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- 저자 : 홍준표 ( Sung Bin Kim (검색결과 4 건)
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용탕충진과정에 있어서 열 및 유동을 포함한 2차원 응고해석
김성빈,조인성,김진수,홍준표 ( Sung Bin Kim,In Sung Cho,Jin Su Kim,Chun Pyo Hong ) 한국주조공학회 1993 한국주조공학회지 Vol.13 No.5
N/A A Numerical technique has been developed for the coupled heat transfer and fluid flow calculation during the casting process. In this method the SMAC technique was coupled with the concept of Volume of Fluid(VOF) to calculate melt free surface and velocity profiles within the melt, and the Energy Marker method coupled with the finite difference method was proposed for the convective and conductive heat transfer analysis in the casting. When comparing numerical calculations with experimental observations, a close correlation was evident. It has been shown that this technique is useful for proper gating and casting design, especially for thin-walled castings.
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용탕충전 과정에 있어서 열 및 유동을 포함한 3차원 응고해석
김성빈,홍준표 대한금속재료학회(대한금속학회) 1996 대한금속·재료학회지 Vol.34 No.9
A numerical technique has been developed to simulate the combined fluid flow, heat transfer and solidification during filling of castings. A modified SMAC method was applied to analyze fluid flow during mold filling, and a new concept of energy marker has been proposed not only to track the moving free surface of the melt, but also to calculate convective heat transfer during the mold filling process. The present code was applied to simulate solidification sequences and to predict shrinkage cavities in automobile crank shaft castings. The comparison of two types of solidification analyses, simulations with and without consideration of fluid flow during mold filling revealed that the first method is more effective in evaluating the formation of casting defects. The present model which is based on the coupled analysis of fluid flow and heat transfer during mold filling was successfully applied to predict shrinkage cavities in shaped castings.
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김성빈,홍준표 대한금속재료학회(대한금속학회) 1995 대한금속·재료학회지 Vol.33 No.1
A computational method, which is based on a modified SMAC method, has been developed to analyze three dimensional incompressible viscous flow in mold filling. A marker transport technique was used for the purpose of tracing three-dimensional melt free surfaces, and a marker generation method was adapted to treat an arbitrary number of inlet or outlet boundary conditions for the design of gating systems. In order to enhance the solution accuracy, the convective terms were treated by the hybrid scheme. Simulations were carried out on two types of stepped plate die casting and a three-spoke wheel gravity casting, in order to analyze the filling sequence and to predict cold shut or entrapment of air. Computational results on the two types of stepped plate casting were in good agreements with those of water model experiments.
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이상목,김성빈,홍준표,박중길,이성윤 대한금속재료학회(대한금속학회) 1999 대한금속·재료학회지 Vol.37 No.5
A coupled numerical model was developed to predict macrosegregation in continuously cast steel billets. Continuum formulation was adopted to investigate macroscopic transport behavior of momentum, heat and species in the continuous casting process. In order to model fluid flow damping in the mushy zone solidification was considered to occur in two successive stages. In the first stage with the solid fraction below a certain critical value, the relative viscosity concept was employed to treat fluid flow in the dilute mushy zone. In the second stage with the solid fraction above critical value, the permeability concept was used to treat the concentrated mushy zone as a porous medium. Turbulent fluid flow during continuous casting was treated by the standard k-ε model. Thermal and solutal convections were also considered in the simulation of solute redistribution in the mushy zone. The effect of interdendritic flow on surface temperature, metallurgical length and centerline segregation were investigated. It is suggested that the present model can be successfully applied to simulate the macrosegregation in continuous casting of steel billets.
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