Paper title: CFD-Based Simulation of the Flow Around a Ship in Oblique Motion at Low Speed
J Chen, Z J Zou and M Chen, Shanghai Jiao Tong University, China
H M Wang, Zhejiang Ocean University, China
Ships tend to manoeuvre in oblique motion at low speed in situations such as turning in a harbour, or during offloading, dynamic positioning and mooring processes. The manoeuvrability criteria proposed by IMO are valid for ships sailing with relatively high speeds and small drift angles, which are inadequate to predict ship manoeuvrability in low speed condition. Hydrodynamic performance of ships manoeuvring at low speed is needed to know for safety issues. A CFD-based method is employed to predict the flow around an Esso Osaka bare hull model in oblique motion at low speed, where the drift angle varies from 0° to 180°. The URANS method with the SST k-ω model is used for simulating ship flows with drift angles 0°~30° and 150°~180°, and DES method for simulating ship flows with drift angles 40°~150°. Verification and validation studies are conducted for drift angles of 0° and 70°. The vortex structures at typical drift angles of 0°, 30°, 50°, 70°, 90° and 180° are analysed. The effects of drift angle and ship speed are demonstrated.
Transactions RINA, Vol 158, Part A4, International Journal Maritime Engineering, Oct-Dec 2016
DOI No: 10.3940/rina.ijme.2016.a4.374
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