CFD Analysis of Scale Effects on Conventional and Tip-Modified Propellers

Keun Woo Shin, Poul Andersen

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Full-scale propeller performance is traditionally predictedby scaling model-scale test results, but the traditionalscaling methods do not take into account hydrodynamicdistinctions of tip-modified propellers in full-scaleperformance. An open-water CFD analysis is made onscale effects of tip-modified and conventional propellers,which are designed for the same operating condition withidentical propeller diameter and expanded area ratio.While model-scale computations are made with atransition model, a fully turbulent flow is modeled in the full-scale computations. The investigation on the effectsof the transition model shows that laminar and transitionalflow modeling is crucial in model-scale computations.Grid-independent solutions at model and full scale areachieved by grid verification studies.
The CFD analysis of scale effects shows that theefficiency gain of the tip-modified propeller is increasedat full scale. The difference of scale effects between thetip-modified and conventional propellers is related toalterations of tip vortex and sectional pressuredistributions by the bent tip and the higher spanwiseloading at the tip region of the tip-modified propeller.
Original languageEnglish
Title of host publicationProceedings of the Fifth International Symposium on Marine Propulsors - smp'17
Number of pages8
PublisherVTT Technical Research Centre of Finland
Publication date2017
ISBN (Print)978-951-38-8606-6 , 978-951-38-8607-3, 78-951-38-8608-0
Publication statusPublished - 2017
EventFifth International Symposium on Marine Propulsors - Helsinki, Finland
Duration: 12 Jun 201715 Jun 2017


ConferenceFifth International Symposium on Marine Propulsors


  • Scale effect
  • Unconventional propeller
  • CFD
  • RANS
  • Transition model


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