Simulation of Macrosegregation in Low-Frequency Electromagnetic Casting by a Meshless Method B. Šarler, B. Mavrič and V. Hatić VIII International Conference on Computational Methods for Coupled Problems in Science and Engineering COUPLED PROBLEMS 2019 E. Oñate, M. Papadrakakis and B. Schrefler (Eds) SIMULATION OF MACROSEGREGATION IN LOW-FREQUENCY ELECTROMAGNETIC CASTING BY A MESHLESS METHOD VANJA HATIĆ * , BOŠTJAN MAVRIČ *,† AND BOŽIDAR ŠARLER *,† * Institute of Metals and Technology Lepi pot 11, 1000 Ljubljana, Slovenia Web page: https://www.imt.si † Faculty of Mechanical Engineering, University of Ljubljana Aškerčeva 6, 1000 Ljubljana, Slovenia Web page: https://www.fs.uni-lj.si/ email: bozidar.sarler@fs.uni-lj.si Key words: low-frequency electromagnetic casting, macrosegregation, solidification model. Abstract. The novel use of a meshless numerical approach for simulation of macrosegregation in the low-frequency electromagnetic casting is presented along with the analysis of the simulation results. The casting model includes a coupled set of mass, momentum, energy, and species conservation equations. Lorentz force is computed with the induction equation and used in the solidification model. The coupled physical model is solved in cylindrical coordinate system and can be used to model aluminium alloy billet production. Explicit scheme is used for the temporal discretization, while the meshless diffuse approximate method is used for the spatial discretization. The method is localized with subdomains containing 14 local nodes. The Gaussian weight is used in the weighted least squares minimization. Furthermore, the Gaussian is shifted upstream, when an upwind effect is required in order to increase the convection stability. Direct chill casting under the influence of electromagnetic field (EMF) is simulated for various electric amplitudes and currents. The material properties of Al-5.25wt%Cu are used. The casting parameters and material properties are constant in all presented simulations, while EMF is turned off in some cases in order to study its effect on solidification. The results show that EMF has a large effect on the melt-flow and solidification. Oscillatory, instead of a steady- state, solution is obtained in case of certain geometries in EMF casting. The effect of EMF is hard to predict without the use of numerical simulations, due to strong coupled effects of casting geometry, casting parameters, and EMF parameters. This shows the need for numerical modelling of this strongly coupled problem for its better understanding. 1 INTRODUCTION Macrosegregation is the chemical inhomogeneity of the composition on the macro-scale level. It is an unavoidable consequence of solidification and one of the major casting defects. It reduces the product quality and is impossible to remove with post-process treatments. The industrial experiments are very expensive and often not possible to perform. That is why the numerical models for prediction of macrosegregation are employed. They can successfully be used to optimize the casting parameters and increase the finished product value. Macrosegregation is caused by various physical phenomena: convection-driven flow, 118