Propagating structures in wall-bounded turbulent flows
Abstract
The use of empirical eigenfunctions (determined by the Karhunen-Loeve procedure or proper orthogonal decomposition) in the analysis of turbulent channel flows has revealed the presence of propagation plane waves in the turbulent flows. These wave appear to play an essential role in the local production of turbulent via bursting or sweeping events in the turbulent boundary layer. In this paper, the initial analysis of a relatively coarse resolution, low Reynolds number turbulent flow with Re(tau) = 80 is extended to a higher resolution, fully developed turbulent flow with Re(tau) = 125. Similar results are obtained from each analysis, despite the marked differences between the two flows. This is suggestive of the existence of universal or near-universal features in the turbulent boundary layer, and demonstrates the usefulness of the empirical eigenfunctions in the analysis of turbulent flows.
- Publication:
-
12th Symposium on Turbulence
- Pub Date:
- 1990
- Bibcode:
- 1990turb.symp....9B
- Keywords:
-
- Channel Flow;
- Flow Velocity;
- Turbulent Boundary Layer;
- Wall Flow;
- Wave Propagation;
- Computerized Simulation;
- Flow Geometry;
- Karhunen-Loeve Expansion;
- Low Reynolds Number;
- Plane Waves;
- Fluid Mechanics and Heat Transfer