Abstract
Recent experimental evidence in turbulent wall flows shows that hairpin vortices occur in groups and propagate streamwise with relatively little dispersion. These groups, or “packets”, grow outward from the buffer layer to more than one-half of the thickness of the boundary layer. As the older packets grow in size, newer packets are generated near the wall to form a hierarchy of hairpin packets. Direct numerical simulations starting from a single hairpin vortex in a clean unidirectional turbulent mean flow background show how these packets may be formed in the near wall region by a viscous autogeneration mechanism that is similar in many regards to the mechanism proposed by Smith and co-workers [1]. The organization of hairpin vortices into packets and the interactions of those packets is an important feature of wall turbulence that provides a new paradigm by which many seemingly unconnected aspects of wall turbulence can be explained.
| Original language | English (US) |
|---|---|
| Title of host publication | 29th AIAA Fluid Dynamics Conference |
| Publisher | American Institute of Aeronautics and Astronautics Inc. |
| Pages | 1-13 |
| Number of pages | 13 |
| ISBN (Print) | 9780000000002 |
| DOIs | |
| State | Published - 1998 |
| Externally published | Yes |
| Event | 29th AIAA Fluid Dynamics Conference - Albuquerque, United States Duration: Jun 15 1998 → Jun 18 1998 |
Other
| Other | 29th AIAA Fluid Dynamics Conference |
|---|---|
| Country/Territory | United States |
| City | Albuquerque |
| Period | 6/15/98 → 6/18/98 |
ASJC Scopus subject areas
- Engineering (miscellaneous)
- Aerospace Engineering