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  • Journal of Fluid Mechanics, Volume 646
  • March 2010, pp. 207-231

Coherent structures in wave boundary layers. Part 2. Solitary motion

  • DOI:
  • Published online: 08 March 2010

This study continues the investigation of wave boundary layers reported by Carstensen, Sumer & Fredsøe (J. Fluid Mech., 2010, part 1 of this paper). The present paper summarizes the results of an experimental investigation of turbulent solitary wave boundary layers, simulated by solitary motion in an oscillating water tunnel. Two kinds of measurements were made: bed shear stress measurements and velocity measurements. The experiments show that the solitary-motion boundary layer experiences three kinds of flow regimes as the Reynolds number is increased: (i) laminar regime; (ii) laminar regime where the boundary-layer flow experiences a regular array of vortex tubes near the bed over a short period of time during the deceleration stage; and (iii) transitional regime characterized with turbulent spots, revealed by single/multiple, or, sometimes, quite dense spikes in the bed shear stress traces. Supplementary synchronized flow visualization tests confirmed the presence of the previously mentioned flow features. Information related to flow resistance are also given in the paper.

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J. Fredsøe & R. Deigaard 1992 Mechanics of Coastal Sediment Transport. World Scientific.

J. Fredsøe , B. M. Sumer , A. Kozakiewicz , L. H. C. Chua & R. Deigaard 2003 Effect of externally generated turbulence on wave boundary layer. Coastal Engng 49, 155183.

G. H. Keulegan 1948 Gradual damping of solitary wave. J. Res. Natl. Bur. Stand. 40, 607614.

P. L.-F. Liu 2006 Turbulent boundary-layer effects on transient wave propagation in shallow water. Proc. Roy. Soc. A 462, 34313491.

B. M. Sumer , B. L. Jensen & J. Fredsøe 1987 Turbulence in oscillatory boundary layers. In Advances in Turbulence (ed. Gt. Comte-Bello & J. Mathieu ), pp. 556567. Springer.

H. Tanaka , B. M. Sumer & C. Lodahl 1998 Theoretical and experimental investigation on laminar boundary layers under cnoidal wave motion. Coastal Engng J. 40 (1), 8198.

E. R. van Driest 1956 On turbulent flow near a wall. J. Aeronaut. Sci. 23, 10071011.

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Journal of Fluid Mechanics
  • ISSN: 0022-1120
  • EISSN: 1469-7645
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