Investigation of the dynamics of a turbulent wall boundary layer by introduction of a small external perturbation
Abstract
A two-dimensional turbulent channel flow was perturbed by oscillations of one of the walls in direction of the mean flow. The response of the u-component was analysed in order to follow the path of the external disturbance through the structure of the turbulent velocity field. Differences between time of response of various turbulent quantities (wavenumber components of normal stress, shear stress, rate of bursting) are much larger than the corresponding differences across the buffer layer. The amplitude of the response is unexpectedly high in some cases. Implications of these findings are discussed.
- Publication:
-
5th Symposium on Turbulent Shear Flows
- Pub Date:
- 1985
- Bibcode:
- 1985stsf.proc...18R
- Keywords:
-
- Channel Flow;
- Flow Measurement;
- Fluid Dynamics;
- Oscillating Flow;
- Turbulent Boundary Layer;
- Wall Flow;
- Shear Stress;
- Time Lag;
- Two Dimensional Flow;
- Velocity Distribution;
- Fluid Mechanics and Heat Transfer