Investigation of Cavitation Noise in Cavitating Flows around an NACA0015 Hydrofoil

Abstract

To provide theoretical basis for cavitation noise control, the cavitation evolution around a hydrofoil and its induced noise were numerically investigated. A modified turbulence model and Zwart cavitation model were employed to calculate the flow field and predict the cavitation phenomenon accurately. Then, the acoustic analogy method based on the Ffowcs Williams-Hawking (FW-H) equation was applied to analyze the cavitation-induced noise. Seven cavitation numbers were selected for analysis. Acoustic power spectral density (PSD) and acoustic pressure were investigated to establish the relationship between cavitation number and their acoustic characteristics. It was indicated that as cavitation number decreases, cavitation cycle length gets shorter and the magnitude of acoustic power spectral density increases dramatically. One peak value of acoustic power spectral density induced by the extending and retracting of leading-edge cavitation can be obtained under sheet cavitation conditions, while under cloud cavitation, two peak values of acoustic power spectral density can be obtained and are induced by superposition from leading-edge cavitation and trailing vortex.

Numerical Simulation of Ventilated Cavitation Evolution with an Insight on How Ventilation Influences Pressure Fluctuation and Cavitation Noise

“…The previous investigations revealed the characteristics of natural cavitation induced noise around a NACA0015 hydrofoil (Yu et al 2019). It is confirmed that with the decreasing of cavitation number, the magnitude of acoustic power spectral density (PSD) increased significantly, which can be attributed to their difference in cavitation evolution.…”

Investigation of cavitation noise using Eulerian-Lagrangian multiscale modeling

“…Additionally, several studies have demonstrated that combining CFD and acoustic analogies based on the Williams and Hawkings (FW-H) equation is effective [19] . 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.…”

Effect of Tip Clearance Size on the Cavitation Flow and Noise Characteristics of the NACA0009 Hydrofoil

“…However, scholars mainly considered the accuracy of numerical calculation methods and the mechanism of TLV cavitation, while ignoring the interaction between tip clearance specifications and TLV cavitation and noise. In order to ensure the accuracy of noise prediction, scholars have taken into account the impact of turbulence models on prediction and analysis noise [7]. The research shows that the turbulence model harms the noise sources of single-stage and induced effects.…”