Malavard 



Fig. 27 - Comparison of analogic computation of flow 

 around thick bodies with Havelock's solution 



each iteration. We hope these studies will be a valuable contribution to the 

 problem of thick hulls and wave resistance, which is one of the most important 

 aspects of naval hydrodynamics. 



CONCLUSION 



The purpose of this paper was to give a glimpse of the possibilities of 

 rheoelectric analogies in the field of theoretical naval hydrodynamic problems. 

 The examples given were chosen to illustrate these possibilities and may be 

 summed up as: sub- and supercavitating hydrofoil problems, with or without 

 free- surface effect; supercavitating cascade design; hydrodynamic character- 

 istics and optimum design of finite- span wings, with or without free- surface, 

 strut, and wall effects; design of sub- and supercavitating marine screw pro- 

 pellers; and finally, a tentative method for solving the problem of thick hulls. 



Rheoelectric analogy is a very suitable method of study for these hydro- 

 dynamic problems, because most of them can be considered as potential flows 

 defined by the Laplace equation. The rheoelectric tank is, indeed, a practical 

 and effective method of simulation of these harmonic functions. The knowledge 

 of their bomdary conditions is sufficient for realizing the simulation. There- 

 fore it is not necessary hereafter to look for an explicitly analytical formulation 

 of the problems. 



410 



