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.

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.