Wave Creation

Discussion in 'Hydrodynamics and Aerodynamics' started by rwar, Jan 25, 2016.

  1. daiquiri
    Joined: May 2004
    Posts: 5,373
    Likes: 247, Points: 73, Legacy Rep: 3380
    Location: Italy (Garda Lake) and Croatia (Istria)

    daiquiri Engineering and Design

    It cancels out the wave on one side of the vessel through the mechanism of wave interference.
    Regarding the efficiency, please re-read my post. I've explained why it implies an increase of efficiency.

    If you have, say, 100 HP of power to spend for the creation of waves, two scenarios are possible:
    1) you create symmetrical wave train, thus dedicating 50 HP to each side (port and starboard);
    2) you create an assymmetrical wave train like Weinblum, thus using all 100 HP (in ideal case) for making a wave train in the desired direction only.

    The formula for wave power is given here: https://en.wikipedia.org/wiki/Wave_power#Wave_power_formula. It says that, everything else being equal, the wave height is proportional to the Power^0.5.
    So, since in case 2 the power input for a wave train on the desired side is twice that of the case 1, it means that the Weinblum configuration could ideally give you 40% higher waves for the total power input of 100 HP.
    Of course, in real life it would be an unknown fraction of that value, but IMO still better than dissipating waves (and power) in all directions around the boat.

    Cheers
     
  2. Leo Lazauskas
    Joined: Jan 2002
    Posts: 2,696
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    Location: Adelaide, South Australia

    Leo Lazauskas Senior Member

    There are many different systems that still need investigating for
    this application.

    The attached paper about the development of a continuously surfable
    wave in a circular tank used Michlet as a preliminary method to
    calculate wave heights. Even though the program is ill-suited for
    large wave-makers, it can give the relative merits of different
    shapes very quickly.
     

    Attached Files:


  3. daiquiri
    Joined: May 2004
    Posts: 5,373
    Likes: 247, Points: 73, Legacy Rep: 3380
    Location: Italy (Garda Lake) and Croatia (Istria)

    daiquiri Engineering and Design

    Martin R. Renilson... The world is a small place indeed. :)

    Thanks for the paper Leo. Looks like CFD would be more suitable tool for the analysis. Michlet predictions are way off the target in this particular case.
     
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