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In this study, we experimentally investigate the boundary layer transition on the surface of a rotating dimpled sphere using hot-wire anemometry, focusing on understanding the relationship between characteristic velocity fluctuations observed during the transition process and the dimple configuration. The results indicate that the boundary layer transition is driven by high-frequency fluctuations, which occur as the dimples pass continuously in the streamwise direction, independent of the relative orientation between the freestream and the sphere’s rotation direction. Additionally, the direction of rotation affects the location of the transition point, causing it to shift in the direction of rotation.

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Characteristic Fluctuations Observed in Boundary Layer Transition Around Rotating Dimpled Sphere

  • 会议论文

  • 发表日期：

    2026年

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  • Shoji Sakaue,
  • Yusuke Tominaga,
  • Takakage Arai,
  • Masahide Onuki,
  • Takahiro Sajima

摘要

In this study, we experimentally investigate the boundary layer transition on the surface of a rotating dimpled sphere using hot-wire anemometry, focusing on understanding the relationship between characteristic velocity fluctuations observed during the transition process and the dimple configuration. The results indicate that the boundary layer transition is driven by high-frequency fluctuations, which occur as the dimples pass continuously in the streamwise direction, independent of the relative orientation between the freestream and the sphere’s rotation direction. Additionally, the direction of rotation affects the location of the transition point, causing it to shift in the direction of rotation.