in the outer region was also modified by an algebraic formula with the in- 

 tention of improving the accuracy of the velocity profiles near the body 

 in the thick boundary layer region. The final modification to the original 

 method uses the predicted potential flow velocities outside of the dis- 

 placement body to modify the velocities in the direction parallel to the 

 body meridian tangent. 



MEASURED AND COMPUTED PRESSURE AND SHEAR 

 STRESS DISTRIBUTIONS 



Pressure taps were used to measure the steady pressure at 15 selected 



locations along the stern surface of the axisymmetric body. The pressure 



coefficient, C is computed from the measured pressures by the relation- 



P 

 ship 



P-Pn P-Pn 

 C = — ^ = -^ ^ (1) 



p p -p 1 ,,z 

 ^ '^t '^s ■;7 P U- 



where p = measured local static pressure 



p = measured ambient pressure 



p = measured dynamic total pressure 



p = measured static pressure 

 s 



p = mass density of the fluid 

 The analytically-predicted pressure coefficient was computed on the dis- 

 placement body using the Douglas-Neumann potential flow method of Hess and 

 Smith and is given by 



U ^2 



p Vu 







C = 1 - 77^ (2) 



where U is the computed potential flow velocity on the displacement body 

 e 



and U is the freestream velocity, 150 ft/sec (45.72 m/s) . 



10 



