CFD Analysis of Ship Propeller Thrust Breakdown

Keun Woo Shin, Poul Andersen

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Abstract

The variation of propeller performance with respect to cavity extent over the blade surface is investigated by DES with a cavitation model. INSEAN E779A propeller is considered as a test case, because the cavitation tunnel test results of thrust and torque breakdowns with respect to cavitation number and cavity extent are available for several loading conditions (Pereira et al 2004a). Cavitation simulation results are validated against the experimental result at two cavitation numbers in the highest loading condition among those considered in the experiment. In the validation, the effects of the transition model and the seed density on cavity extent and propeller performance are examined and the propeller inflow is adjusted to reach the measured thrust instead of modeling the blockage effect of the cavitation tunnel. Cavitation simulations are made with varying cavitation number. The comparison of the CFD and experimental results shows a reasonable agreement in the variations of cavity extent, thrust and torque in moderate cavitation. Thrust and torque breakdowns are simulated at higher cavitation numbers and larger cavity extents in CFD, as cavity area is overestimated especially in extensive cavitation.
Original languageEnglish
Publication date2019
Number of pages9
Publication statusPublished - 2019
EventSixth International Symposium on Marine Propulsors (smp'19) - Roma Centro Hotel, Rome, Italy
Duration: 26 May 201930 May 2019

Conference

ConferenceSixth International Symposium on Marine Propulsors (smp'19)
LocationRoma Centro Hotel
CountryItaly
CityRome
Period26/05/201930/05/2019

Keywords

  • Thrust breakdown
  • Cavitation
  • CFD
  • INSEAN E779A
  • DE

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