Physics of Fluids - Publications

Dynamics of a toroidal bubble on a cylinder surface with an application to geophysical exploration

arΧiv
International Journal of Multiphase Flow 129, 103335 (2020)

Authors

	Shuai Li
	Andrea Prosperetti
	Devaraj van der Meer

BibTeΧ

@article{LI2020103335,
title = "Dynamics of a toroidal bubble on a cylinder surface with an application to geophysical exploration",
journal = "International Journal of Multiphase Flow",
volume = "129",
pages = "103335",
year = "2020",
issn = "0301-9322",
doi = "https://doi.org/10.1016/j.ijmultiphaseflow.2020.103335",
url = "http://www.sciencedirect.com/science/article/pii/S0301932220301580",
author = "Shuai Li and Andrea Prosperetti and Devaraj [van der Meer]",
keywords = "Bubble dynamics, Seismic airgun source, Boundary integral method, Geophysical exploration, Fluid-structure interaction",
abstract = "During the operation of a seismic airgun source, a certain amount of compressed high-pressure air is released from the airgun chamber into the surrounding water, generating an expanding toroidal bubble attached to the airgun-body. The subsequent oscillations of the bubble generate low-frequency pressure waves, which are used to map the ocean subbottom, e.g., to locate oil and gas reserves. The bubble dynamic behavior and the emitted pressure waves are inevitably influenced by the airgun-body. However, the bubble-airgun-body interaction is far from well understood. This paper investigates the strong interaction between a long cylinder and an attached toroidal bubble via hundreds of boundary integral simulations, aiming to provide new physical insights for airgun-bubble dynamics. Firstly, the overall physical phenomena are discussed and three types of bubble collapse patterns are identified, namely (i) upward jetting due to gravity, (ii) annular jet toward the cylinder body and (iii) weak/no jet. Thereafter, we investigate the effects of the cylinder radius, initial bubble pressure and Froude number on the bubble oscillation period and the pressure wave induced by the bubble. At last, the impact of a cylinder on a Sercel type airgun-bubble is discussed with a particular focus on the spectrum of the pressure waves."
}