In the current use case, we numerically study magnetic assisted abrasive flow machining (MAAFM). We are interested in the effect of an external magnetic field on the performance of the magnetizable abrasive grains. The aims are to provide insights into the mechanism of material removal on the microscale and to optimize the process parameters with the gained knowledge. The simulation involves modeling the hydrodynamics of the carrier fluid, dynamics of the grains, fluid-grain interactions, fluid-surface interactions, grain-surface interactions, and surface deformation and fracture. In order to monolithically deal with the multi-physics of the problem governing equations of all phases namely fluid, grains and surface are discretized by using the Smoothed Particle Hydrodynamics (SPH) method in SimPARTIX. Being a Lagrangian particle method, SPH is able to easily handle large deformations, e.g., fluid flows and, moving boundaries and suspended rigid bodies. Besides, SPH is cable of tracking topological changes due to surface abrasion and therefore maintain fluid-structure interactions throughout the course of the process in a straightforward manner. Grains are discretized by particles that are rigidly connected and their dynamics are determined by using a rigid body motion solver. This gives us the freedom of modeling grains with arbitrary geometries (see figure). Furthermore, to be able to study the effect of magnetism in the MAAFM process, the dipolar forces caused by an external field or by the stray fields of surrounding grains are included in the calculations.

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