Inertial rotation of a small oblate spheroid in a simple shear flow
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866912753380229120 |
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| author | Wang, Ziqi de Wit, Xander M. Di Giusto, Davide Bergougnoux, Laurence Guazzelli, Elisabeth Marchioli, Cristian Mehlig, Bernhard Toschi, Federico |
| author_facet | Wang, Ziqi de Wit, Xander M. Di Giusto, Davide Bergougnoux, Laurence Guazzelli, Elisabeth Marchioli, Cristian Mehlig, Bernhard Toschi, Federico |
| contents | We compare experiments and fully-resolved particle simulations designed to match the experimental conditions of a weakly inertial, neutrally buoyant, moderately oblate spheroid in shear flow under confinement. Experimental and numerical results are benchmarked against theory valid for asymptotically small particle Reynolds numbers and for unconfined systems. By considering the combined effects of confinement and inertia, sensitivity to initial conditions, and the time span of observation, we reconcile the findings of theory, experiments, and numerical simulations. Furthermore, we demonstrate that confinement significantly influences the orientational stability of log-rolling spheroids compared to weak inertia, with the primary consequence being a reduced drift rate towards the stable log-rolling orbit. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2512_06822 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Inertial rotation of a small oblate spheroid in a simple shear flow Wang, Ziqi de Wit, Xander M. Di Giusto, Davide Bergougnoux, Laurence Guazzelli, Elisabeth Marchioli, Cristian Mehlig, Bernhard Toschi, Federico Fluid Dynamics Applied Physics Computational Physics We compare experiments and fully-resolved particle simulations designed to match the experimental conditions of a weakly inertial, neutrally buoyant, moderately oblate spheroid in shear flow under confinement. Experimental and numerical results are benchmarked against theory valid for asymptotically small particle Reynolds numbers and for unconfined systems. By considering the combined effects of confinement and inertia, sensitivity to initial conditions, and the time span of observation, we reconcile the findings of theory, experiments, and numerical simulations. Furthermore, we demonstrate that confinement significantly influences the orientational stability of log-rolling spheroids compared to weak inertia, with the primary consequence being a reduced drift rate towards the stable log-rolling orbit. |
| title | Inertial rotation of a small oblate spheroid in a simple shear flow |
| topic | Fluid Dynamics Applied Physics Computational Physics |
| url | https://arxiv.org/abs/2512.06822 |