that the free surface effect on the velocity profile on the body surface 



would be significantly dependent upon whether the hull is in a shallow 



towing tank or in unbounded water. The present study indicates that the 



approximate speed correction formula satisfactorily treats the seemingly 



complicated free-surface effect on the mean-speed increment on the body. 



The total resistance coefficient C , determined experimentally by 



Tamura, and the wave resistance coefficients C computed by the finite 



w 



element method, are given in Table 4. 



In presenting our results, the total resistance coefficient C and 



the wave resistance coefficient C are defined as 



w 



c T = ^/f u 2 * 2/3 



(12) 



C =R/fu 2 V 2/3 

 w w/ z 



where R^ and R are, respectively, the total and wave resistances. 



T w /^ 



The frictional resistance coefficients, C and C , are defined by 



r r 



C F ' *,/§ « 2 S o 



„ (13) 



S - S • -273 - h/i » 2 ^ 



where S is the model wetted surface area. The model length Froude number 

 F and Reynolds number R are defined by 



F L = U//gL 



R = v/V5l 



(14) 



10 



