Sahreiberj Bentkowsky and Kerr 



When the DSRV is approaching the distressed submarine 

 along its centerline and headed into the current, a suction force is 

 applied to the DSRV when it is within a one submarine diameter of 

 the hatch. Fig. 19, because of the accelerated flow and the associ- 

 ated reduced pressures between the DSRV and the hull. This suction 

 force increases as the displacement between the bodies, Z^, is 



decreased. The maximum value of the suction force, F, 

 a 1 knot current is 45.5 lbs. 

 theory presented in R-ef. 12. 



suction » 



for 



This result correlates well with the 



FLOW 



> 



DSRV 



TUNNEL C 



^ 



<=^^ 



-D -- 



SUBMARINE MODEL 



2 



FWD. HATCH 

 LOCATION 



GROUND PLANE 



ZT 



BsUB ■ ^80' 



•^SUB 



©METHOD OF REP. 3 

 -0.40 r 



5 10 15 20 25 30 5 10 15 20 25 30 



Zjj IN FEET 



Zq IN FEET 



Zp IN FEET 



Fig. 19. Time Independent Flow Interaction Forces -- DSRV Mating 

 Parallel to Submarine Centerline 



In contrast, when the DSRV is approaching the distressed 

 submarine athwartships and headed into the current, interaction 

 forces are applied to the DSRV when it is within 2-i/2 submarine 



diameters (75 feet) of the hatch. Referring to the solid C 



N«o 



curve 



of Fig. 20, it is apparent that the maximum suction force is also 

 45. 5 lbs, for this orientation in a 1 knot current. 



Note: The subscript 9o denotes that the attitude angle of the DSRV 

 is zero. 



1160 



