Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session D20: Active Matter in Complex Environments II
3:00 PM–6:00 PM,
Monday, March 14, 2022
Room: McCormick Place W-185BC
Sponsoring
Units:
DSOFT DBIO GSNP DFD
Chair: Tapomoy Bhattacharjee, Princeton
Abstract: D20.00015 : Kelvin-Helmholtz Instability in Two Dimensional Semi-bounded Active Yukawa Liquids
5:48 PM–6:00 PM
Presenter:
Soumen D Karmakar
(Institute for Plasma Research, Bhat, Gandhinagar, Gujarat-382428, India)
Authors:
Soumen D Karmakar
(Institute for Plasma Research, Bhat, Gandhinagar, Gujarat-382428, India)
Rajaraman Ganesh
(Institute for Plasma Research, Bhat, Gandhinagar, Gujarat-382428, India)
In the present work, considering a two-dimensional semi-bounded cartesian domain, we systematically investigate the effect of activity, internal drives at the smallest scales of the system, on the growth, evolution, and saturation of KH instability, using Molecular Dynamics simulation[1], wherein a Yukawa liquid is used as a prototype. In particular, by increasing the percentage and the activity strength of the active particles, we demonstrate that activity increases the growth rate of the unstable spectrum[2]. Interestingly, it is found that the presence of activity not only alters the growth and the corresponding vortex dynamics, but also changes the bulk flow dynamics away from shear layers[2]. Our findings may have direct impact on a range of physics issues - from our understanding of biological active matter embedded in fluid flows to physics of mixing.
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