Ocean Engineering, Год журнала: 2024, Номер 314, С. 119693 - 119693
Опубликована: Ноя. 8, 2024
Язык: Английский
Ocean Engineering, Год журнала: 2024, Номер 314, С. 119693 - 119693
Опубликована: Ноя. 8, 2024
Язык: Английский
Physics of Fluids, Год журнала: 2025, Номер 37(1)
Опубликована: Янв. 1, 2025
Reduced-order analysis is employed to comprehend and elucidate the dominant spatiotemporal turbulent structures that play a pivotal role in evolution of propeller wake dynamics. The vortices encompasses cyclical process from stability instability as well multiscale progression coherence disintegration. Consequently, this paper utilizes proper orthogonal decomposition (mPOD) model investigate dynamic characteristics under various conditions simulated via delayed detached-eddy simulation method. findings are then compared with data obtained through (POD). comparison results experimental data, along grid convergence study, confirms reliability numerical outputs used inputs for modal analysis. indicate frequency components associated flow modes mPOD relatively singular, which facilitates better explanation phenomena elucidates underlying mechanisms. encompass contributing at different scales during wake. In addition, destabilization mechanisms wakes loading also elaborated based on reduced-order
Язык: Английский
Процитировано
1Ocean Engineering, Год журнала: 2025, Номер 324, С. 120745 - 120745
Опубликована: Фев. 26, 2025
Язык: Английский
Процитировано
0Physics of Fluids, Год журнала: 2025, Номер 37(3)
Опубликована: Март 1, 2025
This study implements high-fidelity modeling to analyze the hydrodynamic and hydroacoustic characteristics of bio-inspired marine vessel rudders, modeled after fins a humpback whale. The focus is on tubercled leading-edge rudders (TLER), with an amplitude 5% wavelengths 25% 50% mean chord length, compared straight rudder. Simulations are performed at deflection angles α = 0°, 10°, 20° using large Eddy simulation turbulence model Schnerr–Sauer cavitation model, in conjunction volume fluid cavity tracker, combined Ffowcs Williams-Hawkings analogy within OpenFOAM framework. goal optimize propulsion system reduce radiated noise from propeller/rudder under conditions. examines impact flow dynamics parameters such as sound pressure level, thrust, acoustic spectrum levels, rudder force, separation/spanwise flow. Key focuses include formation, development, dissipation dominant wake morphologies—such spiral tip, root, hub, propeller, trailing edge vortices—and features, including sheet, tip along propeller surface, well surface cavitation. Interactions between these generation mechanisms, their identified frequency modes examined for various TLER designs maneuvering conditions improve efficiency. Phenomena, counter-rotating vortex pairs, low-pressure zones, separation, reattachment near TLER, short-wave instabilities, breakdown, pairing mutual inductance, progressive weakening, minor meandering, analyzed across low-, medium-, high-frequency ranges narrow-band broadband spectral characteristics.
Язык: Английский
Процитировано
0Ocean Engineering, Год журнала: 2024, Номер 306, С. 118064 - 118064
Опубликована: Май 14, 2024
Язык: Английский
Процитировано
3Ocean Engineering, Год журнала: 2024, Номер 312, С. 119150 - 119150
Опубликована: Сен. 5, 2024
Язык: Английский
Процитировано
1Ocean Engineering, Год журнала: 2024, Номер 318, С. 120073 - 120073
Опубликована: Дек. 21, 2024
Язык: Английский
Процитировано
1Ocean Engineering, Год журнала: 2024, Номер 314, С. 119693 - 119693
Опубликована: Ноя. 8, 2024
Язык: Английский
Процитировано
0