TY - GEN
T1 - Turbulent solitary wave boundary layer
AU - Sumer, B. M.
AU - Jensen, P. M.
AU - Sørensen, L. B.
AU - Fredsøe, J.
AU - Liu, P. L.F.
PY - 2008
Y1 - 2008
N2 - This paper summarizes the results of an experimental investigation of turbulent solitary wave boundary layers. The wave induced flow has been simulated by a solitary motion in an oscillating tunnel. The experiments show that the boundary layer flow remains laminar for Re numbers smaller than Re=5×105. The experiments further show that the bed shear stress reverses during the deceleration stage of the freestream flow. In a narrow sub-range of Re number (2×105 < Re < 5×105) in the laminar regime, the boundary layer flow experiences a regular array of vortices near the bed over a short period of time during the deceleration stage. The transition-to-turbulence at Re=5×105 is associated with the emergence of turbulent spots, revealed by single/multiple, or, sometimes, quite dense spikes in the bed shear stress variations. Flow resistance in terms of wave friction coefficient including the phase information has also been worked out for both the acceleration and deceleration stages of the free-stream flow of the wave.
AB - This paper summarizes the results of an experimental investigation of turbulent solitary wave boundary layers. The wave induced flow has been simulated by a solitary motion in an oscillating tunnel. The experiments show that the boundary layer flow remains laminar for Re numbers smaller than Re=5×105. The experiments further show that the bed shear stress reverses during the deceleration stage of the freestream flow. In a narrow sub-range of Re number (2×105 < Re < 5×105) in the laminar regime, the boundary layer flow experiences a regular array of vortices near the bed over a short period of time during the deceleration stage. The transition-to-turbulence at Re=5×105 is associated with the emergence of turbulent spots, revealed by single/multiple, or, sometimes, quite dense spikes in the bed shear stress variations. Flow resistance in terms of wave friction coefficient including the phase information has also been worked out for both the acceleration and deceleration stages of the free-stream flow of the wave.
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M3 - Conference contribution
AN - SCOPUS:56049095628
SN - 9781880653708
T3 - Proceedings of the International Offshore and Polar Engineering Conference
SP - 775
EP - 781
BT - Proceedings of the 18th 2008 International Offshore and Polar Engineering Conference, ISOPE 2008
T2 - 18th 2008 International Offshore and Polar Engineering Conference, ISOPE 2008
Y2 - 6 July 2008 through 11 July 2008
ER -