Abstract
Coherent structures are tracked in three simulations of massive-separated or turbulent flow. Topological saddle points are found using intersections of the postiveand negative-time Lagrangian coherent structures, and these points are then followed as the flow evolves in order to track individual structures. In the cases of a 2D flat plate undergoing a 45° pitch-up maneuver and a circular cylinder in cross-flow, tracking saddle points showed a rapid acceleration of the structure as it shed from the plate or cylinder surface. For a simulation of wall-bounded turbulence in a channel flow, tracking the LCS saddle points shows that average structure convection speed exhibits a similar trend as a function of wall-normal distance as the mean velocity profile.
| Original language | English (US) |
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| Title of host publication | 9th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2015 |
| Publisher | TSFP-9 |
| ISBN (Electronic) | 9780000000002 |
| State | Published - 2015 |
| Externally published | Yes |
| Event | 9th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2015 - Melbourne, Australia Duration: Jun 30 2015 → Jul 3 2015 |
Publication series
| Name | 9th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2015 |
|---|---|
| Volume | 1 |
Other
| Other | 9th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2015 |
|---|---|
| Country/Territory | Australia |
| City | Melbourne |
| Period | 6/30/15 → 7/3/15 |
Bibliographical note
Funding Information:This work was supported by the Air Force Office of ScientificResearchunderAFOSRAwardNo. FA9550-14-