| The propeller is the most commonly used modern ship propulsion unit, so its performance ofhydrodynamics is extremely important for ship. How to design a propeller with high propulsionefficiency, no cavitation or low noise pressure level is still a problem of great concern.In this paper, the development of propeller design and performance prediction methods wasreviewed. Also the methods of MRF and dynamic mesh usual used for solving the Reynolds AverageNavier-Stokes Equations (RANSE) in the flow field with propeller rotational movements wereanalyzed in this paper. The fundamental theory of numerical prediction of propeller performance in thispaper is turbulence model, cavitation model and noise model. They were all introduced at first.The uncertainly analysis of numerical simulation was performed according to ITTC standard inthe prediction of DTMB4119propeller hydrodynamics. For the purpose of method investigation, thenumerical simulation of open-water propeller performance at forward, back or crashback status wasmade in FLUENT software suits. The numerical results were of a great agreement with the modelexperimental results. The prediction of fluid dynamic interaction between propeller and the hull was avery important part of this paper. With a focus on fluctuating forces on the propeller, which may inducevibration, I computed the time history of forces and moments on different parts. The spectral analysisof the blade load time history showed the force had a strong peak at the blade frequency. From thedetailed analysis of the propeller sheet cavitation, we confirmed that the Zwart and Sauer cavitationmodels can accurate prediction the cavitation size, shape and location on the blade. In addition, wecould obtain the radiated noise through equations of FW-H. The field of noise was also reliable.Based on the results I obtained results with good agreement with model test results, and verifiedthe accuracy using the numerical simulation method. |
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