Near-surface dynamics of a gas bubble collapsing above a crevice

TL;DR

This study numerically investigates how crevice geometry influences the collapse dynamics of gas bubbles above rigid surfaces, revealing effects on jet formation, wave behavior, and erosion potential.

Contribution

It provides new insights into the impact of surface crevices on bubble collapse behavior using advanced numerical simulations.

Findings

Crevice geometry significantly affects collapse dynamics and jet formation.

Wall-pressure distribution correlates with erosion potential.

Flow phenomena are influenced by crevice shape and size.

Abstract

The impact of a collapsing gas bubble above rigid, notched walls is considered. Such surface crevices and imperfections often function as bubble nucleation sites, and thus have a direct relation to cavitation-induced erosion and damage structures. A generic configuration is investigated numerically using a second-order-accurate compressible multi-component flow solver in a two-dimensional axisymmetric coordinate system. Results show that the crevice geometry has a significant effect on the collapse dynamics, jet formation, subsequent wave dynamics, and interactions. The wall-pressure distribution associated with erosion potential is a direct consequence of development and intensity of these flow phenomena.