Parametric internal waves in a compressible fluid

TL;DR

This paper investigates how vibration induces parametric instability in a compressible, density-stratified fluid, leading to internal gravity-acoustic waves similar to Faraday instability, with potential experimental observation near critical points.

Contribution

It introduces the concept of parametric destabilization of internal waves in a compressible fluid due to vibration, extending classical instability theories.

Findings

Vibration can destabilize internal gravity-acoustic waves.

The instability resembles Faraday instability but is modified by compressibility.

Potential for experimental observation near gas-liquid critical points.

Abstract

We describe the effect of vibration on a confined volume of fluid which is density stratified due to its compressibility. We show that internal gravity-acoustic waves can be parametrically destabilized by the vibration. The resulting instability is similar to the classic Faraday instability of surface waves, albeit modified by the compressible nature of the fluid. It may be possible to observe experimentally near a gas-liquid critical point.