Determining the shedding time of vortices in real-time

Abstract eng:
Coherent vortex structures are tracked in the simulated wake of a circular cylinder. Topological Lagrangian saddle points are identified as intersections of positive and negative finite-time Lyapunov exponent (FTLE) ridges, and these points are then followed as the flow evolves in order to track individual coherent structures. Previous studies of a circular cylinder in cross-flow have shown that the acceleration of Lagrangian saddle points away from the cylinder surface provides an objective method to detect vortex shedding. This saddle point acceleration is combined with the static pressure distribution on the circular cylinder to provide a clear, more easily measured indication of the shedding time of a vortex than comparable techniques such as force measurements.

• Export as: BibTeX | MARC | MARCXML | DC | EndNote | NLM | RefWorks
• Add to your basket