Spectra of velocity derivatives in a turbulent wake

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Abstract
One‐dimensional spectra have been measured in the self‐preserving wake of a circular cylinder for each of the nine major velocity derivatives that feature in the average dissipation of turbulent kinetic energy. The comparison between measured spectra and isotropic calculations indicates that isotropy is approached only at high wavenumbers, especially for spectra of derivatives with respect to lateral directions of lateral velocity fluctuations. This result is discussed in the context of the organized large scale motion.