Stirring turbulence with turbulence

H.E. Cekli, R. Joosten, W. van de Water

Research output: Contribution to journalArticleAcademicpeer-review

8 Citations (Scopus)
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We stir wind-tunnel turbulence with an active grid that consists of rods with attached vanes. The time-varying angle of these rods is controlled by random numbers. We study the response of turbulence on the statistical properties of these random numbers. The random numbers are generated by the Gledzer-Ohkitani-Yamada shell model, which is a simple dynamical model of turbulence that produces a velocity field displaying inertial-range scaling behavior. The range of scales can be adjusted by selection of shells. We find that the largest energy input and the smallest anisotropy are reached when the time scale of the random numbers matches that of the largest eddies of the wind-tunnel turbulence. A large mismatch of these times creates a highly intermittent random flow with interesting but quite anomalous statistics.

Original languageEnglish
Article number125107
Number of pages10
JournalPhysics of Fluids
Issue number12
Publication statusPublished - 1 Dec 2015


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