Swell Flapping: Self-Induced Free Surface Oshillation Caused by a Separated Jet (Experiments in rectangular tank)

摘要

A new type of self-induced free surface oscillation (Swell flapping) was discovered in a system with a jet, a free surface and a structure. An upward plane wall jet was injected into a rectangular tank. The jet impinged on the bottom of an Upper-Inner-Structure (UIS), which was set just beneath the free surface and above the jet inlet channel. The jet was separated at the edge of UIS. At a certain jet inlet velocity and UIS depth, the separated jet oscillated, forming a swell of the free surface around UIS.