Visualizing the very-large-scale motions in turbulent pipe flow
Abstract
Time-resolved stereoscopic particle image velocimetry is used to investigate the structure of the very-large-scale motions (VLSMs) in fully developed turbulent pipe flow. The motions are visualized using snapshot proper orthogonal decomposition. It is shown that the structures can be reconstructed using a small number of the most energetic modes. The results strongly suggest a possible connection between the origin of the VLSM and linear stability analysis. The structures are seen to be highly three-dimensional, meandering azimuthally and radially. At this Reynolds number (ReD=12 500), they occasionally extend from the near-wall region to the wake region of the pipe.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jan 01, 2011
- Source ID
- 10.1063/1.3533016
Entities
People
- Alexander Smits
- Aman Sinha
- Leo H. O. Hellström
Organizations
- Air Force Office of Scientific Research
- Office of Naval Research
- Princeton University