7 research outputs found
3D simulation of interdendritic flow through a Al-18wt.%Cu structure captured with X-ray microtomography
A central parameter to describe the formation of porosity and macrosegregation
during casting processes is the permeability of the dendritic mushy zone. To determine this
specific feature for a binary Al-18wt.%Cu alloy, flow simulations based on the Lattice Boltzmann
(LB) method were performed. The LB method allows an efficient solving of fluid flow
problems dealing with complex shapes within an acceptable period of time. The 3D structure
required as input for the simulations was captured with X-ray microtomography, which enables
the generation of representative geometries for permeability investigations. Removing the
eutectic phase from the measured dataset generated a remaining network of solid primary
dendrites. In the simulations, a pressure gradient was applied to force the liquid through the
free interdendritic channels. The permeability of the structure was then calculated from the
resulting flow velocity pattern using Darcy’s law. To examine the influence of different
boundary conditions on the results obtained, several simulations were conducted