# Turbulence modification by periodically modulated scale-depending forcing

Kuczaj, A.K.
and
Geurts, B.J.
and
Lohse, D.
and
Water, W. van de
(2006)
*Turbulence modification by periodically modulated scale-depending forcing.*
In: Proceedings of Conference on Turbulence and Interactions (TI2006), 29 May - 02 June 2006, Porquerolles, France.

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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 . 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 , consistent with theoretical predictions. |

Item Type: | Conference or Workshop Item |

Faculty: | Electrical Engineering, Mathematics and Computer Science (EEMCS) Science and Technology (TNW) |

Research Group: | |

Link to this item: | http://purl.utwente.nl/publications/63572 |

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