Fish locomotion has attracted the attention of many scientists throughout the centuries and nowadays, with the increasing interest in the environmental issues, it has become an important subject. Thanks to the recent developments of computational fluid dynamics we are able to perform numerical simulations that allow us to explore different aspects of fish motion. With the aid of a 2D numerical model, the present study focuses on the role of the deformation amplitude and the tail beat frequency for three different types of kinematics and for two different Reynolds numbers. An estimation of the efficiency has also been attempted both through the EBT model and with the classical definition of efficiency, although the matter is complicated and needs further investigation. In conclusion, an analysis of the different types of wake formed behind a swimming fish is given.
Lo studio del moto dei pesci ha attirato l'attenzione di molti scienziati nel corso dei secoli e al giorno d'oggi, con l'interesse crescente verso le tematiche ambientali, questo argomento acquisisce un'importanza sempre maggiore. Grazie ai recenti sviluppi della fluidodinamica computazionale, è possibile realizzare modelli numerici che permettono di esplorare diversi aspetti relativi al moto dei pesci. Con l'aiuto di un modello numerico 2D, questo studio si concentra sul ruolo dell'ampiezza della deformazione e del battito della coda per tre diversi tipi di cinematica e per due diversi numeri di Reynolds. E' stato inoltre tentato il calcolo dell'efficienza, sia attraverso il modello EBT che attraverso una definizione classica di efficienza, sebbene la questione sia complicata e necessiti di ulteriori approfondimenti. In conclusione sono stati analizzati diversi tipi della scia che si forma al passaggio di un pesce.
Numerical simulation of a 2D swimming fish: analysis of the tail beat frequency's role
ROSA, EMMA
2021/2022
Abstract
Fish locomotion has attracted the attention of many scientists throughout the centuries and nowadays, with the increasing interest in the environmental issues, it has become an important subject. Thanks to the recent developments of computational fluid dynamics we are able to perform numerical simulations that allow us to explore different aspects of fish motion. With the aid of a 2D numerical model, the present study focuses on the role of the deformation amplitude and the tail beat frequency for three different types of kinematics and for two different Reynolds numbers. An estimation of the efficiency has also been attempted both through the EBT model and with the classical definition of efficiency, although the matter is complicated and needs further investigation. In conclusion, an analysis of the different types of wake formed behind a swimming fish is given.File | Dimensione | Formato | |
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https://hdl.handle.net/20.500.12608/10176