Adaptive shape control for microswimmer navigation in turbulence
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arXiv
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866908873354379264 |
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| author | Qiu, Jingran Piro, Lorenzo Biferale, Luca Cencini, Massimo Mehlig, Bernhard Gustavsson, Kristian |
| author_facet | Qiu, Jingran Piro, Lorenzo Biferale, Luca Cencini, Massimo Mehlig, Bernhard Gustavsson, Kristian |
| contents | Navigation in turbulent environments is a fundamental challenge for biological and artificial microswimmers. While most existing studies focus on adapting motility or steering, the role of active morphological changes in navigation remains poorly explored. Here, we investigate a shape-changing spheroidal microswimmer tasked with maximising its displacement from an initial position in two-dimensional stochastic and turbulent flows. Using reinforcement learning (RL), the microswimmer learns to adapt its aspect ratio based on its orientation and local velocity-gradient signals. The learned strategies outperform fixed-shape and short-time-optimal baselines across different flow regimes and remain effective when transferred from stochastic flows to fully resolved turbulence. Guided by the learned policies, we propose a minimal analytical model that captures the essential navigation mechanisms and reproduces the performance across flow regimes. These results show that adaptive morphology provides a robust and physically interpretable control paradigm for microswimmer navigation in complex flows. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_08201 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Adaptive shape control for microswimmer navigation in turbulence Qiu, Jingran Piro, Lorenzo Biferale, Luca Cencini, Massimo Mehlig, Bernhard Gustavsson, Kristian Fluid Dynamics Soft Condensed Matter Biological Physics Navigation in turbulent environments is a fundamental challenge for biological and artificial microswimmers. While most existing studies focus on adapting motility or steering, the role of active morphological changes in navigation remains poorly explored. Here, we investigate a shape-changing spheroidal microswimmer tasked with maximising its displacement from an initial position in two-dimensional stochastic and turbulent flows. Using reinforcement learning (RL), the microswimmer learns to adapt its aspect ratio based on its orientation and local velocity-gradient signals. The learned strategies outperform fixed-shape and short-time-optimal baselines across different flow regimes and remain effective when transferred from stochastic flows to fully resolved turbulence. Guided by the learned policies, we propose a minimal analytical model that captures the essential navigation mechanisms and reproduces the performance across flow regimes. These results show that adaptive morphology provides a robust and physically interpretable control paradigm for microswimmer navigation in complex flows. |
| title | Adaptive shape control for microswimmer navigation in turbulence |
| topic | Fluid Dynamics Soft Condensed Matter Biological Physics |
| url | https://arxiv.org/abs/2603.08201 |