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arXiv · 2512.09491

Emergence of edge state in suspension of self-propelled particles

Yoshiki Hiruta·Kenta Ishimoto
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Abstract

We numerically study a model convection system of a suspension of self-propelled particles, motivated by recent experimental findings of localized and bistable bioconvection pattern, being distinct from classical Rayleigh--B\'{e}nard convection. Linear stability analysis of the model system reveals that the trivial noncovection state is stabilized by an increase of self-propelled speed in the vertical direction. Through numerical simulations, we found a nonlinear convection state even when the nonconvection state is stable. Applying ideas and tools developed in wall-bounded flows, we numerically identified an edge state, which is an unstable solution on a basin boundary in the model dynamical systems.

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Yoshiki Hiruta, Kenta Ishimoto. 2025-12-10. Emergence of edge state in suspension of self-propelled particles. https://arxiv.org/abs/2512.09491

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