EFFECT OF WALL SUCTION ON BURSTING IN A TURBULENT BOUNDARY-LAYER

The effect of suction on the wall region of a turbulent boundary layer over a slightly heated wall has been quantified in terms of several aspects of the motion that are related to bursts and sweeps. These events are detected by the modified u-level method (with alignment on the ends of bursts), the uv-quadrant 2 method, and the uv-quadrant 4 method. The mean periods of bursts and sweeps are increased by suction. The regions upstream from u-level detected bursts are more coherent than the bursts themselves. Suction substantially increases the relative contributions from the organized motion to momentum and heat fluxes, uv, uθ, and vθ, and has a lesser effect on contributions to u 2, v2, and θ2. © 1990 American Institute of Physics.