论文标题

奇异的液体中主动力偶极子的成对动力学

Pair dynamics of active force dipoles in an odd-viscous fluid

论文作者

Hosaka, Yuto, Andelman, David, Komura, Shigeyuki

论文摘要

我们讨论了两个有源力偶极子的横向动力学,它们通过活性和手性的薄流体层中的流体动力相互作用相互相互作用。将流体层建模为具有奇异粘度的二维(2D)可压缩流体,而力偶极子(代表活性蛋白或酶)诱导偶极流动。考虑到2D流体中的动量衰减,我们通过分析获得取决于奇数粘度的迁移率张量,并包括非偏置流体动力相互作用。我们发现,由于奇数粘度引起的横向流动,粒子对显示出螺旋行为。与剪切粘度相比,奇数粘度的大小很大时,可以看到两种类型的振荡行为。其中一个可以理解为是由动态系统中的闭合轨道引起的,其圆形轨迹取决于奇数粘度和力偶极子之间的大小之间的比率。另外,从数值获得粒子偶极角的相图。我们的发现表明,非偏置响应导致嵌入具有奇特粘度的活性液中的活性颗粒的复杂动力学。

We discuss the lateral dynamics of two active force dipoles, which interact with each other via hydrodynamic interactions in a thin fluid layer that is active and chiral. The fluid layer is modeled as a two-dimensional (2D) compressible fluid with an odd viscosity, while the force dipole (representing an active protein or enzyme) induces a dipolar flow. Taking into account the momentum decay in the 2D fluid, we obtain analytically the mobility tensor that depends on the odd viscosity and includes nonreciprocal hydrodynamic interactions. We find that the particle pair shows spiral behavior due to the transverse flow induced by the odd viscosity. When the magnitude of the odd viscosity is large as compared with the shear viscosity, two types of oscillatory behaviors are seen. One of them can be understood as arising from closed orbits in dynamical systems, and its circular trajectories are determined by the ratio between the magnitude of the odd viscosity and the force dipole. In addition, the phase diagrams of the particle dipolar angles are obtained numerically. Our findings reveal that the nonreciprocal response leads to complex dynamics of active particles embedded in an active fluid with odd viscosity.

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