Newman 



Fig. 5 - Bottom view of MARINER hull 

 in the circulating water channel show- 

 ing the flow pattern at a -3° drift angle 



The principal conclusion to be drawn from these flow photographs is that 

 for a hull such as the Mariner there is no large scale separation up to drift an- 

 gles of 10 degrees, if we assume that such a conclusion can be made from model 

 results with Froude scaling. On the other hand there will be local areas of sep- 

 aration, especially at the bilge keels and stern, and occasional traces of venti- 

 lation at the bow, and there will be a rather complex boundary -layer flow on the 

 afterbody which increases in thickness towards the stern. A consequence there- 

 fore is that a theoretical inviscid-fluid model based upon low aspect-ratio wing 

 theory or slender body theory, preferably with free surface effects included, 

 should give a satisfactory description of the flow over the forebody. It should 

 also suffice for describing the large-scale flow over the entire hull, at least for 

 steady-state drift angles up to ten degrees. Thus there is value in pursuing 



210 



