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Titre : | Influence de la géométrie du nid du Torquigener albomaculosus (poisson-globe) sur la circulation du courant marin. : Biomimétisme : design d'application sur les brise-lames. |
Auteurs : | Justine MICHEL ; Manon ARNAUD |
Type de document : | Mémoire d'initiation à la recherche |
Année de publication : | 2021 |
Concepts : |
EROSION
COURANT MARIN |
Résumé : | In 1995, circular shapes dug in the sand were spotted near the Ryukyu Islands in Japan. In 2013, it was discovered that they correspond to the nest of a fish named Torquigener Albomaculosus. He builds it in order to attract a female and to get a chance to reproduce with her. The nest of the Torquigener albomaculosus measures about two meters in diameter and has two distinct parts. The outer part has a pattern of dunes and valleys that are repeated between 24 and 32 times. The inner part is a heap of sand resulting from the creation of these dunes where the female will come to deposit her eggs. To test the behavior of sea currents inside the nest, a 3D model of the nest's shape was created on Catia, a software of the 3DEXPERIENCE platform. It was then used in the XFlow software, which is based on Lattice Boltzmann's mathematical resolution method. This method permits to model a fluid flows by considering turbulences. After simulating a fixed current, a current with two velocity components and then currents with different degrees of inclination (ranging from 20° to 70°), a slowing down of the current with a maximum of 78% was highlighted from the outside to the inside of the nest. As these numerical simulations have shown us a strong slowing down of the current due to the nest's structure, it is planned to test our results in a basin in order to obtain analogical results. It would also be interesting to try to optimize the slowing down by playing on with the geometry of the nest and to consider the erosion of the dunes. The goal would be to use the characteristics of this nest to create, for example, optimized wave breakers to protect coastlines from erosion. |
Spécialité : | Géologie |
Numéro de promo : | 83 |
numéro MIR : | 896 |