Towards the modelling of fluid-structure interactive lost core deformation in high-pressure die casting

This paper investigates the fluid-structure interaction (FSI) that would be expected to occur when a lost core deforms in high-pressure die casting. A two-phase compressible Volume of Fluid approach is used to model the fluid. The turbulence contribution to the Navier-Stokes equations is accounted for by using the Reynolds-averaged Navier Stokes (RANS) Menter SST k−ω model, whilst an isotropic linear elastic model is assumed for the core material itself. The computed results for the core deformation were compared to those obtained for test bodies manufactured by high-pressure die casting, and good agreement was found. An interesting and surprising feature of both the experimental and theoretical results was that the core was found to bend in the direction opposite to that expected from intuition and to that obtained by an earlier model that did not use FSI.