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Numerical Simulation of the Bubble Cloud Dynamics in an Ultrasound Field

Maeda, Kazuki and Colonius, Tim (2018) Numerical Simulation of the Bubble Cloud Dynamics in an Ultrasound Field. In: Proceedings of the 10th Symposium on Cavitation (CAV2018). American Society of Mechanical Engineers , New York, NY, pp. 795-800. ISBN 9780791861851.

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We use a coupled Eulerian-Lagrangian method to simulate the dynamics of a spherical bubble cloud with various void fractions excited by high-amplitude ultrasound pulses. We consider two cases: a single cycle of a sinusoidal waveform whose wavelength is large compared to the cloud diameter, and multiple cycles with a short wavelength. For the long wavelength, bubble cloud dynamics are nearly spherically symmetric. Bubbles near the periphery grow more than the those close to the center, and the collapse of bubbles propagates inward from the periphery of the cloud. The structure and the dynamics of the cloud are scaled with the cloud interaction parameter introduce by d’Agostino and Brennen. It is shown that polydispersity does not significantly alter the cloud dynamics. In the short wavelength case, the clouds develop an anisotropic structure in the direction of the incident wave propagation. Over a wide range of the void fraction, the distal side of the cloud is shielded from the incident wave and bubbles grow less. As characterized by the center of volume of the cloud, the anisotropy is similar over the range of volume fractions considered. The results of the study can be used to characterize the acoustic cavitation in ultrasound therapies.

Item Type:Book Section
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URLURL TypeDescription Chapter ItemArticle ItemArticle
Maeda, Kazuki0000-0002-5729-6194
Colonius, Tim0000-0003-0326-3909
Additional Information:© 2018 The American Society of Mechanical Engineers. K.M would like to acknowledge the Funai Foundation for Information Technology, for the Overseas Scholarship. This work was supported by the National Institutes of Health under grant P01-DK043881 and in part by the Office of Naval Research under grant N00014-17-1-2676. The simulations presented here utilized the Extreme Science and Engineering Discovery Environment, which is supported by the National Science Foundation grant number CTS120005.
Funding AgencyGrant Number
Funai Foundation for Information TechnologyUNSPECIFIED
Office of Naval Research (ONR)N00014-17-1-2676
Subject Keywords:Dynamics (Mechanics), Computer simulation, Ultrasound, Bubbles
Record Number:CaltechAUTHORS:20190709-092058933
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Official Citation:Maeda, Kazuki, , Colonius, Tim,, 2018. "Numerical Simulation of the Bubble Cloud Dynamics in an Ultrasound Field," Proceedings of the 10th International Symposium on Cavitation (CAV2018), Joseph Katz, ASME, New York, 6 pp.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:96950
Deposited By: Melissa Ray
Deposited On:09 Jul 2019 20:37
Last Modified:09 Mar 2020 13:19

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