Active control effectiveness and synchronization of wall turbulence under localized imposed unsteadiness | Zendy

Sedat F. Tardu | Zendy; Olivier Doche | Zendy

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Active control effectiveness and synchronization of wall turbulence under localized imposed unsteadiness

Author(s) -

Sedat F. Tardu,

Olivier Doche

Publication year - 2007

Publication title -

physics of fluids

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.188

H-Index - 180

eISSN - 1089-7666

pISSN - 1070-6631

DOI - 10.1063/1.2793157

Subject(s) - physics , turbulence , perturbation (astronomy) , mechanics , drag , k epsilon turbulence model , classical mechanics , k omega turbulence model , synchronization (alternating current) , channel (broadcasting) , quantum mechanics , electrical engineering , engineering

International audienceThe effect of a spatially localized time-periodic perturbation on the efficiency of suboptimal control of the wall turbulence is analyzed. It is shown that the imposed unsteadiness with a frequency in the median production range doubles the turbulent drag reduction under suboptimal control strategy. It is further observed that the spatially averaged turbulent wall shear is synchronized in time with the imposed perturbation waveform. This is related to the synchronization of the unstable periodic orbits present in the near-wall turbulence in connection with the regeneration cycle of turbulence producing coherent structures

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