Anomalous mobility of a driven active particle in a steady laminar flow

F. Cecconi; A. Puglisi; A. Sarracino; A. Vulpiani

doi:10.1088/1361-648x/aac4f0

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arXiv · 1805.04352

Anomalous mobility of a driven active particle in a steady laminar flow

F. Cecconi·A. Puglisi·A. Sarracino·A. Vulpiani

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Abstract

We study, via extensive numerical simulations, the force-velocity curve of an active particle advected by a steady laminar flow, in the nonlinear response regime. Our model for an active particle relies on a colored noise term that mimics its persistent motion over a time scale $\tau_A$. We find that the active particle dynamics shows non-trivial effects, such as negative differential and absolute mobility (NDM and ANM, respectively). We explore the space of the model parameters and compare the observed behaviors with those obtained for a passive particle ($\tau_A=0$) advected by the same laminar flow. Our results show that the phenomena of NDM and ANM are quite robust with respect to the details of the considered noise: in particular for finite $\tau_A$ a more complex force-velocity relation can be observed.

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F. Cecconi, A. Puglisi, A. Sarracino, A. Vulpiani. 2018-05-11. Anomalous mobility of a driven active particle in a steady laminar flow. https://doi.org/10.1088/1361-648x%2Faac4f0

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