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

Yuto Hosaka, David Andelman, Shigeyuki Komura*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Abstract: 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. Graphic abstract: [Figure not available: see fulltext.]

Original languageEnglish
Article number18
JournalEuropean Physical Journal E
Issue number3
StatePublished - Mar 2023


FundersFunder number
Wenzhou Institute
National Natural Science Foundation of China12274098, 12250710127, 3396/19
Israel Science Foundation213/19
University of Chinese Academy of SciencesWIUCASQD2021041


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