Topical Problems of Fluid Mechanics


Institute of Thermomechanics AS CR, v.v.i.	CTU in Prague Faculty of Mech. Engineering Dept. Tech. Mathematics	MIO Université du Sud Toulon Var - AMU - CNRS - IRD	Czech Pilot centre ERCOFTAC

3D Unsteady Motion and Deformation of a Gas Bubble in Vibrating Liquid under Zero Gravity
Galusinski C., Lyubimova T. P., Meradji S.
Abstract:
Numerical investigation of a bubble immersed in a liquid of different density inside a container subjected to translational oscillations under weightlessness reveals the following scenario: the bubble, initially centered, moves toward the container wall due to a non-viscous attraction mechanism. This motion is accompanied by small-amplitude oscillations at the forcing frequency and long-period eigen-oscillations induced by the initial acceleration. Concurrently, the bubble shape deforms, averaging over the forcing period, with flattening along the vibration axis and, under certain conditions, exhibiting parametric oscillations. A notable deceleration occurs as the bubble approaches the wall, stopping at a finite distance from the wall, without making contact.
Keywords:
drops (bubbles), interfacial flows, instability, level set method

Fulltext: PDF DOI: https://doi.org/10.14311/TPFM.2025.012

In Proceedings Topical Problems of Fluid Mechanics 2025, Prague, 2025, Edited by David Šimurda and Tomáš Bodnár, pp. 83 ISBN 978-80-87012-05-5 (Print) ISSN 2336-5781 (Print)