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Title: Brownian dynamics of confined suspensions of active microrollers

Journal Article · · Journal of Chemical Physics
DOI:https://doi.org/10.1063/1.4979494· OSTI ID:1465959

In this study, we develop efficient numerical methods for performing many-body Brownian dynamics simulations of a recently observed fingering instability in an active suspension of colloidal rollers sedimented above a wall [M. Driscoll, B. Delmotte, M. Youssef, S. Sacanna, A. Donev, and P. Chaikin, Nat. Phys. (2016), preprint arXiv:1609.08673. We present a stochastic Adams-Bashforth integrator for the equations of Brownian dynamics, which has the same cost but is more accurate than the widely used Euler-Maruyama scheme, and use a random finite difference to capture the stochastic drift proportional to the divergence of the configuration-dependent mobility matrix. We generate the Brownian increments using a Krylov method and show that for particles confined to remain in the vicinity of a no-slip wall by gravity or active flows, the number of iterations is independent of the number of particles. Our numerical experiments with active rollers show that the thermal fluctuations set the characteristic height of the colloids above the wall, both in the initial condition and the subsequent evolution dominated by active flows. Finally, the characteristic height in turn controls the time scale and wavelength for the development of the fingering instability

Research Organization:
New York Univ. (NYU), NY (United States). Courant Institute of Mathematical Sciences
Sponsoring Organization:
USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR). Scientific Discovery through Advanced Computing (SciDAC)
Grant/Contract Number:
SC0008271
OSTI ID:
1465959
Alternate ID(s):
OSTI ID: 1361804
Journal Information:
Journal of Chemical Physics, Vol. 146, Issue 13; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 23 works
Citation information provided by
Web of Science

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  • Singh, Bhalla, Amneet Pal; Aleksandar, Donev,; Bakytzhan, Kallemov,
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  • The University of North Carolina at Chapel Hill University Libraries https://doi.org/10.17615/schb-ht77
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Cited By (6)

Colloidal Motors 101: A Beginner's Guide to Colloidal Motor Research journal April 2019
Brownian dynamics of fully confined suspensions of rigid particles without Green’s functions journal April 2019
Hydrodynamically bound states of a pair of microrollers: A dynamical system insight journal April 2019
Hydrodynamically-bound states of a pair of microrollers: a dynamical system insight text January 2018
Brownian Dynamics of Fully Confined Suspensions of Rigid Particles Without Green's Functions text January 2019
Leveraging Collective Effects in Externally Driven Colloidal Suspensions: Experiments and Simulations text January 2018

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