Network model of fluid flow in semi-solid aluminum alloys

A network model is presented to simulate solidification and fluid flow within a semi-solid aluminum alloy. The model consists of a set of connected channels representing the interdendritic liquid and its possible flow directions at high solid fractions (>0.7). The individual channels react according to solidification rules upon liquid solute convection and changes of the local temperature. This dynamic network model has been designed in such a way that a qualitative study of the interaction between the channels is possible. The simulations of the alloys considered show good agreement with the expected macroscopic fluid flow behavior. The simulations indicate a possible reason for deviations from the Kozeny–Carman relationship in measurements of semi-solid alloys.