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Stokesian Dynamics simulation of Brownian suspensions

Phung, Thanh N. and Brady, John F. and Bossis, Georges (1996) Stokesian Dynamics simulation of Brownian suspensions. Journal of Fluid Mechanics, 313 . pp. 181-207. ISSN 0022-1120.

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The non-equilibrium behaviour of concentrated colloidal dispersions is studied by Stokesian Dynamics, a general molecular-dynamics-like technique for simulating particles suspended in a viscous fluid. The simulations are of a suspension of monodisperse Brownian hard spheres in simple shear flow as a function of the Péclet number, Pe, which measures the relative importance of shear and Brownian forces. Three clearly defined regions of behaviour are revealed. There is first a Brownian-motion-dominated regime (Pe ≤ 1) where departures from equilibrium in structure and diffusion are small, but the suspension viscosity shear thins dramatically. When the Brownian and hydrodynamic forces balance (Pe ≈ 10), the dispersion forms a new ‘phase’ with the particles aligned in ‘strings’ along the flow direction and the strings are arranged hexagonally. This flow-induced ordering persists over a range of Pe and, while the structure and diffusivity now vary considerably, the rheology remains unchanged. Finally, there is a hydrodynamically dominated regime (Pe > 200) with a dramatic change in the long-time self-diffusivity and the rheology. Here, as the Péclet number increases the suspension shear thickens owing to the formation of large clusters. The simulation results are shown to agree well with experiment.

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Additional Information:© 1996 Cambridge University Press. Received 23 October 1995 and in revised form 21 December 1995. The work was supported in part by grants CTS-9020646, CTS-9420415, and INT- 9415673 from the National Science Foundation and by an allocation of computer time at the San Diego Supercomputer Center.
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Official Citation:Stokesian Dynamics simulation of Brownian suspensions preview Thanh N. Phung, John F. Brady and Georges Bossis Journal of Fluid Mechanics / Volume 313 / pp 181 - 207 1996 Cambridge University Press Published online: 26 April 2006 DOI:10.1017/S0022112096002170
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:29214
Deposited By: Ruth Sustaita
Deposited On:09 Feb 2012 16:29
Last Modified:26 Dec 2012 14:49

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