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Reliable tolerance criteria for step heights are necessary for laminar designs. Existing criteria for crossflow-dominated laminar-turbulent transition neglect the impact of crossflow instability amplitude at the step location. This study in an incompressible flow quantifies this effect by varying the instability amplitude through a systematic variation of the diameter of discrete roughness elements used to excite stationary crossflow instabilities. It is shown that critical step height Reynolds numbers decrease approximately linearly with increasing instability amplitude.

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Experimental Study of the Instability Amplitude Effect on Critical Step Heights in Crossflow-Dominated Transition

  • 会议论文

  • 发表日期：

    2026年

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  • Hans Peter Barth,
  • Stefan Hein

摘要

Reliable tolerance criteria for step heights are necessary for laminar designs. Existing criteria for crossflow-dominated laminar-turbulent transition neglect the impact of crossflow instability amplitude at the step location. This study in an incompressible flow quantifies this effect by varying the instability amplitude through a systematic variation of the diameter of discrete roughness elements used to excite stationary crossflow instabilities. It is shown that critical step height Reynolds numbers decrease approximately linearly with increasing instability amplitude.