Computation and Experiment of Propeller Performance and Flow Field around Self-propelled Model Ship in Regular Head Waves

摘要

The present work focuses on the importance of ship verticalmotions to propeller performance in waves. The motions ofand flow field around the model tanker KVLCC2 (KRISOvery large crude oil carrier 2) were predicted and measured infully-loaded condition at design Froude number Fr=0.142 inregular head waves. In CFD prediction, the propellerperformance was simulated by a body-force propeller modelcoupled with the URANS code. The ship forward speeddiffraction problem is analyzed numerically with and withoutpropeller, and then the ship for free heave and pitch conditionwith propeller is further investigated by EFD and CFD forselected wavelengths (λ/L=0.6, 1.1 and 1.6). Furthermore, theforced vertical motions of the ship in calm water, i.e. theradiation problem, are studied. In the present study, CFD andEFD results show the good agreement for ship motionresponses, time histories of thrust and complicated local flowfield around the self-propelled ship in waves. The phase lag isaffected by the ship motions for different wavelength cases.Also, the thrust oscillations have larger amplitude with higherharmonic components for long wavelength results.