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Data for Numerical simulation of a confined cavitating gas bubble driven by ultrasound
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Mifsud, Jacqueline, Lockerby, Duncan A., Chung, Yongmann M. and Jones, Gordon R. (2021) Data for Numerical simulation of a confined cavitating gas bubble driven by ultrasound. [Dataset]
Plain Text (Readme file)
README.txt - Published Version Available under License Creative Commons Attribution 4.0. Download (4Kb) |
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Archive (ZIP) (Dataset)
SupportingDataset.zip - Published Version Available under License Creative Commons Attribution 4.0. Download (217Mb) |
Official URL: http://wrap.warwick.ac.uk/158721/
Abstract
This work investigates the flow disturbance generated by an ultrasonically-driven gas bubble confined in a narrow gap over one acoustic cycle. Here, we provide a more accurate representation of ultrasonic cleaning by implementing a Volume-of-Fluid model in OpenFOAM that simulates the ultrasound as a sinusoidally time-varying pressure boundary condition. A modified Rayleigh-Plesset equation is solved to select an acoustic forcing that instigates bubble collapse. Simulations reveal the interaction between the inflow from the acoustic forcing and the flow deflected by the confining walls intensifies the strength of the self-piercing micro-jet(s), and consequently of the unsteady boundary layer flow, compared to the traditional collapse near a single rigid wall. Depending on the gap height and the position of bubble inception inside the gap, three distinct collapse regimes involving dual-jets or directed-jets are identified, each resulting in a different shear-stress footprint on the confining boundaries. Plots of the spatio-temporal evolution of the shear flow (that is difficult to measure experimentally) reveal peak shear-stress magnitudes at collapse that are double those reported for an undriven laser-induced bubble in similar geometric confinement. This twofold increase is attributed to the ultrasonic signal driving the collapse. Surprisingly, in our simulations we have not encountered a transferred-jet regime previously observed for an unforced bubble collapsing in a similar configuration. This unexpected finding highlights the different physics involved in modelling acoustically-driven bubbles compared to the conventional laser-induced bubbles used in experiments.
Item Type: | Dataset | |||||||||
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Subjects: | Q Science > QA Mathematics Q Science > QC Physics T Technology > TA Engineering (General). Civil engineering (General) |
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | |||||||||
Library of Congress Subject Headings (LCSH): | Computational fluid dynamics, Turbulence -- Simulation methods, Turbulence -- Mathematical models, Boundary layer, Shear flow -- Mathematical models, Shear flow -- Simulation methods, Cavitation, Hydrodynamics | |||||||||
Publisher: | University of Warwick, School of Engineering | |||||||||
Official Date: | 15 November 2021 | |||||||||
Dates: |
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Status: | Not Peer Reviewed | |||||||||
Publication Status: | Published | |||||||||
Media of Output (format): | .csv .txt OpenFOAM files | |||||||||
Access rights to Published version: | Open Access (Creative Commons) | |||||||||
Copyright Holders: | University of Warwick | |||||||||
Description: | The DATA folder contains the dataset supporting the key findings of the above numerical study. The volume-of-fluid (VOF) simulation data provided can be reproduced using the native solver compressibleInterFoam available within any standard OpenFOAM installation. The results of this study were obtained using OpenFOAM 5 (https://openfoam.org/version/5-0/). Please refer to https://cfd.direct/openfoam/user-guide-v5/ for the User Guide. |
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Date of first compliant deposit: | 15 November 2021 | |||||||||
Date of first compliant Open Access: | 15 November 2021 | |||||||||
RIOXX Funder/Project Grant: |
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Contributors: |
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