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EnglishIn this thesis some fluid-structure interaction problems related to swimming are investigated. The broad domain in which the cases can be classified is that of swimming at low-Reynolds numbers, that is in conditions close to the Stokes flow. In the first part, a simpler flow configuration is considered together with an active structure, to identify possible swimming strategies arising from deformations of a multi-stable shell. After a first analysis, based on numerical simulations, an asymptotic approach is employed aiming to confirm the results analytically. In the second part a more complex flow model is considered, in order to analyze a case where the Reynolds number is small but possibly finite. The case considered is that of a robotic swimmer in a viscous fluid, inspired by a celebrated paper of Purcell which is revisited here with more modern tools, from numerical techniques to experiments. Numerical solvers are developed to simulate the related flows: particular care is devoted to the scalability and efficiency of numerical methods in order to solve the Navier-Stokes equations within acceptable time constraints. The validity and accuracy of common models for micro swimmers are assessed by comparison of numerical results with experimental results.
Fluid-structure interaction problems involving thin active shells and microswimmers / Corsi, Giovanni. - (2020 Sep 24).
| Autori: | |
| Autori: | Corsi, Giovanni |
| Titolo: | Fluid-structure interaction problems involving thin active shells and microswimmers |
| Relatore/i interni: | |
| Data di pubblicazione: | 24-set-2020 |
| Appare nelle tipologie: | 8.1 PhD thesis |
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