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Summary

This study simulates gas bubble collapse in water, revealing how shock waves and bubble dynamics near surfaces generate damaging water-hammer shocks. Understanding these phenomena is crucial for predicting and mitigating potential surface damage.

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Area of Science:

Fluid dynamics
Acoustics
Computational physics

Background:

Collapsing bubbles generate powerful shock waves.
Understanding bubble collapse dynamics is key to assessing damage to nearby surfaces.

Purpose of the Study:

To analyze the dynamics of shock-induced and Rayleigh collapse of gas bubbles near rigid surfaces.
To quantify collapse times, bubble displacements, interfacial velocities, and surface pressures.
To investigate the generation and impact of shock waves during bubble collapse.

Main Methods:

Utilized a high-order accurate shock- and interface-capturing scheme for numerical simulation.
Analyzed bubble collapse in both free field and near a planar rigid surface.
Quantified key parameters as a function of pressure ratio and bubble stand-off distance.

Main Results:

Simulations showed good agreement with existing theory and experiments.
Observed non-spherical collapse forming re-entrant jets, leading to high velocities.
Identified precursor and water-hammer shocks, with water-hammer shocks generating significant wall pressures.

Conclusions:

Bubble collapse, especially shock-induced, can create intense localized pressures.
The study quantifies conditions for shock amplification due to bubble collapse.
Results provide insights into the mechanisms of surface damage caused by collapsing bubbles.