The present work focuses on a turbulent flow\ud with separated boundary layers in a rotor-stator system opened to the atmosphere at the\ud periphery, where the pre-swirl ratio of the fluid is low. Under these conditions, the\ud fluid in the core does not always rotate as a solid body, as expected by the solution of\ud Batchelor (1951). The experimental, theoretical and numerical results clearly explain\ud this phenomenon.
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