Coastal erosion caused by cavitation bubble implosion: Micro-view on the bubble dynamics

Q. X. Wang, Y. X. Yang, S. K. Tan

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

Recently, coastal erosion in the form of inertial cavitation has been generally accepted. Air pockets in an incoming wave are forced into the surface of the coastal cliff, and then the force of the wave compresses the air pockets until the bubble implodes, giving off various forms of energy that erode the rock. This paper studies the behaviour of a cavitation bubble in a compressible liquid near a rigid boundary, when it is subjected to a harmonic wave. Because of the extremely short life time of the bubble, we assume the wave pressure acting on the bubble surface is constant. An approximate perturbation theory by using the method of matched asymptotic expansions is used to incorporate the influence of the compressibility of the liquid. The rigid boundary creates an asymmetry in the flow field that causes bubble to collapse non-spherically. A numerical model based on the mixed Eulerian-Lagrangian (MEL) method and the boundary integral method (BIM) for bubble dynamics in a weakly compressible liquid is developed. The shock wave pressure caused by the high speed jet hitting on the rigid boundary is found to be of sufficient magnitude to initiate erosion of the loose boundary.

Original languageEnglish
Title of host publicationAsian and Pacific Coasts, 2011 - Proceedings of the 6th International Conference
EditorsJoseph Hun-Wei Lee, Chiu-On Ng
Publisher[publishername] World Scientific
Pages797-803
Number of pages7
ISBN (Print)9789814366489
DOIs
Publication statusPublished - 2011
Event6th International Conference on Asian and Pacific Coasts, APAC 2011 - Kowloon, Hong Kong
Duration: 14 Dec 201116 Dec 2011

Publication series

NameAsian and Pacific Coasts, 2011 - Proceedings of the 6th International Conference

Conference

Conference6th International Conference on Asian and Pacific Coasts, APAC 2011
Country/TerritoryHong Kong
CityKowloon
Period14/12/1116/12/11

Bibliographical note

Publisher Copyright:
© 2019, World Scientific. All rights reserved.

ASJC Scopus subject areas

  • Aquatic Science
  • Ecology, Evolution, Behavior and Systematics
  • Ecology

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