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Turbulent spots in oscillatory boundary layers

  • Marco Mazzuoli (a1), Giovanna Vittori (a1) and Paolo Blondeaux (a1)

Detailed knowledge of the dynamics of vortex structures in an oscillatory boundary layer is essential for the correct modelling of transport processes in many engineering problems and, in particular, of the pick-up and transport of sediments at the bottom of sea waves. In the present contribution, the formation of turbulent spots in an oscillatory boundary layer is investigated by means of direct numerical simulations. Two of the laboratory experiments of Carstensen, Sumer and Fredsøe are reproduced and, after a comparison of the numerical results with laboratory measurements, a detailed and quantitative characterization of the turbulent spots is also given on the basis of further simulations. The speeds of the head () and tail () of the spots are found to scale with the instantaneous free stream velocity and to be similar to those observed in steady boundary layers. The ratios and seem to increase with the Reynolds number () while the streamwise expansion rate of the spots appears to be independent of .

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4. A. G. Davies , J. S. Ribberinkb , A. Temperville & J. A. Zyserman 1997 Comparisons between sediment transport models and observations made in wave and current flows above plane beds. Coast. Engng 31, 163198.

5. H. Emmons 1951 Laminar-turbulent transition in boundary layer. J. Aeronaut. Sci. 18 (7), 490498.

6. L. S. Fishler & R. S. Brodkey 1991 Transition, turbulence and oscillating flow in a pipe. Exp. Fluids 11, 388398.

10. J. S. Ribberink & A. A. Al-Salem 1995 Sheet flow and suspension of sand in oscillatory boundary layers. Coast. Engng 25, 205225.

13. B. A. Singer 1996 Characteristics of a young turbulent spot. Phys. Fluids 8 (2), 509521.

14. G. Vittori 2003 Sediment suspension due to waves. J. Geophys. Res. 108 (6), 3173.

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Journal of Fluid Mechanics
  • ISSN: 0022-1120
  • EISSN: 1469-7645
  • URL: /core/journals/journal-of-fluid-mechanics
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