Reciprocal swimming in viscoelastic granular hydrogels
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arXiv
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| Autores principales: | , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| Acceso en línea: | |
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| _version_ | 1866911628538150912 |
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| author | Xiao, Hongyi Wang, Jing Sack, Achim Stannarius, Ralf Pöschel, Thorsten |
| author_facet | Xiao, Hongyi Wang, Jing Sack, Achim Stannarius, Ralf Pöschel, Thorsten |
| contents | We experimentally study a scallop-like swimmer with reciprocally flapping wings in a nearly frictionless, cohesive granular medium consisting of hydrogel spheres. Significant locomotion is found when the swimmer's flapping frequency matches the inverse relaxation time of the material. Remarkably, the swimmer moves in the opposite direction compared to its motion in a cohesion-free granular material of hard plastic spheres. At higher or lower frequencies, we observe no motion of the swimmer, apart from a short initial transient phase. X-ray radiograms reveal that the wing motions create low-density zones, which in turn give rise to a hysteresis in drag and propulsion forces. This time-dependent effect, combined with the swimmer's inertia, accounts for locomotion at intermediate frequencies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_16586 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Reciprocal swimming in viscoelastic granular hydrogels Xiao, Hongyi Wang, Jing Sack, Achim Stannarius, Ralf Pöschel, Thorsten Soft Condensed Matter Fluid Dynamics We experimentally study a scallop-like swimmer with reciprocally flapping wings in a nearly frictionless, cohesive granular medium consisting of hydrogel spheres. Significant locomotion is found when the swimmer's flapping frequency matches the inverse relaxation time of the material. Remarkably, the swimmer moves in the opposite direction compared to its motion in a cohesion-free granular material of hard plastic spheres. At higher or lower frequencies, we observe no motion of the swimmer, apart from a short initial transient phase. X-ray radiograms reveal that the wing motions create low-density zones, which in turn give rise to a hysteresis in drag and propulsion forces. This time-dependent effect, combined with the swimmer's inertia, accounts for locomotion at intermediate frequencies. |
| title | Reciprocal swimming in viscoelastic granular hydrogels |
| topic | Soft Condensed Matter Fluid Dynamics |
| url | https://arxiv.org/abs/2510.16586 |