Assessment Brief: MNE4005-B – Marine Hydrodynamics
Module: MNE4005 Marine Hydrodynamics and Propulsion
Assessment Title: Assessment 1: Critical Technical Report on Cavitation Performance of Marine Propellers
Weighting: 50%
Submission Date: 27th January 2025
Word Count: 3500 words (±10%)
Learning Outcomes:
Upon successful completion, you will be able to:
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Diagnose the fundamental physical mechanisms of cavitation inception and development on marine propellers.
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Critically evaluate the interplay between propeller geometry, operational profile, and cavitation-induced performance losses.
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Synthesise numerical and experimental data to propose a propeller design modification for cavitation mitigation.
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Task:
Produce a technical report analysing the cavitation performance of a marine propeller. Your report must contain a critical evaluation, not merely a descriptive summary. The structure must include:
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A systematic explanation of cavitation dynamics relevant to a specific vessel type (e.g., container ship, naval vessel, tug).
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A critical analysis of how at least two propeller geometric parameters (e.g., skew, pitch distribution, blade area ratio) influence cavitation inception and type (e.g., tip vortex, sheet, cloud).
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An evaluation of the consequences of the identified cavitation types, focusing on two of the following: erosion damage, pressure pulse-induced vibration, noise emission, or thrust breakdown.
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A justified recommendation for a design alteration or an operational mitigation strategy to suppress the dominant cavitation type analysed.
Referencing:
Use the Harvard referencing system. Incorporate a minimum of 12 credible sources, with a majority from peer-reviewed journals published within the last six years.
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Suggested Peer-Reviewed References (2019-2024)
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Gaggero, S. (2020) ‘A RANS-based self-propulsion simulator for the optimisation of propeller blades’, Ships and Offshore Structures, 15(sup1), pp. S153-S165.
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Taskar, B. & Yum, K.K. (2021) ‘Effect of waves on cavitation and pressure pulses of a chemical tanker’, Applied Ocean Research, 117, 102951.
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Sun, S., Wang, C., Guo, C., Su, Y.M. & Liu, P. (2022) ‘Numerical analysis of the correlation between tip vortex cavitation and vortex dynamics around a flexible hydrofoil’, Physics of Fluids, 34(4), 047112.
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Gaggero, S. (2023) ‘Design of Kappel propellers with reduced tip vortex cavitation’, Ocean Engineering, 286, 115568.
Analysis and Mitigation of Cavitation in Marine Propellers: Impacts on Performance, Vibration, and Erosion.