BIO325H5 Lecture Notes - Lecture 6: Jet Propulsion, Vortex Ring, Starting Vortex
Document Summary
Jellyfish swimming involves production of vortices, draw a canoe paddle through water and small vortices trail off the paddle edges. Vortices can contribute to the locomotion of organisms in fluids: this picture is of a vortex forming on the upstream side of a tidal turbine*. Vortices may displace or stay fixed (e. g. , over a drain). 2013 passive energy recapture in jellyfish contributes to propulsive advantage over other metazoans. Proceedings national academy sciences: cnidarian medusae can be bullet-shaped (prolate) or plate-shaped (oblate). Jellyfish locomote by jetting out (incompressible) subumbrella rwater. Their velum has to do with directing the jet. Vortices are involved in jetting and are important to body displacement. But it also needs to be emphasized that swimming in jellyfish is intimately linked to filter feeding: prolate are somewhat streamlined faster swimmers with a larger velum used in jet direction (?). This travels out behind the advancing medusa is.
