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Effects of arm swing on particle trajectories in HDD using CFD dynamic mesh method

Previous works investigated particle trajectories in hard disk drives (HDDs) with the actuator arm and the head gimbals assembly (HGA) at a fixed position. Actually, internal flow field characteristics of HDDs can be greatly changed by the arm swing during seek operations, which can affect particle trajectories and trapping status. In this paper, using the dynamic mesh method in the computational fluid dynamics (CFD) simulation, Al2O3 particle trajectories considering the arm swing in a 2.5 inch HDD are studied by the CFD solver FLUENT with user-defined functions. The trapping criterion for Al2O3 particles are used as boundary conditions for colliding surfaces.