### Abstract

The response of turbulent flow to time-modulated forcing is studied by direct numerical simulation of the Navier-Stokes equations. The forcing is modulated via periodic energy input variations at a frequency $\omega$. Such forcing of the large-scales is shown to yield a response maximum at frequencies in the range of the inverse of the large-eddy turnover time. Time-modulated broad-band forcing is also studied in which a wide spectrum of length-scales is forced simultaneously. If smaller length-scales are explicitly agitated by the forcing, the response maximum is found to occur at higher frequencies and to become less pronounced. In case the forced spectrum is sufficiently wide, a response maximum was not observed. At sufficiently high frequencies the amplitude of the kinetic energy response decreases as $1/ \omega$, consistent with theoretical predictions.

Original language | English |
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Pages | - |

Number of pages | 4 |

Publication status | Published - 2006 |

### Keywords

- EWI-7521
- IR-63572
- METIS-236805

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## Cite this

Kuczaj, A. K., Geurts, B. J., Lohse, D., & van de Water, W. (2006).

*Turbulence modification by periodically modulated scale-depending forcing*. -.