Turbulence effect on clustering in bubble swarms using DNS and front-tracking
Résumé
We investigate cluster's formation in bubbles' swarms using direct numerical simulations and the Front-Tracking method for bubbles' motions. Void fractions of 3 % and 6 % are simulated with and without a background forcing turbulence. The bubbles' concentration is measured using Voronoi volumes computed from the bubbles' mass centres. We show a clear effect of turbulence on the probability density function of Voronoi volumes as it increases the probability of extreme values. Common scalings based on standard deviation and analytical functions are investigated and show only a partial fit with our data suggesting a different cluster mechanism.
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