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

Published online by Cambridge University Press:  08 March 2010

B. MUTLU SUMER ,
PALLE M. JENSEN ,
LONE B. SØRENSEN ,
JØRGEN FREDSØE ,
PHILIP L.-F. LIU  and
STEFAN CARSTENSEN
B. MUTLU SUMER*
Affiliation:
Technical University of Denmark, DTU Mekanik, Section of Coastal, Maritime and Structural Engineering, Building 403, 2800 Kgs. Lyngby, Denmark
PALLE M. JENSEN
Affiliation:
Technical University of Denmark, DTU Mekanik, Section of Coastal, Maritime and Structural Engineering, Building 403, 2800 Kgs. Lyngby, Denmark
LONE B. SØRENSEN
Affiliation:
Technical University of Denmark, DTU Mekanik, Section of Coastal, Maritime and Structural Engineering, Building 403, 2800 Kgs. Lyngby, Denmark
JØRGEN FREDSØE
Affiliation:
Technical University of Denmark, DTU Mekanik, Section of Coastal, Maritime and Structural Engineering, Building 403, 2800 Kgs. Lyngby, Denmark
PHILIP L.-F. LIU
Affiliation:
School of Civil and Environmental Engineering, Cornell University, Ithaca, NY 14853, USA
STEFAN CARSTENSEN
Affiliation:
Technical University of Denmark, DTU Mekanik, Section of Coastal, Maritime and Structural Engineering, Building 403, 2800 Kgs. Lyngby, Denmark
*
†Email address for correspondence: bms@mek.dtu.dk
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Abstract

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.

JFM classification

Boundary Layers: Boundary layer stability Turbulent Flows: Turbulent transition
Type
Papers
Information
Journal of Fluid Mechanics , Volume 646 , 10 March 2010 , pp. 207 - 231
Copyright
Copyright © Cambridge University Press 2010

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Footnotes

‡

Present address: DHI, Agern Alle 5, 2970 Hørsholm, Denmark.

References

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Sumer et al. supplementary movie 1

Movie 1. (Fig. 7) Video illustrating the vortex tubes in plan view. U0m= 50.9cm/s, T = 9.3s, Re = 3.8×105. ωt = -33 to 122 degrees. Free-stream flow from left to right.

Download Sumer et al. supplementary movie 1(Video)
Video 1.2 MB

Sumer et al. supplementary movie 2

Movie 2. (Fig. 8) Video illustrating the vortex tubes in side view. U0m= 43.9cm/s, T = 9.2s, Re = 2.8×105. ωt = 37 to 131 degrees. Free-stream flow from left to right.

Download Sumer et al. supplementary movie 2(Video)
Video 194.6 KB

Sumer et al. supplementary movie 3

Movie 3. (Fig. 11) Video illustrating turbulent spots in plan view. U0m = 93.9cm/s, T = 7.8s, Re = 1.1×106. ωt = -100 to 84 degrees. Free-stream flow from left to right.

Download Sumer et al. supplementary movie 3(Video)
Video 815.2 KB