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Article
Publication date: 25 February 2014

Sailei Zhang, Jeffrey Yanke, David R. Johnson and Matthew J.M. Krane

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…

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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.

Details

International Journal of Numerical Methods for Heat & Fluid Flow, vol. 24 no. 2
Type: Research Article
ISSN: 0961-5539

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