Numerical modeling of filling and solidification for casting problems
Conference
·
OSTI ID:227731
- Ecole des Mines de Nancy (France)
- CISI, Fontaine (France)
- Pechiney, Voreppe (France)
- Aluminium Pechiney, Voreppe (France)
The prediction of feeding defects by a numerical tool must take into account solidification during the filling stage of casting. Although many studies have already been devoted to the modeling of mould filling, only a few of them deal with the problem of simultaneously solving filling coupled with solidification. Moreover, when solidification is considered, the fluid flow in the mush zone is computed by increasing the viscosity in the Navier Stokes equation and the shrinkage effect is neglected. More realistic models have been developed with a drag force such as the Darcy law added to the Navier Stokes equation in order to describe the fluid flow in the mush zone, but these models have generally been used to solve solidification problems without filling. Two numerical models which take into account heat, mass and momentum transfers in metal and heat transfer in the mould are presented. These models are based on the concept of continuous equivalent medium. The first model takes into account the fluid flow in the mush zone with a Darcy term added to the Navier Stokes equation. The solid phase is considered to be fixed in this case. In the second model, the velocity of the solid phase is assumed to be equal to the velocity of the liquid phase. The results obtained with the two models are compared. The effects of various parameters, for example overheat, pressure of the liquid metal at the inlet, microstructure size, temperature range of solidification, on the tendency to form feeding defects are discussed. Predicted tendencies are in agreement with observations reported in the literature.
- OSTI ID:
- 227731
- Report Number(s):
- CONF-9509118--; ISBN 0-87339-297-3
- Country of Publication:
- United States
- Language:
- English
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