title: Globally aligned states and hydrodynamic traffic jams in confined suspensions of active asymmetric particles.
abstract: Strongly confined active liquids are subject to unique hydrodynamic interactions due to momentum screening and lubricated friction by the confining walls. Using numerical simulations, we demonstrate that two-dimensional dilute suspensions of fore-aft asymmetric polar swimmers in a Hele-Shaw geometry can exhibit a rich variety of novel phase behaviors depending on particle shape, including coherent polarized density waves with global alignment, persistent counterrotating vortices, density shocks and rarefaction waves. We also explain these phenomena using a linear stability analysis and a nonlinear traffic flow model, both derived from a mean-field kinetic theory.
authors.affiliation: Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.
authors.forename: Adrien
authors.initials: A
authors.lastname: Lefauve
authors.affiliation: Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.
authors.forename: David
authors.initials: D
authors.lastname: Saintillan
mesh_terms: D003102:Colloids / Q000737:chemistry*; D003198:Computer Simulation; D017276:Friction; D057446:Hydrodynamics; D008956:Models, Chemical; D010316:Particle Size; D012212:Rheology / Q000379:methods*; D033081:Shear Strength; D012996:Solutions / Q000737:chemistry*; D013314:Stress, Mechanical
chemical_list: D003102:Colloids; D012996:Solutions