Calculation of Ship Viscous Resistance and Its Application

概要

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The present paper describes a method for calculating viscous resistance of ships based on a higher order boundary layer theory, which is solved by the integral method. Higher order terms in the direction normal to the hull surface were thoroughly examined on the basis of the flow characteristics measured near the stern for an 8 meter long ship model. Viscous-inviscid interaction is taken into account by an iterative calculation procedure with underrelaxation method. The frictional and viscous pres-sure resistance components are calculated separately by integrating wall shear stress and pressure over the hull surface to obtain explicitly the correlation between hull form and viscous resistance components. Furthermore, in order to change the ship hull form systematically and easily, the ship form is represented by use of the exponential splines. From comparison between calculations and measurements, it is found that the present method predicts the viscous resistance of full form ships with allowable accuracy and will become a useful tool for systematic investigations of various ship forms in the course of hull form design.