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Underwater Dynamics question

  1. Jan 29, 2017 #1
    For a given submersible object that has 360 directional maneuverability, what would be an ideal shape for that object?
    Sphere?
    **360 degree directional maneuverability meaning jets strategically placed around the object for propulsion, without rotating the object
     
    Last edited: Jan 29, 2017
  2. jcsd
  3. Jan 29, 2017 #2

    Nidum

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    Much depends on what the purpose of the object is , it's size and how it is powered .

    For a large sized object like a submarine which moves at relatively high speeds it is almost always easier to change position using steered turns under forward motion - just like for a car . Normal streamline shapes are best for this . Auxiliary thrusters are sometimes used but only for position control at lower speeds .

    For smaller objects like underwater cameras which move relatively slowly the use of directional thrusters is more practical . In this case the shape of the object is not that important and is usually decided by simple practical considerations . Several different thruster systems are used . Most common is a single thruster which can be swung round to different angles relative to the hull . Thruster is usually either a propeller and drive which can be swung round complete or a fixed propeller and drive with moveable guide vanes .
     
    Last edited: Jan 29, 2017
  4. Feb 5, 2017 #3

    Baluncore

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    Does the vessel have a pressure hull? If it will dive deep it will need a spherical pressure hull.

    A sphere does not travel well, so surround the pressure hull with a hydrodynamic lenticular outer hull, (water flooded), so it looks more like a flying saucer with only the top and bottom of the sphere showing outside the lens. That has less horizontal drag and can traverse efficiently in any direction without needing to rotate.
    To rise or fall, avoid vertical movement. It would be more efficient to tilt and traverse in a zigzag, or travel in a wide spiral.
     
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