Preface 



The Twelfth Symposium on Naval Hydrodynamics 

 was held at Washington, D.C., during the period 

 5-9 June 1978 under the joint sponsorship of the 

 Office of Naval Research, the David W. Taylor Naval 

 Ship Research and Development Center, and the 

 National Academy of Sciences. 



The technical program of the Symposium con- 

 sisted of eight sessions equally apportioned among 

 the following four subjects of great current inter- 

 est in the general field of naval hydrodynamics: 

 (1) boundary layer stability and transition, (2) 

 ship boundary layers and propeller hull interaction, 

 (3) cavitation, and (4) geophysical fluid dynamics. 

 Tours of the hydrodynamic research facilities of 

 the David W. Taylor Naval Ship Research and Devel- 

 opment Center and of Hydronautics, Inc., were also 

 included in the technical program. 



It is interesting to recal that the National 

 Academy of Sciences was a cosponsor of the First 

 and Second Symposia in this series which were held 

 respectively in 1956 and 1958. It is a great plea- 

 sure to acknowledge once again the invaluable 

 assistance of the Academy in launching these Sym- 

 posia and in establishing the high standards of 

 quality and style for them by which we are guided, 

 even to this day. 



Similarly, the David W. Taylor Naval Ship 

 Research and Development Center has played an 

 important role in the series of Symposia on Naval 

 Hydrodynamics from their very inception. Scien- 

 tists and engineers from the Center have presented 

 outstanding scientific papers at each of the Sym- 

 posia and have, in addition, participated in an 

 informal manner in the planning of many of the 

 earlier ones. 



For these reasons the Office of Naval Research 

 is especially pleased and honored at the opportu- 

 nity presented by the cosponsorship of this Twelfth 



Symposium to renew and continue the fruitful col- 

 laboration with its old scientific allies. We are 

 deeply grateful for their generous assistance in 

 the past and present, and look, forward with confi- 

 dence to their continued support in the future. 



Of the seemingly endless list of people who 

 contributed in large and small ways to the planning 

 and organizing of the Twelfth Symposiiim the follow- 

 ing deserve special recognition: Professor George 

 F. Carrier of Harvard University and the Naval 

 Studies Board of the National Research Council, who 

 served as chairman of the Program and Organizing 

 Committee; Dr. William E. Cummins of the David W. 

 Taylor Naval Ship Research and Development Center, 

 who served as vice-chairman of the Committee, and 

 his colleagues from the ^^nter. Dr. Wen Chin Lin, 

 Mr. Justin H. McCarthy, Jr. and Mr Vincent J. 

 Monacella, who served on the Committee; Mr. Lee M. 

 Hunt of the Naval Studies Board, who served on the 

 Committee and who, with the able assistance of 

 Miss Virginia A. Harrison, personally carried out 

 the multitude of detailed arrangements required for 

 the success of the Symposium; and Dr. Nelson T. 

 Grisamore of the National Academy of Sciences, who 

 edited these Proceedings. 



A special note of appreciation is extended to 

 Mr. Phillip Eisenberg, President of Hydronautics, 

 Inc., for his delightful after-dinner talk at the 

 Symposium Banquet and for the tour of Hydronautics, 

 Inc., which he graciously arranged for the partic- 

 ipants of the Symposium. 



To all of these, and many more, the Office of 

 Naval Research is forever indebted. 



Ralph D. Cooper 



Office of Naval Research 



