Abstract
In this paper, we utilized numerical simulations to investigate single- and two-phase viscous flows around marine propellers in open-water conditions at different Reynolds number regimes. The simulations were carried out using a homogeneous two-phase flow model with RANS and hybrid RANS/LES turbulence modelling approaches. Transition was accounted for in the model-scale simulations by employing a transition model. Both steady and unsteady propeller cavitation were investigated.
We considered two types of marine propellers: a conventional and a tip-loaded one. We compared the results of the simulations to experiments in terms of global propeller performance and cavitation observations. The propeller global forces, cavitation, near-blade flow phenomena and the wake flow characteristics were investigated in model- and full-scale.
The model-scale propeller performance characteristics and the cavitation patterns were captured well with the numerical simulations. The simulated global propeller performance and the cavitation structures were mainly similar between the model- and full-scale conditions. We observed a tendency of increased cavitation extent as the Reynolds number increased, both in steady and unsteady cases. At the same time, greater dissipation of vortex cavitation and unsteady cavitation structures was noted in the full-scale conditions.
We considered two types of marine propellers: a conventional and a tip-loaded one. We compared the results of the simulations to experiments in terms of global propeller performance and cavitation observations. The propeller global forces, cavitation, near-blade flow phenomena and the wake flow characteristics were investigated in model- and full-scale.
The model-scale propeller performance characteristics and the cavitation patterns were captured well with the numerical simulations. The simulated global propeller performance and the cavitation structures were mainly similar between the model- and full-scale conditions. We observed a tendency of increased cavitation extent as the Reynolds number increased, both in steady and unsteady cases. At the same time, greater dissipation of vortex cavitation and unsteady cavitation structures was noted in the full-scale conditions.
| Original language | English |
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| Number of pages | 14 |
| Publication status | Published - Nov 2019 |
| MoE publication type | Not Eligible |
| Event | AVT-307 Research Symposium, Separated Flow: Prediction, Measurement and Assessment for Air and Sea Vehicles - Trondheim, Norway Duration: 7 Oct 2019 → 9 Oct 2019 |
Conference
| Conference | AVT-307 Research Symposium, Separated Flow |
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| Country/Territory | Norway |
| City | Trondheim |
| Period | 7/10/19 → 9/10/19 |