On Viscous Flow around Marine Propellers--Hub Vortex and Scale Effect

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  • On Viscous Flow around Marine Propellers
  • —Hub Vortex and Scale Effect—

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Recently, the simulation technology by CFD (Computational Fluid Dynamics) has made remarkable progress. The method has become to be applied to viscous flow problems around not only various ship hulls but also marine propellers. Consequently many difficult problems on flow analysis on account of remarkable viscous effect are being resolved. There are also many subjects related to viscous effect of the flow around marine propellers. In this paper the author presents the topics about hub vortex and scale effect of propeller performance characteristics. The used analytical method consists of commercial CFD software and multifunctional grid generation software. As a result, the structure of flow around hub vortex and the difference of scale effect due to propeller shapes were revealed. These results show that the method is useful for design of such energy-saving devices as PBCF (Propeller Boss Cap Fins) or Kawasaki RBS-F (Rudder Bulb System with Fins), for ship power estimation with higher accuracy and for improvement of propellers performance.

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