We investigate the effect of solid phase motion on macrosegregation in an aluminium alloy. A Newtonian mixture with constant density is assumed. The flow pattern is assumed to be laminar. The phase fraction is determined using the lever rule. The coupled system of conservation equations is temporally and spatially discretized using a mixed Euler method and the meshless diffuse approximate method. Advection terms are stabilized using the method of upwind support domains. The solid phase motion is included with a heuristic model, where the solid phase velocity is assumed to be proportional to the mixture velocity through liquid fraction. The results show that solid motion has an essential effect on macrosegregation, as it causes higher mixture velocities and species transport due to the moving solid phase.
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