Bottom Boundary Layer Under Standing Wave Groups: Eulerian Drift

Sánchez-Badorrey, Elena; Bramato, Simona; Mans, Christian; Losada, Miguel Á.; Cowen, Edwin A.

doi:10.1142/9789812709554_0188

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“…Depth distance between the perturbations located at M 1 and M 2 (in the inner BBL region) was of O ( δ ), whereas distance between perturbations at M 4 and M 5 (in the outer BBL region) was of O ( δ g ). Similar small‐amplitude perturbations of the wave group–induced steady streaming in the laminar regime were also observed by Sánchez‐Badorrey et al [2006] at different test locations in the wave flume.…”

Section: Steady Streaming Under Regular Wave Groups: Experimental Evisupporting

confidence: 77%

“…The time evolution of the instantaneous BBL velocities (horizontal and vertical) at the test location was measured simultaneously with a maximum vertical resolution of 0.1 mm near the bed. The reader is referred to Sánchez‐Badorrey et al [2006] and Bramato [2007] for a detailed description of the wave group experiments and the data analysis methodology. BBL Reynolds' number of the shortwave motion during the experiments is Re < 100.…”

Section: Steady Streaming Under Regular Wave Groups: Experimental Evimentioning

confidence: 99%

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High‐order oscillatory contributions to shear stress under standing regular wave groups: Theory and experimental evidence

et al. 2009

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[1] In this paper, the oscillatory contributions to the steady shear stress of regular wave groups propagating over plane beds in the laminar regime are investigated theoretically and experimentally. Assuming weak nonlinearity, it was found that weak-unsteady motions induced by regular wave groups and second-order harmonics induced by nonlinear bottom boundary layer (BBL) dynamics contribute to the same order. Wave reflection was found to be an additional mechanism to generate high-order contributions to the steady shear stress. High-order oscillatory contributions to the steady shear stress generate small-amplitude perturbations to the steady streaming through the BBL. As a result, steady secondary circulation cells can be distinguished in the wave group-induced BBL. The magnitude and length scale of the measured small-amplitude perturbations are consistent with the theoretical predictions. Moreover, it is shown that the oscillatory contributions are selected according to their characteristic timescale with distance to the bed. The results could have important implications for understanding BBL dynamics and transport and the transition to the perturbed laminar regime in multiple-scale oscillatory flows.Citation: Sánchez-Badorrey, E., C. Mans, S. Bramato, and M. A. Losada (2009), High-order oscillatory contributions to shear stress under standing regular wave groups: Theory and experimental evidence,

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Section: Steady Streaming Under Regular Wave Groups: Experimental Evisupporting

confidence: 77%

Section: Steady Streaming Under Regular Wave Groups: Experimental Evimentioning

confidence: 99%

High‐order oscillatory contributions to shear stress under standing regular wave groups: Theory and experimental evidence

et al. 2009

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Bottom Boundary Layer Under Standing Wave Groups: Eulerian Drift

Cited by 1 publication

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High‐order oscillatory contributions to shear stress under standing regular wave groups: Theory and experimental evidence

High‐order oscillatory contributions to shear stress under standing regular wave groups: Theory and experimental evidence

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