2026-10-12T16:12:07Z https://api.figshare.com/v2/oai

oai:figshare.com:article/33831709 2026-09-16T07:47:33Z portal_1197 item_type_3 month_year_09_2026

Data for Numerical simulation of a confined cavitating gas bubble driven by ultrasound Jacqueline Mifsud (17304256) Duncan A. Lockerby (11114529) Yongmann M. Chung (24302828) Gordon R. Jones (7211612) Computational fluid dynamics Turbulence -- Simulation methods Turbulence -- Mathematical models Boundary layer Shear flow -- Mathematical models Shear flow -- Simulation methods Cavitation Hydrodynamics Migrated from ePrints 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.<br><br>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. To aid the simulation setup, OpenFOAM specific terminology (e.g. for typical boundary conditions) has been provided in the journal article whenever possible. 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. Please refer to OpenFOAM's Programmer's Guide for tensor algebra. 2021-11-15T00:00:00Z Dataset Dataset 10.82444/warw.33831709.v1 https://figshare.com/articles/dataset/Data_for_Numerical_simulation_of_a_confined_cavitating_gas_bubble_driven_by_ultrasound/33831709 CC BY 4.0