Binary-fluid turbulence: Signatures of multifractal droplet dynamics and dissipation reduction

Pal, Nairita and Perlekar, Prasad and Gupta, Anupam and Pandit, Rahul (2016) Binary-fluid turbulence: Signatures of multifractal droplet dynamics and dissipation reduction. In: PHYSICAL REVIEW E, 93 (6).

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Abstract

We study the challenging problem of the advection of an active, deformable, finite-size droplet by a turbulent flow via a simulation of the coupled Cahn-Hilliard-Navier-Stokes (CHNS) equations. In these equations, the droplet has a natural two-way coupling to the background fluid. We show that the probability distribution function of the droplet center of mass acceleration components exhibit wide, non-Gaussian tails, which are consistent with the predictions based on pressure spectra. We also show that the droplet deformation displays multifractal dynamics. Our study reveals that the presence of the droplet enhances the energy spectrum E(k), when the wave number k is large; this enhancement leads to dissipation reduction.

Item Type:	Journal Article
Publication:	PHYSICAL REVIEW E
Publisher:	AMER PHYSICAL SOC
Additional Information:	Copy right for this article belongs to the AMER PHYSICAL SOC, ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	17 Aug 2016 04:10
Last Modified:	17 Aug 2016 04:10
URI:	http://eprints.iisc.ac.in/id/eprint/54263

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