NUMERICAL SIMULATION METHODS TO PREDICT THE GAS POROSITY DEFECTS
The numerical simulation is the one of the most effective methods to elucidate the mechanism of the generation of gas porosity in molten metal. There are two methods to consider the effect of pressure in the gas bubbles surrounded by the molten metal. One is the void region numbering method in one phase flow simulation and the other is the density tracing method in two phase flow simulation. In this study, the two simulation methods were compared. In the void region numbering method, the pressure inside the gas bubbles is computed by the ideal gas law. So the local pressure difference in a same connected gas bubble can not be calculated while it can be calculated accurately by the two phase flow simulation. The CPU time used for air bubbles tracing by the void region numbering method is much shorter than that of the density tracing method while the both methods are showing reasonable agreement about the prediction of porosity defect generations.
Numerical simulation Prediction methods Gas porosity
Jun-Ho HONG Young-Sim HOI Ho-Young HWANG Jeong-Kil CHOI
Center For e-Design, Korea Institute of Industrial Technology, 7-47, Songdo-Dong, Yeonsu-Gu, Incheon,406-840, South Korea
国际会议
大连
英文
591-598
2007-08-19（万方平台首次上网日期，不代表论文的发表时间）