Showing papers in "Transactions of The Korean Society of Mechanical Engineers B in 1999"

Numerical Simulation on Rising Bubble Behaviors in Water

Abstract: A bubble rising in water was simulated numerically to predict its shape and terminal velocity. The liquid-gas interface was captured using a level set function which is defined as the signed distance from the interface. Since the distance function and its spatial derivative are smooth and continuous. The level set method can be used to compute an interfacial curvature more accurately than such methods using a step function as VOF and CIP methods. The level set method was modified to achieve volume conservation during the whole calculation procedure of transient bubble motion up to steady state. The calculated shape and terminal velocity of the rising bubble showed good agreement with the experimental data reported in the literature within 10% error range. Also, the present method was proven to be applicable to bubble merging phenomenon.

3-D Turbulent Heat & Fluid Flow Analysis with Solidification Under Electro-Magnetic Field

Abstract: In this investigation, 3-D numerical model has been developed to predict turbulent molten steel flow field and solidification phenomena within the thin slab casting mould with electro-magnetic field. The developed numerical model was verified by comparing with experimental data. By using the developed numerical model, the characteristics of EMBR(Electro-Magnetic Brake Ruler)has been investigated in view points of solid shell growth and flow pattern change. From these investigation, it was found that electro-magnetic force changed the flow pattern and solid shell thickness significantly.