a standard iterative method shows improvement both in terms of computing speed and robustness.
Accurate Multi-level Schemes for Advection and Acoustics
Kim C. W ;
Journal of computational fluids engineering, volume 8, issue 3, 2003, Pages 21~31
A non-dissipative and very accurate one-dimensional upwind leapfrog method is extended to higher-order and multi-dimensional advection and acoustic equations. The higher-order versions are developed by extending the stencils in space and time. The schemes are then successfully applied to the classical test cases for advection and acoustics.
Computational Performance Prediction of Main Coolant Pump for the Integral Reactor SMART
Kim M. H ; Lee J. S ; Park J. S ; Kim J. I ; Kim K. K ;
Journal of computational fluids engineering, volume 8, issue 3, 2003, Pages 32~40
CFD analyses of the three-dimensional turbulent flow in the impeller and diffuser of an axial flow pump including suction and discharge parts are presented and compared with experimental data. The purpose of the current study is to validate the CFD method for the performance analysis of the main coolant pump for SMART and to investigate the effect of suction and discharge shapes on the pump performance. To generate a performance curve, 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 predicts the experimental head value. In the range of the higher flow rates, the results are also in very good agreement with the experimental data, in magnitude but also in terms of slope of variation. For lower flow rates, the results shows that the analysis considering the suction and discharge well describe the typical S-shape performance curve of the axial pump.
A Study of Optimal Mesh Interface Region Generation to Improve Spatial and Temporal Accuracy
Cho Kum Won ;
Journal of computational fluids engineering, volume 8, issue 3, 2003, Pages 41~49
The spatial accuracy becomes first-order when second-order conservation schemes including the non-conservative interpolation in general Chimera method are used. To ensure the solution accuracy, the discontinuities must be located away from the overlapped regions, and the length of overlapped region also must be proportional to the grid spacing. In this paper, a proposed method, cut-paste algorithm, is used to satisfy above constraints. The cut-paste algorithm can generate the optimal mesh inteface region automatically, To validate the spatial and temporal accuracy due to the non-conservative interpolation, inviscid and viscous problems are tested.
Turbulent Flow Analysis of a Circular Cylinder Using a Fractional Step Method with Compact Pade Discretization
Chung S. H ; Park K. S ; Park W. G ;
Journal of computational fluids engineering, volume 8, issue 3, 2003, Pages 50~55
Recent numerical simulation has a tendency to require the higher-order accuracy in time, as well as in space. This tendency is more true in LES and acoustic noise simulation. In the present work, the accuracy of a Fractional step method, which is widely used in LES simulation, has been increased to the fourth-order accurate compact Pade discretization. To validate the present code, the flow-field past a cylinder was simulated and compared with experiment. A good agreement with experiment was achieved.
Development of a Thermal Analysis Program for a Regenerative Cooling Passage of Liquid Rocket and Simulation of Turbulent Heat Transfer
Park T. S ;
Journal of computational fluids engineering, volume 8, issue 3, 2003, Pages 56~65
A numerical procedure for analyzing the heat transfer in a regenerative cooling passage of liquid rocket has been developed. The thermal analysis is based on the numerical model of Naraghi〔1〕. The thermodynamic and transport properties of the combustion gases are evaluated using the chemical equilibrium composition. The pressure and heat flux obtained by the isentropic relation are in good agreement with the result of Navier-Stokes equations. The effect of design parameters on heat transfer is addressed for the pressure loss and temperature variation. Also, their constraints in designing the cooling passage are recommended. Finally, in a heated rectangular duct, the effects of secondary flow on heat transfer are scrutinized by the nonlinear k- e -fu of Park et at.〔2〕.
충남대학교 항공우주공학과 전산유체역학 연구실 소개
Journal of computational fluids engineering, volume 8, issue 3, 2003, Pages 66~70