In this thesis we derive a mathematical and numerical model that can determine the motions of and the forces on a ship sailing in waves. Emphasis is laid on making the model suitable for moderate and high speeds of the ship. For low speeds, various models already exist that are too simple however, to obtain reliable results when we increase the speed, because they use a very simple approximation of the steady flow around the ship. Because the interaction between the steady flow around the ship on the one hand and the incoming waves, the motion of the ship and the drift forces on the other hand is very strong, we need a better description for the steady flow. Therefore, we use the non-linear steady flow, that can be determined by RAPID, to model the steady flow around the ship. It is very hard to determine the remaining, time-dependent waves that propagate over the steady waves, because some non-linearities are involved. Therefore, we make some assumptions on the steepness of these time-dependent waves and the amplitudes of the motions of the ship, which allow us to linearize the equations that describe the propagation of these waves and the ship's motions.


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    Title :

    Seakeeping Calculations for Ships, Taking into Account the Non-Linear Steady Waves


    Contributors:
    T. Bunnik (author)

    Publication date :

    1999


    Size :

    140 pages



    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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