Numerical investigation on the performance of Wells turbine with non-uniform tip clearance for wave energy conversion

Zahari Taha, Sugiyono, T. M Y S Tuan Ya, Tatsuo Sawada

Research output: Contribution to journalArticle

28 Citations (Scopus)


The performance of a Wells turbine with various non-uniform tip clearances was investigated using computational fluid dynamics (CFD). The investigation was performed on numerical models of a NACA0020 blade profile under steady flow conditions. The performance of turbines with uniform and non-uniform tip clearances was compared. The results were also compared with experimental results in literature. It was shown that the performance of turbine with non-uniform tip clearance is similar with that of turbine with uniform one in terms of torque coefficient, input power coefficient, and efficiency. However, the turbine with non-uniform tip clearance seems to have a preferable overall performance. An investigation on the flow-field around the turbine blade was performed in order to explain the phenomena.

Original languageEnglish
Pages (from-to)321-331
Number of pages11
JournalApplied Ocean Research
Issue number4
Publication statusPublished - 2011 Oct



  • CFD
  • NACA0020 blade profile
  • Tip clearance
  • Wells turbine

ASJC Scopus subject areas

  • Ocean Engineering

Cite this