Numerical Simulation of Ship Waves by Direct Integration of Navier-Stokes Equations,
TOKYO UNIV (JAPAN) DEPT OF NAVAL ARCHITECTURE
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Linear wave making theories are usually unsuccessful in estimating wave resistance of practical hulls. This is essentially attributable to the nonlinearity of the free surface phenomena. Experimental studies clarified that generation of steep waves, called free surface shock waves is the most significant phenomenon and that it is followed by the energy-deficient phenomena of wave breaking and free surface turbulence. Because the steep waves are generated in the near-field where disturbance velocities are grossly of the same order of magnitude with the uniform stream, the nonlinearity of the free surface condition must be thorougly taken into account in computation of waves and wave resistance. One of the methods that can apply the exact nonlinear free surface condition and can take viscosity into account in the MAC method. At the Experimental Tank of the Univ. of Tokyo the modified MAC method called Tokyo University Modified Marker-And-Cell TUMMAC method has been continuously developed mostly for simulation of waves generated by advancing bodies in deep water. In this paper TUMMAC IV is employed for the simulation of waves and flow field of a Wigleys hull. TUMMAC-IV, which is under development, is capable of computing waves generated by ships of arbitrary hull form. At the present stage of development of the TUMMAC are not yet attained. Only the waves of fore-bodies are presented and compared with experiment.