A New Component of Viscous Resistance of Ships

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  • Baba Eiichi
    Experimental Tank, Nagasaki Technical Institute, Mitsubishi Heavy Industries, Ltd.

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Abstract

The findings on a new component of viscous resistance are outlined. From the experimental study and some theoretical approaches it has been pointed out that<BR>(1) The new component of resistance is associated with the expenditure of energy in generating turbulence due to the breakdown of waves at the bow of ships and governed by Froude's law.<BR>(2) In particular at ballast condition of fuller ships the component occupies most of the so-called wave resistance derived by the usual three-dimensional extrapolation method such as Hughes' method. On the other hand the wave resistance derived from the measured wave patterns is quite small.<BR>(3) The component can be derived from the measured head loss which appears near the free surface and outside the usual frictional wake belt.

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