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nik2011
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I was reading about http://en.wikipedia.org/wiki/Aeolian_harp" . 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" . 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:
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!
So I read about http://en.wikipedia.org/wiki/Von_Karman_vortex_street" . 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!
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