Artificial control of the three-dimensionalization process of T-S waves in boundary-layer transition

Takuma Kato, Yu Fukunishi, Ryoji Kobayashi

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


An attempt to control the three-dimensionalization process of T-S waves by utilizing the receptivity of a three-dimensional roughness element on a flat-plate boundary layer to outer acoustic disturbances is carried out by wind-tunnel experiments. The term "receptivity"(1) describes the process through which external disturbances are transformed into instability waves in a boundary layer. It is known that several types of oblique waves can be found in the three-dimensionalization process in the later stages of the boundary-layer transition. In the present experiment, we artificially introduce oblique waves in the boundary layer in order to control the boundary-layer transition. It is shown that an oblique wave can be generated in a flat-plate boundary layer with a roughness element attached to the plate inclined and an acoustic forcing. An attempt to induce three-dimensionalization modes that are observed in the later stages of boundary-layer transition is also carried out. However, the natural three-dimensional mode flow structures could not be generated by our method.

Original languageEnglish
Pages (from-to)536-541
Number of pages6
JournalJSME International Journal, Series B: Fluids and Thermal Engineering
Issue number4
Publication statusPublished - 1997 Nov


  • Boundary Layer
  • Flow Control
  • Receptivity
  • Tollmien-Schlichiting Wave
  • Transition

ASJC Scopus subject areas

  • Mechanical Engineering
  • Physical and Theoretical Chemistry
  • Fluid Flow and Transfer Processes


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