Chapitre D'ouvrage Année : 2024

Comparison of Near-Body Flow Fields of a Gudgeon and NACA0013 Profile

Résumé

Hydrodynamic sensing using the lateral line system allows fish to detect, localize and classify minute flow field fluctuations filtered through the boundary layer. These near-body flow fields provide valuable information about the current state of the flow environment during a swimming gait cycle and at rest. Previously, fish-like sensors have been developed for ecological studies using a simplified NACA0013 axisymmetric streamlined profile, which is a considerable simplification compared to the geometry of fish. To investigate potential differences in the near-body flow field resulting from the differences in body geometry, a comparison of the flow fields around a NACA0013 profile and a digital model of a bottom-dwelling gudgeon (Gobio gobio) fish (length = 15 cm) was performed. The time-averaged velocity fields around a gudgeon body and NACA0013 profile were obtained numerically using the open-source tool OpenFOAM at 0.25 and 0.55 ms−1. The results show that the streamwise velocity distribution in the lateral direction around the gudgeon body has minor deviations from those observed around the NACA profile. Specifically, near the surface of the fish-shaped body and NACA, a well-developed boundary layer was observed, with turbulent behavior in the posterior region near the tail fin. The results of this study indicate that the use of the NACA profile for boundary layer studies in ecologically relevant flows would be a suitable approximation of the gudgeon.

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Dates et versions

hal-04642598 , version 1 (09-07-2024)

Identifiants

Citer

Ali Hassan Khan, Gert Toming, Stefan Hoerner, Jeffrey A. Tuhtan. Comparison of Near-Body Flow Fields of a Gudgeon and NACA0013 Profile. Kalinowska, M.B.; Mrokowska, M.M.; Rowinski, P.M. Advances in Hydraulic Research, GeoPlanet, ISH 2023, Earth and Planetary Sciences, Springer Nature Switzerland, pp.231-242, 2024, GeoPlanet: Earth and Planetary Sciences, 978-3-031-56092-7. ⟨10.1007/978-3-031-56093-4_18⟩. ⟨hal-04642598⟩
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