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I Strange Magnus Force in a Whirlpool

  1. Apr 23, 2016 #1
    whrilpool.png
    1. Imagine a big river with water flowing constant velocity , assume there is a whirlpool at center as shown in the figure.

    2. Because of the magnus force the whirlpool should move towards left or right towards river bank depending on the spin, but it does't happens it just stays fine in its position....so why?

    3. I belive that magnus force will exists in whirl pool only when the velocity of water changes (acceleration), not just velocity , since the whirlpool is itself a part of the water flow.

    4. apply the same to tornado and faraday's law of electromagnetic induction (as anology).
     
    Last edited: Apr 23, 2016
  2. jcsd
  3. Apr 23, 2016 #2

    mfb

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    Your whirlpool would have to be a solid object to apply the Magnus force. It is not.
    In addition, the whirlpool is probably formed by some feature of the ground, and this feature does not move.
     
  4. Apr 23, 2016 #3
    its a thought experiment, question is will the conical structure of wirpool bend towards right or left when the water current changes ?
     
  5. Apr 23, 2016 #4

    mfb

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    What happens to your whirlpool depends on the cause of it, and tons of details of the flow system.
    The left side has a slower flow which will influence the flow pattern, but the details depend on the details of the system.
     
  6. Apr 24, 2016 #5
    ok forget the whirlpool imagine a tornado, suppose a strong wind current flows towards it will it experience a magnus force?
     
  7. Apr 24, 2016 #6

    mfb

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    A wind blowing over water? No.
     
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