Numerical Simulation of Cavitation in High-Speed Marine Propellers

Abstract

As the Energy Efficiency Design Index (EEDI) criteria become more stringent, enhancing propeller 
(PP) efficiency has become critical in advancing environmentally sustainable vessels. Cavitation (CV) 
unavoidably transpires, diminishing the hydrodynamic efficiency of the PP and eroding the blade (BD) surface, 
resulting in heightened fuel consumption. Mitigating CV is essential for vessels to comply with the EEDI 
standard. This study examines the PP's fatigue (FQ) life and hydrodynamic efficiency at various CV numbers 
and velocities. The correlation between PP FQ lifespan and propulsion effectiveness under CV circumstances is 
reviewed. The Schnerr-Sauer mathematical framework is used as the CV concept in the experiment. The 
nominal stress technique (S-N method) is employed to determine the FQ durability of BDs. The PP is the subject 
of the study. The hydrodynamic efficiency of the PP under varying CV numbers is analyzed using the finite 
volume approach. The pressure on the BD’s exterior and wall shearing stress throughout the cycle are 
computed and then included in the dynamical process to determine the stress and strain of the PP via the finite 
element approach. The FQ lifespan of the PP is then determined using the S-N curve of the BD's materials. The 
study's reliability is confirmed by comparing the CV leads with experimental data from the Ocean Engineers 
Research Center for the ship at an average speed of 16.8 knots, where the CV amount in the wake area is 3.6, 
demonstrating excellent consistency. The results underscore the substantial influence of CV on BDs’ longevity 
and vibrational dynamics.