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Application of large eddy simulation to predict underwater noise of marine propulsors. Part 2: Noise generation
Citation Link: https://doi.org/10.15480/882.3776
Publikationstyp
Journal Article
Date Issued
2021-07
Sprache
English
Institut
TORE-DOI
Volume
9
Issue
7
Article Number
778
Citation
Journal of marine science and engineering 9 (7) : 778 (2021-07)
Publisher DOI
Scopus ID
Publisher
MDPI
Methods to predict underwater acoustics are gaining increased significance, as the propulsion industry is required to confirm noise spectrum limits, for instance in compliance with classification society rules. Propeller-ship interaction is a main contributing factor to the underwater noise emissions by a vessel, demanding improved methods for both hydrodynamic and high-quality noise prediction. Implicit large eddy simulation applying volume-of-fluid phase modeling with the Schnerr-Sauer cavitation model is confirmed to be a capable tool for propeller cavitation simulation in part 1. In this part, the near field sound pressure of the hydrodynamic solution of the finite volume
method is examined. The sound level spectra for free-running propeller test cases and pressure pulses on the hull for propellers under behind ship conditions are compared with the experimental measurements. For a propeller-free running case with priory mesh refinement in regions of high vorticity to improve the tip vortex cavity representation, good agreement is reached with respect to the spectral signature. For behind ship cases without additional refinements, partial agreement was achieved for the incompressible hull pressure fluctuations. Thus, meshing strategies require improvements for this approach to be widely applicable in an industrial environment, especially for non-uniform propeller inflow.
method is examined. The sound level spectra for free-running propeller test cases and pressure pulses on the hull for propellers under behind ship conditions are compared with the experimental measurements. For a propeller-free running case with priory mesh refinement in regions of high vorticity to improve the tip vortex cavity representation, good agreement is reached with respect to the spectral signature. For behind ship cases without additional refinements, partial agreement was achieved for the incompressible hull pressure fluctuations. Thus, meshing strategies require improvements for this approach to be widely applicable in an industrial environment, especially for non-uniform propeller inflow.
Subjects
underwater radiated noise
propeller cavitation
implicit LES
Scale resolved turbulence
cavitating tip vortex
DDC Class
600: Technik
620: Ingenieurwissenschaften
Funding Organisations
More Funding Information
This research was funded by the European Union’s Horizon 2020 research and innovation programme under grant agreement No. 728053-MarTERA, represented by BMWI in Germany, grant number 03SX461C as part of the ProNoVi joint research project.
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