Three-dimensional structures in a shallow flow


Cieslik, A.R. and Kamp, L.P.J. and Clercx, H.J.H. and Heijst, G.J.F. van (2010) Three-dimensional structures in a shallow flow. Journal of Hydro-Environment Research, 4 (2). pp. 89-101. ISSN 1570-6443

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Abstract: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.
Item Type:Article
Additional information:One of the authors (A.R.C.) gratefully acknowledges the financial support from the Dutch Foundation for Fundamental Research on Matter (FOM).
Copyright:© 2010 Elsevier
Electrical Engineering, Mathematics and Computer Science (EEMCS)
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