An Experimental Study of the Structure and Spreading of Turbulent Spots

  • Per-Ake Lindeerg
  • E. Magnus Fahlgren
  • P. Henrik Alfredsson
  • Arne V. Johansson
Part of the International Union of Theoretical and Applied Mechanics book series (IUTAM)

Summary

Turbulent spots in a free surface water table flow were studied. Flow visualization suggested that the reported differences in shape between the water table and laminar boundary-layer spots may be ascribed to relaminarization of the front part of the former. Linear stability analysis of velocity profiles measured just outside the “wing-tip” of the spot indicated a reduced stability of the flow in this region as compared to the undisturbed laminar flow, which may be seen as a support for a growth-by-destabilization concept. The stability of the flow in this region was also examined in a more direct way by introducing a small secondary disturbance near the wing-tip of the spot.

Keywords

Vortex Syringe 

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Copyright information

© Springer-Verlag, Berlin, Heidelberg 1985

Authors and Affiliations

  • Per-Ake Lindeerg
    • 1
  • E. Magnus Fahlgren
    • 1
  • P. Henrik Alfredsson
    • 1
  • Arne V. Johansson
    • 1
  1. 1.Department of MechanicsThe Royal Institute of TechnologyStockholmSweden

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