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Kármán vortex street

  1. Feb 15, 2010 #1
    I was reading about http://en.wikipedia.org/wiki/Aeolian_harp" [Broken]. It is explained that "the harp is driven by von Karman vortex street effect"
    So I read about http://en.wikipedia.org/wiki/Von_Karman_vortex_street" [Broken]. I also read a few other sources on von Karman vortex street effect.

    It is known for the steady flow around a smooth circular cylinder that:
    • for Re < 5 no separation of the flow occurs;
    • for 5 < Re < 40 a fixed pair of symmetric vortices exists in the flow;
    • for 40 < Re < 200 laminar vortex street exists in the flow;

    My question is why the flow changes its regime? I. e. why the vortices appears for Re > 5 and why the vortices begin to shed (and what force makes them to so) for Re > 40 and what force made them stay (not shed) for Re < 40? Why do they shed in that ("chess-board", "lamp-post", etc) particular order?

    And has any research been done on the topic at all? (I mean exactly why the regime changes. I understand that for each separate regime a lot of research has been done)

    Can anyone please explain or point me to such an explanation?

    Thank you!
     
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Feb 18, 2010 #2
    Anyone, please?

    Sorry, may be I posted to a wrong section of the forum. I am not actually a physicist.
    I'm willing to learn to understand the explanation but I need to know if the explanation exists in the first place.
     
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