Nonlinear dynamics and rheology of active fluids: Simulations in two dimensions
Nonlinear dynamics and rheology of active fluids: Simulations in two dimensions
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DOI：
10.1103/physreve.83.041910
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发表时间：
2011-04-13
影响因子：
2.4
通讯作者：
Cates, M. E.
中科院分区：
文献类型：
--
作者：
Fielding, S. M.;Marenduzzo, D.;Cates, M. E.
我们报告模拟连续模型（非极性，流动对齐）在两个维度的活性流体。自由和锚固边界条件被认为是在平行的约束墙，无论是静态的或以固定的相对速度移动。我们专注于可伸展的材料，并发现稳定的剪切带，以前所示的出现无处不在的在一个维度上的活动的双相在小（或甚至零）的剪切速率，通常被替换在两个维度上的更复杂的流动模式，可以是固定的，振荡的，或显然是混乱的。这些流型的时间平均稳态流变学的后果进行检查。
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.