1210.5464 (Suzanne M. Fielding)

Hydrodynamic suppression of phase separation in active suspensions    [PDF]

Suzanne M. Fielding

We simulate a suspension of active squirming disks over the full range of volume fractions from dilute to close packed, with full hydrodynamics in two spatial dimensions. By doing so we show that "motility induced phase separation" (MIPS), recently proposed to arise generically in active matter, is strongly suppressed by hydrodynamic interactions. We give an argument for why this should be the case, and support it with counterpart simulations of active Brownian disks in a parameter regime more closely akin to hydrodynamic suspensions than in previous studies.

View original: http://arxiv.org/abs/1210.5464