Mori 3 Inui and Kajitani 



Differentiating Equation (17) as to x, y, z and integrating 

 all over the distribution plane, the velocity components u, v, w are 

 also written as 



u = u 2 + u 2 + u 3 



v = v + v 2 + v (22) 



w = w + w + w 



In finite Froude number problem, the free wave terms 

 u„ , v. , and w« and a part of local disturbance u 3 , v- , and 

 Wj play important role which is shown in Figure 2 9 in the case of 



M 21 and K Q L = 12, 



Based upon the "exact" hull- surface condition, 



o- f(x, z) df(x, z) _ df(x, z) 



v " *„ u " s~: w _ tt: — \^ 5 ) 



where y = f(x, z) denotes the half -breadth of the hull, the "exact" 

 hull -gene rating sources for finite Froude number K Q L =12 are ob- 

 tained with M 21. 



This result is presented in Figure 30 together with the 

 double -model approximation m( £ ) and the wave -analyzed source 

 m(€). 



The corresponding amplitude function is also given in 

 Figure 31. 



From Figures 30 and 31, it may be concluded that the 

 effect of finite Froude number for the hull- surface condition can ex- 

 plain the cause of the correction function a ( £ ) partially, but not 

 completely. 



VI. 2. Free-Surface Condit ion 



Before discussing the problem (b), we assume that the se- 

 cond order term for the free-surface condition is independent of the 

 higher contribution of the hull-surface condition (VI. l). The velocity 



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