Numerical investigation of tip-vortex cavitation noise of submarine propellers using hybrid computational hydro-acoustic approach

Computational prediction of underwater radiated noise of cavitating marine propellers: On the accuracy of semi-empirical models

“…Depending on how various turbulence length scales are modelled or resolved, applied CFD methods can be classified as (Li et al, 2018): RANS or Unsteady RANS if the flow is treated as unsteady (Sezen et al, 2021c,b,a;Lee et al, 2021;Ge et al, 2020;Yao et al, 2021;Melissaris et al, 2020;Wu et al, 2018;Peters et al, 2018;Huang et al, 2019b;Lidtke et al, 2019); Detached Eddy Simulations (DES) (Ku et al, 2021;Usta and Korkut, 2019;Long et al, 2021;Yilmaz et al, 2020;Sezen et al, 2021a;Sakamoto and Kamiirisa, 2018); and Large Eddy Simulations (LES) (Hu et al, 2019;Long et al, 2020;Hu et al, 2021;Asnaghi et al, 2020;Long et al, 2019;Asnaghi et al, 2018). The form of acoustic analogy mostly employed for the prediction of noise from moving bodies is based on the solution of the Ffowcs William-Hawkings (FWH) acoustic analogy formulation (Ffowcs Willams, 1969), which has proven to be an effective and reliable numerical tool for sound radiation problems dominated by fluid/body interactions (Brentner and Farassat, 2003;Farassat and Brentner, 1988).…”

Investigation of cavitation noise using Eulerian-Lagrangian multiscale modeling

“…To investigate unsteady cavitation around a NACA0015 hydrofoil and its associated noise, Yu et al [20] combined a filter-based turbulence model with the Zwart-Gerbera-Belamri (ZGB) cavitation model. To predict hydrodynamic noise, caused by tip-vortex cavitation (TVC) of submarine propellers, Ku et al [21] employed delayed detached eddy simulation (DDES) with adaptive mesh refinement and the FW-H equation, and concluded that a higher pitch angle resulted in more noise. It has been reported by Testa [22] that an improved hydroacoustic formulation based on the standard FW-H equation can accurately predict noise magnitude and direction based on the emitted noise and sheet cavitation dynamics.…”

Manipulation of bubble collapse patterns near the wall of an adherent gas layer

“…When the local pressure underwater is less than the vapor pressure, bubbles spill out of the water and cavitation occurs [2] , [3] , [4] , [5] . According to the generalized Bernoulli principle (where the flow velocity is high, the pressure is low), in engineering practice, this phenomenon mostly occurs in areas where water flows at a high speed, such as underwater propellers [6] , [7] , ship rudders [8] , water pumps [9] , [10] , valves [11] , [12] , right-angle pipes [13] , etc. Cavitation bubbles underwater undergo the process of bubble generation, expansion, contraction, collapse, and rebound [14] .…”