Streaming-reinforced particle transport

Motivated by drug-delivery applications, we investigate the capability of an 'active' body (master) to manipulate a 'passive' object (slave) purely via contactless flow-mediated mechanisms. We extend prior works on active--passive cylinder pairs by superimposing periodic oscillations to the master's linear motion. In a viscous fluid, such oscillations produce an additional viscous streaming field, which is leveraged for enhancing the slave transport. We see that superimposing oscillations robustly improves transport across a range of Reynolds numbers. Comparison with results without oscillations highlights the flow mechanisms at work, which we capitalize on to design (master) geometries for augmented transport.