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 $\omega$. 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.
Item Type:Conference or Workshop Item
Electrical Engineering, Mathematics and Computer Science (EEMCS)
Science and Technology (TNW)
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