title: Hydrodynamic suppression of phase separation in active suspensions.
abstract: We simulate with hydrodynamics a suspension of active disks squirming through a Newtonian fluid. We explore numerically the full range of squirmer area fractions from dilute to close packed and show that "motility induced phase separation," which was recently proposed to arise generically in active matter, and which has been seen in simulations of active Brownian disks, 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 that provides a closer counterpart to hydrodynamic suspensions than in previous studies.
authors.affiliation: Department of Physics, University of Durham, Science Laboratories, South Road, Durham, DH1 3LE, UK.
authors.forename: Ricard
authors.initials: R
authors.lastname: Matas-Navarro
authors.affiliation: Rudolf Peierls Centre for Theoretical Physics, University of Oxford, Oxford, OX1 3NP, UK.
authors.forename: Ramin
authors.initials: R
authors.lastname: Golestanian
authors.affiliation: School of Mathematics, University of Bristol, Clifton, Bristol, BS8 1TW, UK.
authors.forename: Tanniemola B
authors.initials: TB
authors.lastname: Liverpool
authors.affiliation: Department of Physics, University of Durham, Science Laboratories, South Road, Durham, DH1 3LE, UK.
authors.forename: Suzanne M
authors.initials: SM
authors.lastname: Fielding
mesh_terms: D057446:Hydrodynamics; D008962:Models, Theoretical; D009038:Motion; D013535:Suspensions
chemical_list: D013535:Suspensions