Methods and systems relating to undulating motion

摘要

Methods and systems are disclosed which make use of undulating motion imparted to a body which is situated in a fluid. The body and the fluid have with respect to the other a relative flow in a given direction, and the configuration of the body in the fluid is such that the body generates Karman vortices in the fluid, the body being supported in such a way that these vortices result in undulating motion of the body in the fluid. This undulating motion is made use of in a number of different ways.