Using Large-Eddy Simulations to Investigate the Wake Evolution of Marine Propellers Operating in Coastal Environments and Inland Rivers

Zhou, J.; Long, L.; Miao, J.; Sun, P., and Jiang, Y., . Using large-eddy simulations to investigate the wake evolution of marine propellers operating in coastal environments and inland rivers.The highly complex turbulent flow structures of the propeller wake contain many evolution mechanisms that ha...

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Bibliographic Details
Published in:Journal of coastal research 2023-01
Main Authors: Zhou, Jiayu, Long, Liji, Miao, Jilun, Sun, Peng, Jiang, Youxiang
Format: Article
Language:English
Subjects:
Coastal environments
Coastal zones
Coherence
Evolution
Far fields
Flow structures
Fluid flow
Large eddy simulation
Near fields
Oceanic eddies
Propellers
Rivers
Sailing
Turbulence
Turbulent flow
Vortices
Wakes
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Summary:Zhou, J.; Long, L.; Miao, J.; Sun, P., and Jiang, Y., . Using large-eddy simulations to investigate the wake evolution of marine propellers operating in coastal environments and inland rivers.The highly complex turbulent flow structures of the propeller wake contain many evolution mechanisms that have not been revealed or thoroughly understood. The objective of the present work is to excavate the evolution characteristics and instability mechanisms of propeller wakes. The large-eddy simulation was used to investigate the details of the wake evolution of a four-bladed propeller. The entire evolution of the propeller wake field was resolved from the near field to the far field. The results showed that the tip vortex presents a more regular topological structure with strong coherence in the near field, where the large-scale vortex dominates the propeller wake and the turbulence intermittency is strong. The tip-vortex system breaks down into small-scale vortices in the midfield and rapidly loses coherence because of the further development of elliptic instability and the secondary vortex structures. The tip-vortex structures associated with physical quantities are completely discretized, and the small-scale turbulent structures are rapidly intermixed, which makes the wake system tend to be homogeneously distributed in the far field. The present study supports the development and improvement of the next-generation propellers operating behind vessels sailing in the inland river and coastal environments and zones farther out to sea.
ISSN:0749-0208
1551-5036
DOI:10.2112/JCOASTRES-D-22-00089.1