be proportional to the square root of the annular area between the body 

 surface and the edge of the turbulent boundary layer, which indeed is the 

 appropriate overall length scale of the thick stern boundary layer. 



ACKNOWLEDGMENT 

 The authors would like to thank the staff at the DTNSRDC Anechoic 

 Flow Facility for their cooperation during the testing and to express their 

 gratitude to John L. Leahy for his assistance with the instrumentation. 



49 



