Turbulence modification by periodically modulated scale-depending forcing

Kuczaj, A.K. and Geurts, B.J. and Lohse, D. and van de Water, W. (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.

PDF
Restricted to UT campus only: Request a copy
190Kb

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
Faculty:	Electrical Engineering, Mathematics and Computer Science (EEMCS) Science and Technology (TNW)
Research Group:	Physics of Fluids (POF) Mathematics of Computational Science (MaCS)
Link to this item:	http://purl.utwente.nl/publications/63572
Export this item as:	BibTeX EndNote HTML Citation Reference Manager

Show download statistics for this publication

Repository Staff Only: item control page

Metis ID: 236805