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Communication Dans Un Congrès Année : 2024

Direct Numerical Simulation of the Centrifugal Instability-induced Transition Around a Marine Propeller Blade

Résumé

The boundary layer regime knowledge is a key factor in predicting the performance of lab-scale marine propellers. If the distribution of the boundary layer flow regime around the propeller blade is known, no dynamic of the turbulent process has already been reported. An Under-resolved Direct Numerical Simulation (U-DNS) of a C-series 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.
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mercredi 18 décembre 2024
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Dates et versions

hal-04616250 , version 1 (18-06-2024)

Identifiants

  • HAL Id : hal-04616250 , version 1

Citer

Bastien Boudenne, Antoine Ducoin. Direct Numerical Simulation of the Centrifugal Instability-induced Transition Around a Marine Propeller Blade. 8th International Symposium on Marine Propulsors (smp 2024), Mar 2024, Berlin (Germany), Germany. ⟨hal-04616250⟩
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