TY - JOUR
T1 - Nonlinear dynamics and rheology of active fluids: Simulations in two dimensions
AU - Fielding, S. M.
AU - Marenduzzo, D.
AU - Cates, M. E.
PY - 2011/4/13
Y1 - 2011/4/13
N2 - We report simulations of a continuum model for (apolar, flow aligning) active fluids in two dimensions. Both free and anchored boundary conditions are considered, at parallel confining walls that are either static or moving at fixed relative velocity. We focus on extensile materials and find that steady shear bands, previously shown to arise ubiquitously in one dimension for the active nematic phase at small (or indeed zero) shear rate, are generally replaced in two dimensions by more complex flow patterns that can be stationary, oscillatory, or apparently chaotic. The consequences of these flow patterns for time-averaged steady-state rheology are examined.
AB - We report simulations of a continuum model for (apolar, flow aligning) active fluids in two dimensions. Both free and anchored boundary conditions are considered, at parallel confining walls that are either static or moving at fixed relative velocity. We focus on extensile materials and find that steady shear bands, previously shown to arise ubiquitously in one dimension for the active nematic phase at small (or indeed zero) shear rate, are generally replaced in two dimensions by more complex flow patterns that can be stationary, oscillatory, or apparently chaotic. The consequences of these flow patterns for time-averaged steady-state rheology are examined.
KW - SHEAR-FLOW
KW - HYDRODYNAMICS
KW - TRANSITION
UR - http://www.scopus.com/inward/record.url?scp=79961085457&partnerID=8YFLogxK
U2 - 10.1103/PhysRevE.83.041910
DO - 10.1103/PhysRevE.83.041910
M3 - Article
VL - 83
SP - -
JO - Physical Review E - Statistical, Nonlinear and Soft Matter Physics
T2 - Physical Review E - Statistical, Nonlinear and Soft Matter Physics
JF - Physical Review E - Statistical, Nonlinear and Soft Matter Physics
SN - 1539-3755
IS - 4
M1 - 041910
ER -