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How do tiny inertial particles behave in a vortex? We revisit this classical problem by incorporating the often-neglected added mass and history forces. Our analysis uncovers additional fixed points beyond the conventional ones, reshaping the trapping landscape, particularly in near density-matched scenarios where added mass becomes significant. Most strikingly, while the absence of the history force permits trapped, diffusive, or ballistic states depending on parameters, its inclusion releases all particles, eliminating trapping and driving them into inevitable long-time ballistic motion.
Kumar et al. (Wed,) studied this question.