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Modelling of seismic airgun bubble dynamics and pressure field using the Gilmore equation with additional damping factors

Citation

de Graaf, KL and Penesis, I and Brandner, PA, Modelling of seismic airgun bubble dynamics and pressure field using the Gilmore equation with additional damping factors, Ocean Engineering, 76 pp. 32-39. ISSN 1873-5258 (2014) [Refereed Article]

Copyright Statement

Copyright 2013 Elsevier Ltd.

DOI: doi:10.1016/j.oceaneng.2013.12.001

Abstract

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 separate contributions due to the 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. Gilmore's model is used to predict the radiated pressure wave of the new bubble model. The results are in fair agreement with measured data collected from full scale airgun trials.

Item Details

Item Type:Refereed Article
Keywords:seismic airgun; gilmore equation
Research Division:Engineering
Research Group:Maritime Engineering
Research Field:Maritime Engineering not elsewhere classified
Objective Division:Defence
Objective Group:Defence
Objective Field:Navy
Author:de Graaf, KL (Dr Katrina De Graaf)
Author:Penesis, I (Associate Professor Irene Penesis)
Author:Brandner, PA (Associate Professor Paul Brandner)
ID Code:88177
Year Published:2014
Web of Science® Times Cited:4
Deposited By:NC Maritime Engineering and Hydrodynamics
Deposited On:2014-01-16
Last Modified:2017-11-01
Downloads:0

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