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The present study reports the occurrence of a new recirculation structure taking place in the lateral branch of a 90° bifurcation flow. This recirculation structure is "helix-shaped" and strongly differs from the typical "closed" recirculation often reported in the literature. The aim of the study is to detail their characteristics using experimental and numerical approaches and to establish a typology, i.e. the flow conditions leading to each recirculation structure based on the upstream Froude number and the upstream aspect ratio.

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