Resistance, back to basics

Discussion in 'Hydrodynamics and Aerodynamics' started by Lietuvis, Feb 23, 2018.

  1. Lietuvis
    Joined: May 2011
    Posts: 16
    Likes: 0, Points: 1, Legacy Rep: 10
    Location: Lithuania

    Lietuvis Junior Member

    Hello. I'm doing CFD simulation of the hull and i'm getting outputs for x pressure force, y pressure force, z pressure force and shear forces. Maybe my question will sound stupid, but should i consider z axis pressure (or even y axis) for resistance? As i understand some of the thrust will be used to lift hull upwards (extreme example of this would be hydrofoils or planning hulls), so total resistance should be x pressure + z pressure - displacement + shear forces? Or is it just x pressure and shear forces?

    Note: z is pointing downwards (or maybe upwards)
     
  2. DCockey
    Joined: Oct 2009
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    Location: Midcoast Maine

    DCockey Senior Member

    Do you have an engineering or physics background? Do you understand the concept of forces as vectors?
     
  3. Lietuvis
    Joined: May 2011
    Posts: 16
    Likes: 0, Points: 1, Legacy Rep: 10
    Location: Lithuania

    Lietuvis Junior Member

    Yes i have. I just never thought about hydrodynamic lift in displacement ships and its influence for resistance.
     

  4. patzefran
    Joined: Feb 2011
    Posts: 188
    Likes: 14, Points: 18, Legacy Rep: 10
    Location: france

    patzefran patzefran

    So you understand you can't add force components on different axis !
     
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