File(s) under permanent embargo
Comparison of the Rayleigh-Plesset and Gilmore equations and additional aspects for the modelling of seismic airgun bubble dynamics
Seismic airguns are commonly used in geophysical exploration. More recently, they are also being used as an alternative to underwater explosions for the shock testing of defence vessels. The study of the dynamics of the bubble produced by a seismic airgun is beneficial in understanding the resultant pressure field and shockwave.
The Rayleigh–Plesset and Gilmore equations for modelling spherical bubble dynamics are compared for the expansion of an initially highly pressurised gas bubble. The relationship between initial gas pressure and both the first maximum bubble radius and the first period of oscillation are presented. The initial gas pressure is non-dimensionalised against hydrostatic pressure and studied over a range of 1 – 50. The separate contributions of presence of the airgun body, mass throttling, effective viscosity and heat diffusion to the first maximum radius and period are modelled and discussed. The effects of evaporation and condensation at the bubble wall are also considered.
History
Publication title
Proceedings of the 18th Australasian Fluid Mechanics ConferenceEditors
PA Brandner and BW PearcePagination
1-4ISBN
9780646583730Department/School
Australian Maritime CollegePublisher
Australasian Fluid Mechanics SocietyPlace of publication
Launceston, Tasmania, AustraliaEvent title
18th Australasian Fluid Mechanics ConferenceEvent Venue
Launceston, Tasmania, AustraliaDate of Event (Start Date)
2012-12-03Date of Event (End Date)
2012-12-07Rights statement
Copyright 2012 Leishman AssociatesRepository Status
- Restricted