Abstract
We periodically modulate a turbulent wind-tunnel flow with an active grid. We find a resonant enhancement of the mean turbulent dissipation rate at a modulation frequency which equals the large-eddy turnover rate. Thus, we find the best frequency to inject energy into a turbulent flow. The resonant response is characterized by the emergence of vortical structures in the flow and depends on the spatial mode of the stirring grid.
| Original language | English |
|---|---|
| Article number | 044503 |
| Pages (from-to) | 1/4- |
| Number of pages | 4 |
| Journal | Physical Review Letters |
| Volume | 105 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 2010 |