Coherent structure of a turbulent boundary layer in a convected reference frame
Abstract
This is an interim annual report for an ongoing research program studying coherent structure in turbulent boundary layers. The design and development of a water channel facility for use in flow visualization studies of coherent turbulent boundary structure is described. The particularly unique aspects of this facility include the incorporation of (1) a moving reference (viewing) platform for study of relative motion effects and (2) a closed circuit television monitoring and recording system. Preliminary flow visualization results are presented for both a fixed and moving reference frame, and a tentative vortex-loop model of coherent turbulent boundary layer structure is proposed. Computer simulations of a transverse structure in a turbulent boundary layer are presented showing a remarkable similarity with experimental flow visualization results. Research directions for the following year are outlined.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- June 1977
- Bibcode:
- 1977STIN...7733448S
- Keywords:
-
- Flow Visualization;
- Turbulent Boundary Layer;
- Turbulent Flow;
- Coherence;
- Computerized Simulation;
- Fluid Mechanics;
- Hydraulic Test Tunnels;
- Fluid Mechanics and Heat Transfer