Motivated by recent experiments on the hovering of passive bodies, we demonstrate how a simple shape-changing body can hover or ascend in an oscillating background flow. We study this ratcheting effect through numerical simulations of the two-dimensional Navier–Stokes equations at intermediate Reynolds number. This effect could describe a viable means of locomotion or transport in such environments as a tidal pool with wave-driven sloshing. We also consider the velocity burst achieved by a body through a rapid increase in its aspect ratio, which may contribute to the escape dynamics of such organisms as jellyfish.
Skip Nav Destination
Research Article| January 06 2009
Shape-changing bodies in fluid: Hovering, ratcheting, and bursting
Saverio E. Spagnolie;
Saverio E. Spagnolie, Michael J. Shelley; Shape-changing bodies in fluid: Hovering, ratcheting, and bursting. Physics of Fluids 1 January 2009; 21 (1): 013103. https://doi.org/10.1063/1.3054143
Download citation file: