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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

Water Table Wall Shear Stress Spreading Rate Front Part Laminar Boundary Layer 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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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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