Marine propeller noise propagation within bounded domains

Petris, Giovanni; Cianferra, Marta; Armenio, Vincenzo

doi:10.1016/j.oceaneng.2022.112618

Cited by 9 publications

(2 citation statements)

References 24 publications

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“…2021; Razaghian et al. 2021; Petris, Cianferra & Armenio 2022; Posa et al. 2022 b ) and affecting their interaction with downstream devices, such as rudders (Kinnas et al.…”

Section: Introductionmentioning

confidence: 99%

“…Marine propellers shed large structures, especially from the tip of their blades and from their hub, having an important impact on their acoustic signature (Bagheri et al 2017;Cianferra, Petronio & Armenio 2019;Wang, Göttsche & Abdel-Maksoud 2020;Ebrahimi et al 2021;Razaghian et al 2021;Petris, Cianferra & Armenio 2022;) and affecting their interaction with downstream devices, such as rudders (Kinnas et al 2007;Felli, Camussi & Guj 2009;Felli & Falchi 2011;Felli, Grizzi & Falchi 2014;Badoe, Phillips & Turnock 2015;He & Kinnas 2017;Villa et al 2018;Hu et al 2019bHu et al , 2021Wang et al 2019;Villa, Franceschi & Viviani 2020;Felli 2021;, 2022aZhang et al 2022). A number of studies dealing with the wake of marine propellers are currently available in the literature, including both physical experiments and numerical simulations.…”

Section: Introductionmentioning

confidence: 99%

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Anisotropy of turbulence at the core of the tip and hub vortices shed by a marine propeller

Posa

2023

J. Fluid Mech.

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Large-eddy simulation on a grid consisting of 5 billion points was utilized to study the properties of turbulence at the core of the tip and hub vortices shed by a marine propeller across working conditions. Turbulence at the core of the tip vortices was found to be initially isotropic, moving towards a ‘cigar-shaped’ axisymmetric state as instability grows, dominated by turbulent fluctuations of the velocity component directed in the radial direction of the cylindrical reference frame centred at the wake axis. The break-up of the coherence of the tip vortices is instead characterized by turbulence recovering an isotropic state. This process is accelerated by growing load conditions of the propeller. In contrast, during instability of the hub vortex, turbulence at its core develops a ‘pancake-shaped’ axisymmetric state, dominated by the fluctuations of the radial and azimuthal velocities. However, at higher propeller loads turbulence at the core of the hub vortex keeps close to isotropy, thanks to a faster instability. Within both tip and hub vortices the deviations from Boussinesq's hypothesis were found very significant, providing evidence of the unsuitability of conventional turbulence modelling. At the core of the tip vortices they become especially large at their break-up and for increasing load conditions of the propeller, equivalent to more intense structures. In contrast, at the core of the hub vortex they were verified to be decreasing functions of the propeller load.

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“…2021; Razaghian et al. 2021; Petris, Cianferra & Armenio 2022; Posa et al. 2022 b ) and affecting their interaction with downstream devices, such as rudders (Kinnas et al.…”

Section: Introductionmentioning

confidence: 99%