Pseudo-turbulence in two-dimensional buoyancy-driven bubbly flows: A DNS study
TIFR Center for Interdisciplinary Sciences, Tata Institute of Fundamental Research, 500046, Gopanpally, Hyderabad, India
Accepted: 2 November 2020
Published online: 25 November 2020
We present a direct numerical simulation (DNS) study of buoyancy-driven bubbly flows in two dimensions. We employ the volume of fluid (VOF) method to track the bubble interface. To investigate the spectral properties of the flow, we derive the scale-by-scale energy budget equation. We show that the Galilei number (Ga) controls different scaling regimes in the energy spectrum. For high Galilei numbers, we find the presence of an inverse energy cascade. Our study indicates that the density ratio of the bubble with the ambient fluid or the presence of coalescence between the bubbles does not alter the scaling behaviour.
Key words: Flowing Matter: Liquids and Complex Fluids
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2020