### Abstract

Original language | English |
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Pages | - |

Number of pages | 4 |

Publication status | Published - 2006 |

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### Keywords

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

### Cite this

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

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**Turbulence modification by periodically modulated scale-depending forcing.** / Kuczaj, A.K.; Geurts, B.J.; Lohse, D.; van de Water, W.

Research output: Contribution to conference › Paper › Academic › peer-review

TY - CONF

T1 - Turbulence modification by periodically modulated scale-depending forcing

AU - Kuczaj, A.K.

AU - Geurts, B.J.

AU - Lohse, D.

AU - van de Water, W.

PY - 2006

Y1 - 2006

N2 - 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.

AB - 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.

KW - EWI-7521

KW - IR-63572

KW - METIS-236805

M3 - Paper

SP - -

ER -