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Flow over submerged bodies

  1. Jun 11, 2016 #1
    Guys...Can anyone explain me why fluid accelerates and then decelerates when flowing over a convex surface
    and also concept of flow attachment in simple terms
     
  2. jcsd
  3. Jun 12, 2016 #2

    jack action

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    It causes a reduction in cross-sectional area, so the velocity must be accelerated to keep up with the flow rate. It goes back to its original velocity once the obstruction is passed.
    As the cross-sectional area increases aft of the "bump", the fluid wants to fill the new enlarged area, so it tends to follow the shape of the part it gets around. Of course, the faster the fluid goes, the harder it will be for it to follow the shape.

    If you imagine a solid part moving in a non-moving fluid, you can imagine that, as it moves, it leaves an empty space while displacing the fluid in front of it. The fluid just want to fill the void to equilibrate everything once more, thus it looks like the fluid "sticks" to the part. If the fluid moves and the part is fixed, the same thing happens.
     
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