Boudenne, BastienBastienBoudenneDucoin, AntoineAntoineDucoin2024-04-152024-04-152024-04-048th International Symposium on Marine Propulsors (smp 2024)978-82-691120-5-4https://hdl.handle.net/11420/46448The boundary layer regime knowledge is a key factor in predicting the performance of lab-scale marine propellers. Even if the distribution of the boundary layer flow regime around the propeller blade is well-known by the marine propeller community, no dynamic of the turbulent process has already been reported in the literature. An Underresolved Direct Numerical Simulation (U-DNS) of a Cseries marine propeller blade at a Reynolds number of 600, 000 and an advance coefficient of 0.73 is performed to gain insights into the turbulent transition mechanisms of the boundary layer. An overset approach is used with the open-source spectral element code Nek5000 to optimize the computational cost of the simulation. After performing a mesh-sensitivity analysis, results are validated using experimental data. The detailed investigation of the boundary layer shows good agreement with the experimental and numerical data. New insights into the turbulent transition dynamics suggest that centrifugal instability plays a major role in the transition process. A map of the boundary layer flow regimes is then discussed. The laminar cross-flow vortices’ inception and breakdown are studied in detail to characterize the onset of longitudinal streaks.enhttp://rightsstatements.org/vocab/InC/1.0/Turbulent TransitionMarine PropellerDNSCFDEngineering and Applied OperationsConference Paper10.15480/882.931210.15480/882.931210.15480/882.9294Conference Paper