Response maxima in time-modulated turbulence: Direct Numerical Simulations

Details Response maxima in time-modulated turbulence: Direct Numerical Simulations Response maxima in time-modulated turbulence: Direct Numerical Simulations

2005-09-24

arxiv.org/abs/physics/0509208v1

Physics

Fluid Dynamics

submitted to Europhysics Letters (EPL), 8 pages, 8 Postscript figures, uses epl.cls

Scientific paper

10.1209/epl/i2005-10486-2

The response of turbulent flow to time-modulated forcing is studied by direct numerical simulations of the Navier-Stokes equations. The large-scale forcing is modulated via periodic energy input variations at frequency $\omega$. The response is maximal for frequencies in the range of the inverse of the large eddy turnover time, confirming the mean-field predictions of von der Heydt, Grossmann and Lohse (Phys. Rev. E 67, 046308 (2003)). In accordance with the theory the response maximum shows only a small dependence on the Reynolds number and is also quite insensitive to the particular flow-quantity that is monitored, e.g., kinetic energy, dissipation-rate, or Taylor-Reynolds number. At sufficiently high frequencies the amplitude of the kinetic energy response decreases as $1/\omega$. For frequencies beyond the range of maximal response, a significant change in phase-shift relative to the time-modulated forcing is observed.

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