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The flow around a circular cylinder has been examined over the Reynolds number range 10 5 to 7·5 × 10 5 , Reynolds number being based on cylinder diameter. Narrow-band vortex shedding has been observed up to a Reynolds number of 5·5 × 10 5 , i.e. well into the critical régime. At this Reynolds number the Strouhal number reached the unusually high value of 0·46. Spectra of the velocity fluctuations measured in the wake are presented for several values of Reynolds number.
Peter Bearman (1969) studied this question.