The IUTAM Symposium on Three-dimensional Turbulent Boundary Layers was suggested by the Gesellschaft für Angewandte Mathe matik (GAMM) and sponsored by the International Union of theor etical and Applied Mechanics. The symposium was organized by H.H. Fernholz (Hermann-Föttinger-Institut für Thermo- und Fluiddynamik der Technischen Universität Berlin) and E. Krause (Aerodynamisches Institut der RWTH Aachen). After two success ful Euromech Colloquia on the same topic in Berlin 1972 and Trondheim 1975 the organizers felt that another meeting should be convened, this time with participants from inside and out side Europe. The aim of the symposium has been to bring together scientists who are actively engaged in boundary layer research, both ex perimental and theoretical. The scope of the meeting encompass ed incompressible and compressible three-dimensional turbulent boundary layers. Special emphasis was laid on economical cal culation methods, on measurements of fluctuating quantities and on measuring techniques designed for and applied success fully to three-dimensional boundary layers. From among thirty-four papers submitted for presentation, twenty six contributions of twenty-five minutes each were selected by the European mernbers of the Scientific Committee. Furthermore there were four invited lectures of forty-five minutes. Short discussions were held directly after each presentation with a long discussion period at the end of each day. The final dis cussion on the last day of the symposium was recorded on tape and is presented in a slightly shortened version as the last contribution in this volume.

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Session 1.- Some Notes on Three-Dimensional Turbulent Boundary Layer Data and Turbulence Modelling.- Experimental Techniques in Three-Dimensional Turbulent Boundary Layers.- Session 2.- Measurements in a Pressure-Driven and a Shear-Driven Three-Dimensional Turbulent Boundary Layer.- Turbulence Measurements in Ship-Model Flow.- Measurements of Reynolds-Stress Profiles in the Stern Region of a Ship Model.- Session 3.- A Method of Flow Field Determination for Moderately Skewed, Three-Dimensional Flows.- New Developments in Open Separation.- Unsteady Structures of a Separated Three-Dimensional Turbulent Boundary Layer.- Effect of Crossflow on the Vortex-Layer-Type Three-Dimensional Flow Separation.- Session 4.- Wind Tunnel Investigations of some Three-Dimensional Separated Turbulent Boundary Layers.- Experiments on a Flow With Swept Separation and Reattachment of a Boundary Layer.- Session 5.- Three-Dimensional Boundary Layers in Turbomachines.- Experimental Study of the Boundary Layer on a Turbomachinery Rotor Blade.- Boundary Layers on Bodies of Revolution Spinning in Axial Flows.- Effect on a Developed Turbulent Boundary Layer of a Sudden Local Wall Motion.- Session 6.- Some Measurements in the Intermittent Region of a Turbulent Boundary Layer along a Corner.- Three-Dimensional Turbulent Boundary Layer along a Concave Wall.- Three-Dimensional Structure of the Turbulent Wake behind an Intersecting Cruciform Circular Cylinder.- Session 7.- The Three-Dimensional Turbulent Boundary Layer under the Sea Surface not available at the day of printing.- Three-Dimensional Shock Wave/Turbulent Boundary Layer Interactions: Some Observations and Conjectures.- An Investigation of Surface Flow Pattern and Pressure Distribution for Viscous, Sonic Flow over Hemisphere-Cylinder at Incidence.- Session 8.- Cross-Hatching An Interaction between Shock and Turbulent Boundary Layer.- Session 9.- The Numerical Computation of Three-Dimensional Boundary Layers.- Integral Method and Turbulence Models Applied to Three-Dimensional Boundary Layers.- A Method for Three-Dimensional Boundary Layer Calculations on Arbitrary Bodies: Some Results on Aircraft Wings and Engine Cowls.- Session 10.- Comparison of Three-Dimensional Turbulent Boundary-Layer Calculations with Experiment (presented by E. Krause).- A Three-Dimensional Law-of-the-Wall Including Skewness and Roughness Effects.- Numerical Study of Corner Flows.- Session 11.- Three-Dimensional Boundary-Layer Calculations in Design Aerodynamics.- Turbulent Boundary Layers on Three-Dimensional Configurations.- An Evaluation of the Final Discussion of the IUTAM Symposium on Three-Dimensional Boundary Layers.