A three-dimensional turbulent boundary layer was generated by exposing an initially two-dimensional boundary layer (Re{sub}θ ≈ 4000) to a strong spanwise pressure gradient. Velocity and Reynolds stress profiles were measured, extending well below y{sup}+ = 10, using a specially-designed near-wall laser Doppler anemometer in addition to conventional methods. Terms of the Reynolds stress transport equations for q{sup}2, - (u'v'){top}-, and - (v'w'){top}-are calculated at two profile locations. The mean flow is nearly collateral at the wall. Turbulent kinetic energy is mildly suppressed in the near-wall region and the shear stress components are strongly affected by three-dimensionality. The angles of stress and strain are misaligned, except very near the wall (around y{sup}+ - 10) where the angles nearly coincide with the mean flow angle. Three-dimensionality appears to reduce the production of turbulent kinetic energy and, more strongly, the production of - (u'v'){top}-.
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