Collapse of Non-Axisymmetric Cavities

TL;DR

This study investigates how non-axisymmetric cavities formed by a disturbed disk impacting water collapse, revealing phase inversion phenomena across various modes through high-speed imaging.

Contribution

It provides new insights into the collapse dynamics of non-axisymmetric cavities and documents phase inversion across multiple deformation modes.

Findings

Phase inversion occurs during cavity collapse for all modes studied.

High-speed imaging captures characteristic features of collapse.

Different modes exhibit distinct collapse behaviors.

Abstract

A round disk with a harmonic disturbance impacts on a water surface and creates a non-axisymmetric cavity which collapses under the influence of hydrostatic pressure. We use disks deformed with mode m=2 to m=6. For all mode numbers we find clear evidence for a phase inversion of the cavity wall during the collapse. We present a fluid dynamics video showing high speed imaging of different modes, pointing out the characteristic features during collapse.