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Predicting the behavior of turbulent spots is critical in modeling the late stage of laminar-turbulent transition in boundary layers. While these spots have been studied for over 70 years and are relatively well understood, their development under the influence of free-stream turbulence (FST) remains less explored. Previous investigations suggest that the characteristics of the incoming FST influence the spreading parameters of turbulent spots. The present study delves deeper into this phenomenon, utilizing a novel experimental setup featuring wall-mounted microphones to track individual, naturally occurring turbulent spots under varying FST conditions. The findings reveal variations in both, the growth rates and the number of generated spots.

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Experimental Study of Turbulent Spots in Free-Stream Turbulence Induced Boundary Layer Transition

  • 会议论文

  • 发表日期：

    2026年

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  • André Weingärtner,
  • Imge Yigili,
  • Jens H. M. Fransson

摘要

Predicting the behavior of turbulent spots is critical in modeling the late stage of laminar-turbulent transition in boundary layers. While these spots have been studied for over 70 years and are relatively well understood, their development under the influence of free-stream turbulence (FST) remains less explored. Previous investigations suggest that the characteristics of the incoming FST influence the spreading parameters of turbulent spots. The present study delves deeper into this phenomenon, utilizing a novel experimental setup featuring wall-mounted microphones to track individual, naturally occurring turbulent spots under varying FST conditions. The findings reveal variations in both, the growth rates and the number of generated spots.