Feasibility study of RANS in predicting propeller cavitation in behind-hull conditions

• Autorzy: Zhang Yuxin , Wu Xiao-ping , Lai Ming-yan , Zhou Guo-ping , Zhang Jie

Identyfikatory

DOI

10.2478/pomr-2020-0063

• Języki publikacji: EN

Abstrakty

EN

The propeller cavitation not only affects the propulsive efficiency of a ship but also can cause vibration and noise. Accurate predictions of propeller cavitation are crucial at the design stage. This paper investigates the feasibility of the Reynolds-averaged Navier–Stokes (RANS) method in predicting propeller cavitation in behind-hull conditions, focusing on four aspects: (i) grid sensitivity; (ii) the time step effect; (iii) the turbulence model effect; and (iv) ability to rank two slightly different propellers. The Schnerr-Sauer model is adopted as the cavitation model. A model test is conducted to validate the numerical results. Good agreement on the cavitation pattern is obtained between the model test and computational fluid dynamics. Two propellers are computed, which have similar geometry but slightly different pitch ratios. The results show that RANS is capable of correctly differentiating the cavitation patterns between the two propellers in terms of the occurrence of face cavitation and the extent of sheet cavitation; moreover, time step size is found to slightly affect sheet cavitation and has a significant impact on the survival of the tip vortex cavitation. It is also observed that grid refinement is crucial for capturing tip vortex cavitation and the two-equation turbulence models used – realizable k-ε and shear stress transport (SST) k-ω – yield similar cavitation results.

Słowa kluczowe

EN

RANS; computational fluid dynamics CFD; propeller cavitation; turbulence model; grid sensitivity

• Wydawca: Gdańsk University of Technology, Faculty of Ocean Engineering & Ship Technology
• Czasopismo: Polish Maritime Research
• Rocznik: 2020
• Tom: nr 4
• Strony: 26--35
• Opis fizyczny: Bibliogr. 22 poz., rys., tab.

Twórcy

autor

Zhang Yuxin

• Shanghai Merchant Ship Design and Research Institute, 2633 Zu Chong Zhi Road, 201203 Shanghai, China

autor

Wu Xiao-ping

• Shanghai Merchant Ship Design and Research Institute, 2633 Zu Chong Zhi Road, 201203 Shanghai, China

autor

Lai Ming-yan

• Shanghai Merchant Ship Design and Research Institute, 2633 Zu Chong Zhi Road, 201203 Shanghai, China

autor

Zhou Guo-ping

• Shanghai Merchant Ship Design and Research Institute, 2633 Zu Chong Zhi Road, 201203 Shanghai, China

autor

Zhang Jie

• Shanghai Maritime University, 1550 Haigang Ave, 201306 Shanghai, China

Bibliografia

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2020).