Charalambous, N; Eames, I; (2019) A computational analysis of a marine propeller with tubercle and its contribution in reducing sheet cavitation. In: Felli, Mario and Leotardi, Cecilia, (eds.) Proceedings of the Sixth International Symposium on Marine Propulsors (SMP'19). National Research Council of Italy, Institute of Marine Engineering (CNR-INM): Rome, Italy.

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Abstract

The paper examines the influence of wavy leading edges (tubercles) for a modified propeller in relation to the cavitation formation. Cavitation is the main source for the radiation of underwater noise. The leading edge of the marine propeller DTMB 4119 has been modified using OpenProp and compared with the DTMB 4119 propeller under the same operational conditions and the same cavitation number. The computational studies have been performed using a RANS solver with a multiphase mixture flow model applying the Schnerr-Sauer cavitation model in order to resolve the cavitation structures in the propeller. The results showed that the influence of the tubercles to the cavitation inception and formation can contribute to controlling the generation of sheet cavitation to the propeller surface and the opposite sign vorticity generated downstream of the propeller can locally influence the flow passing the surface of the propeller resulting to a modified flow environment that can interact with the mechanism responsible to the formation of sheet cavitation.

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