Expansion and collapse of single cavitation bubbles right at a solid boundary

Lechner, Christiane; Koch, Max; Lauterborn, Werner; Mettin, Robert

Record link:

http://hdl.handle.net/20.500.12708/80597

Title:

Expansion and collapse of single cavitation bubbles right at a solid boundary

Citation:

Lechner, C., Koch, M., Lauterborn, W., & Mettin, R. (2022). Expansion and collapse of single cavitation bubbles right at a solid boundary. In J. VAD (Ed.), Proceedings of the Conference on Modelling Fluid Flow CMFF’22 (pp. 483–490). Department of Fluid Mechanics Budapest University of Technology and Economics. http://hdl.handle.net/20.500.12708/80597

CatalogPlus:

AC17319278

Publication Type:

Inproceedings - Full-Paper Contribution

Language:

English

Authors:

Lechner, Christiane
Koch, Max
Lauterborn, Werner
Mettin, Robert

Organisational Unit:

E322-02 - Forschungsbereich Numerische Strömungsmechanik

Published in:

Proceedings of the Conference on Modelling Fluid Flow CMFF'22

ISBN:

978-963-421-881-4

Date (published):

16-Sep-2022

Event name:

Conference on Modelling Fluid Flow (CMFF’22)

Event date:

30-Aug-2022 - 2-Sep-2022

Event place:

Budapest, Hungary

Number of Pages:

Publisher:

Department of Fluid Mechanics Budapest University of Technology and Economics, Budapest, Hungary

Peer reviewed:

Yes

Keywords:

bubble dynamics; cavitation; erosion; finite volume method; jet formation

Abstract:

We present results from numerical simulations modeling the dynamics of single (laser-generated) cavitation bubbles expanding and collapsing right at a plane solid boundary. The model consists of a bubble filled with a small amount of non-condensable gas in a compressible liquid. The Navier-Stokes equations are discretized with the finite volume method. The volume of fluid method is used to capture the interface between liquid and gas. The model is implemented in the open source software package OpenFOAM. A millimeter sized bubble in water serves as reference to discuss bubble dynamics. The most intriguing phenomenon that occurs in this configuration is the formation of a fast jet that is directed towards the solid with a speed of the order of 1000 m/s. The jet formation mechanism is explained. Paradoxically, in this setting, jet formation causally is related to the viscosity of the liquid. Bubble size and liquid viscosity are varied. It is shown that fast jet formation persists for a wide range of liquid viscosities, including e.g.~50 cSt silicone oil. Bubble dynamics and the jet formation mechanism are discussed for values of a bubble Reynolds number, $\Reyb$, ranging from 15 to 50 000, with fast jet formation occurring for $\Reyb \gtrsim 300$.

Project title:

Komplexe Dynamik von Kavitationsblasen an Objekten: I5349-N (Fonds zur Förderung der wissenschaftlichen Forschung (FWF))

Project (external):

DFG

Project ID:

ME 1645/8-1, ME 1645/8-3, ME 1645/5-2

Link (external):

https://www.cmff.hu/papers/CMFF22_Final_Paper_PDF_91.pdf

Research Areas:

Computational Fluid Dynamics: 50%
Modeling and Simulation: 50%

Science Branch:

1030 - Physik, Astronomie: 100%