The impact of a local perturbation on global properties of a turbulent wake
Abstract
Stationary perturbation techniques are used to investigate the sensitivity of the global properties of
the wake behind a bluff body at moderate Re. The entire recirculation bubble is found to be a
sensitive region for the global frequency selection and the quality of the synchronization. A striking
position is found at its center where synchronization is destroyed and the frequency is increased.
High speed particle image velocimetry sheds some light into the underlying mechanisms, which are
interpreted in terms of vorticity interaction, flow reattachment, and flow deviation. Strong mean
flow modifications are observed to correspond to drastic changes in drag and its fluctuations
Origin : Files produced by the author(s)
Loading...