Abstract
Purpose – A single-domain multi-phase model is developed for macrosegregation and shrinkage pipe formation in castings, as functions of buoyancy- and shrinkage-induced flow. The paper aims to discuss these issues. Design/methodology/approach – Using a volume of fluid (VOF) method, both the air/liquid and air/solid interfaces are tracked during shrinkage pipe formation. A set of mixture advection-diffusion equations are derived and solved for velocity, temperature, composition, and phase field evolution. The fluid mechanics of the model are verified using a transient ditch drainage problem. Findings – Results showing the interaction of macrosegregation and pipe formation are presented for two alloys under faster and slower cooling conditions. Originality/value – This model provides a comprehensive tool to investigate relationships between the developing composition distribution and shrinkage pipe formation.
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