Prospects for the practical application of the open phenomenon "Abnormally high amplitude of self-oscillation" for the fluid flow

Abstract

The outflow of an incompressible fluid from a rectangular opening covered by a semicircular arched element is considered. The self-oscillatory expiration regime is numerically investigated. The computational algorithm implemented in the STAR-CCM+ software package includes a grid approximation in space, an implicit time integration method, and an algebraic multi-grid method for solving systems of algebraic equations. A variant of the hole geometry with an aspect ratio of is considered. An explanation is given to the mechanism of the self-oscillatory process. The distribution of oscillation amplitude values in space at the exit from the hole is determined. Some possibilities of practical application of the described phenomenon are determined.