Three-dimensional structures in a shallow flow

A.R. Cieslik, L.P.J. Kamp, H.J.H. Clercx, G.J.F. Heijst, van

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Contrary to two-dimensional turbulence, decaying turbulence in a shallow fluid layer is characterized by the presence of long-lived meandering currents. This paper investigates the structure of vertical motion present inside the free-surface shallow-fluid layer and its relation with these currents. Downward motion is concentrated in thin elongated strain-dominated regions around instantaneous hyperbolic points and upward flow is observed in rotation-dominated patches around elliptic points. We show that the emergence of meandering currents results from inherent three-dimensionality of the flow due to the presence of the no-slip bottom. Our findings seriously question the assumption of quasi-two-dimensionality of shallow-fluid layer flows.
Original languageEnglish
Pages (from-to)89-101
Number of pages13
JournalJournal of Hydro-Environment Research
Issue number2
Publication statusPublished - 2010


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