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Title: Hydrodynamic forces on oscillating submerged bodies at forward speed
Author: Wu, Guoxiong
Awarding Body: University of London
Current Institution: University College London (University of London)
Date of Award: 1986
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This work attempts to solve the problem of a ship advancing in waves using potential theory. The results of resistance in otherwise calm water and hydrodynamic coefficients of oscillating submerged bodies at forward speed are presented. For the resistance problem the free surface condition is linearized but the body surface condition is exactly satisfied; while for the oscillating problem both conditions are linearized. The linearized mathematical model is discussed in detail and a review of previous work on ship motions especially the strip theory is given in chapter one. Following the introduction, the mathematical equations are derived and the details of numerical procedure to be adopted are discussed in chapter two. This numerical method combines localized finite elements in the near region with representation by a boundary integral equation in the far field. The method is first examined at two dimensional level in chapter three by considering infinitely long cylinders. After a review of previous work on ship wave resistance, the method is then extended to general three dimensional submerged bodies in chapter four. The further extension of the present method to more general problems in ship hydrodynamics such as nonlinear wave resistance, the motion through an arbitrary time history, the added resistance in a regular sea, the elastic deformation of the ship, etc, is discussed. An analytical formulation for the potential problem of a submerged spheroid advancing in waves is presented for the purpose of providing a basis to check the numerical results. It is confirmed that the present method is one of the most promising methods in ship hydro dynamics.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available