Measured values of eddy viscosity and mixing length in the thick stern boundary 

 layer were found to be smaller than values which have been proposed for thin 

 boundary layers. Because eddy viscosity and mixing length models play an important 

 role in boundary-layer calculations, a modification of the theoretical mixing length 

 model is proposed which may improve the prediction of the boundary layer. 



Further work in this area is needed. A larger data base of experimental results 

 on a variety of three-dimensional geometries will aid in the development of improved 

 theoretical models to predict the viscid-inviscid stern flow interaction. The pro- 

 posed new mixing length formulation must be evaluated further. 



ACKNOWLEDGMENTS 

 The authors would like to thank the staff at the DTNSRDC Anecholc Flow Facility 



for their cooperation during the testing and to express their gratitude to Dr. K.C. 



2 

 Chang for his many consultation sessions on the use of the C K computer program. 



19 



