Marine propeller underwater radiated noise prediction with the FWH acoustic analogy Part 2: Assessment of model scale propeller hydroacoustic performance under non-uniform flow conditions

Sezen, Savaş; Atlar, Mehmet

doi:10.1016/j.oceaneng.2022.113443

Cited by 15 publications

(3 citation statements)

References 26 publications

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“…While the DDES method has shown improvements in predicting mid-frequency noise, accurately forecasting high-frequency noise remains challenging. Sezen et al [16] proposed that the absence of cavitation bubble dynamics in CFD calculations of propeller cavitation is the main reason for the discrepancy between the URN of CFD predictions and full scale observations. Zhang et al [17] found that noise predictions from both LES-FW-H hybrid methods and LES with Powell vortex sound theory were comparable, demonstrating the potential of numerical models in accurately simulating cavitation noise from resolvable structures.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of the acoustic spectrum of bubble clusters

Deng,

Zhao,

Zhang

et al. 2024

Preprint

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This study delved into the acoustic spectrum of bubble clusters, each consisting of 352 vapor bubbles across volume fractions ranging from 0.005–40%. The clusters, organized in five distinct layers, were modeled using the Volume of Fluid (VOF) method to capture the bubble interfaces, and the Ffowcs Williams-Hawkings (FW-H) methodology to compute the far-field acoustic pressure from bubble collapse. Further analysis revealed distinct sound pressure behaviors across different volume fractions: For 25%-40%, time-domain analysis shows that the peak acoustic pressure pulses from the two innermost layers of bubbles are significantly higher than those from the outer layers. In the frequency domain, the octave decay rate of the acoustic pressure levels is relatively low, around − 3dB/octave. For 0.5%-25%, four acoustic pressure pulses with similar widths and peak values were observed in the time domain. In the frequency domain, there are three distinct peaks in sound pressure levels(SPL), directly linked to the difference in collapse times of bubbles within the cluster, and the octave decay rate accelerates as the volume fraction decreases, stabilizing at -6dB/octave when the volume fraction is reduced to 17.5%. For 0.005%-0.5%, as the volume fraction decreases from 0.5–0.1%, the number of acoustic pressure pulses significantly reduces. Below 0.1% volume fraction, only a single wider pulse is observed. In the frequency domain, the octave decay rate gradually increases with decreasing volume fraction, significantly exceeding − 10dB/octave when it drops below 0.1%, reaching up to -11.7dB/octave.

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Section: Introductionmentioning

confidence: 99%

Numerical study of the acoustic spectrum of bubble clusters

Deng,

Zhao,

Zhang

et al. 2024

Preprint

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“…Both underwater tunnel blasting and conventional tunnel blasting produce vibration, but the vibration they produce is different in the following points [12][13][14][15]. (1) Propagation medium: the vibration of underwater tunnel blasting is propagated through water, while the vibration of conventional tunnel blasting is propagated through soil or rock.…”

Section: Introductionmentioning

confidence: 99%

Mathematical simulation modeling analysis of sub-sea tunnel blasting based on grey correlation

Ling,

Ding,

2024

J. vibroeng.

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Blasting in the ocean tunnel has a great impact on Marine life and seabed vegetation, so it is necessary to control the impact of blasting vibration on the surrounding Marine environment. In this paper, taking Xiamen Tunnel as an example, the blasting vibration response characteristics of undersea tunnel are studied, and the velocity attenuation rules of tunnel structure in different directions are obtained. The grey correlation theory is innovatively applied to analyze the correlation degree of factors affecting the blasting vibration effect of the undersea tunnel, and the key factors and secondary factors affecting the blasting vibration effect of the tunnel are determined. The grey correlation theory is used to analyze the correlation degree between the blasting vibration effect of the cross-tunnel, which is conducive to improving the safety and stability of tunnel construction. It provides a new idea and method for vibration control of similar projects.

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“…Generally, these representations are investigated in two groups: non-discretized propeller approaches and discretized propeller approaches. The former includes actuator disc models (Đurasević et al, 2022;Jasak et al, 2019;Villa et al, 2019) and body force models based on Blade Element Momentum Theory (BEMT) (Feng et al, 2020), while the latter covers Moving Reference Frame (MRF) (Sezen et al, 2021), sliding mesh (Kinaci et al, 2018;Sezen and Atlar, 2023;Wang et al, 2021), and overset mesh (Đurasević et al, 2022) techniques. For example, within the scope of non-discretized propeller approaches, Sezen et al (2018) modeled the propeller as an actuator disc based on the body force method coupled with the experimental open water data.…”

Section: Introductionmentioning

confidence: 99%

Powering Performance Prediction of a Semi-Displacement Ship Retrofitted with Hull Vane

Çelik,

Danışman

2023

Preprint

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Marine propeller underwater radiated noise prediction with the FWH acoustic analogy Part 2: Assessment of model scale propeller hydroacoustic performance under non-uniform flow conditions

Cited by 15 publications

References 26 publications

Numerical study of the acoustic spectrum of bubble clusters

Numerical study of the acoustic spectrum of bubble clusters

Mathematical simulation modeling analysis of sub-sea tunnel blasting based on grey correlation

Powering Performance Prediction of a Semi-Displacement Ship Retrofitted with Hull Vane

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