Numéro : 2761 - Year : 2021
Thrust breakdown numerical evaluation
Benoît COINTE, Laurence BRIANCON-MARJOLLET - DGA TH – Val-De-Reuil (France)
In this paper, the variations of thrust and torque on a marine propeller in cavitating conditions are studied numerically. The goal of the study is to improve the propeller design routine of DGA Hydrodynamics and to be able to compute with a good precision the Thrust Breakdown. To that extent, numerical computations are performed with Fluent software, with structured and unstructured grid made on ICEM and Fluent Meshing. In order to compute cavitation, a mixture model is used, with parameters calibrated with data issued from the GTH configurations, like the number and the size of the nuclei injected in the tunnel. The RANS turbulence model k-ω SST was first tested. The numerical values of Thrust and Torque are compared to the experimental data obtained in the GTH. The results of thrust and torque losses are compared to data obtained in the GTH for different configurations and with high speed camera. Results show a good comparison between numerical and experimental results for an open water test of the propeller, but a discrepancy can be observed for a propeller behind hull, probably due to a computation of the wake behind the hull not efficient enough.
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