Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session L41: Particle-Laden Flows: Particle-Turbulence Interactions II
8:00 AM–10:36 AM,
Monday, November 20, 2023
Room: 206
Chair: Mona Rahmani, University of British Columbia
Abstract: L41.00005 : Inertial chiral particles affect homogeneous turbulence vorticity*
8:52 AM–9:05 AM
Presenter:
Giulia Piumini
(University of Twente)
Authors:
Giulia Piumini
(University of Twente)
Martin Assen
(Univ of Twente)
Detlef Lohse
(University of Twente)
Roberto Verzicco
(Univ of Roma Tor Vergata)
Chirality is a property of anisotropy for which an object is distinguishable from its mirror image. Thanks to this feature, our particles brake spatial reflexion symmetry, coupling translational and rotational degrees of freedom. Moreover, in all our simulations, the carrier and the dispersed phases are two-way coupled and collisions among particles are also taken into account.
We observe a turbulence modulation that increases with the increase of particles volume fraction and the same energy spectra scaling of turbulent bubbly flow. Chiral particles, falling under gravity, show a preferential angular velocity both in quiescent and turbulent flows. The most important evidence of this behaviour is observed in the vorticity statistics, highlighting a Froude number effect. Indeed, we observe a skewed distribution of the vertical vorticity component with a positive or negative peak depending on the particular chirality chosen.
*This work is funded by the Dutch Research Council through the grant OCENW.GROOT.2019.03. We also acknowledge the European High Performance Computing Joint Undertaking (EHPC-REG-2022R03-208) and the national e-infrastructure of SURFsara.
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