Abstract

This is a study on the effect of hull roughness on ship resistance components (especially full viscous resistance), which is tested using wind-tunnel experiments and Computational Fluid Dynamics (CFD) simulations. With the wind-tunnel experiment, a full viscous resistance analysis can be carried out to further explore changes in the friction and pressure resistance only without the wave resistance. In the experiments, the roughness model used sandpaper with an average roughness height (ka) = 162 µm, that then it was predicted equal with ks = 1475 µm. In the CFD simulations, the roughness parameter was represented by an equivalent sand grain roughness height (ks), and this was varied by several levels. The results indicated that there was a significant increase in ΔCT (up to 73.7%) and ΔCF (up to 106.96%), but only a slight increase in ΔCP (up to 10.57%). The trend of the increase in resistance due to ks and Reynolds numbers were also discussed. The parameter ks were very influential on ΔCF, but had only a slight effect on ΔCP. With the significant results about the increase in ship resistance due to the roughness, both the friction and the pressure resistance component will lead to an increase in fuel consumption on a ship then it will increase levels of carbon emissions in the air.

Original languageEnglish
Pages (from-to)144-163
Number of pages20
JournalJournal of Sustainability Science and Management
Volume16
Issue number3
DOIs
Publication statusPublished - Apr 2021

Keywords

  • Ship resistance
  • biofouling
  • computational fluid dynamics
  • roughness
  • wind-tunnel experiment

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