EFFECT OF FLOW IRREGULARITY ON OSCILLATORY BOUNDARY LAYER FLOW

Mahesa Bhawanin; Tom O'Donoghue; Dominic A van der A; Jan S. Ribberink

doi:10.9753/icce.v34.sediment.44

No. 34 (2014), Sediment Transport and Morphology

No. 34 (2014)

EFFECT OF FLOW IRREGULARITY ON OSCILLATORY BOUNDARY LAYER FLOW

Sediment Transport and Morphology

https://doi.org/10.9753/icce.v34.sediment.44

Published 2014-10-28

Mahesa Bhawanin⁺⁻
Tom O'Donoghue⁺⁻
Dominic A van der A⁺⁻
Jan S. Ribberink⁺⁻

Mahesa Bhawanin

University of Aberdeen

Tom O'Donoghue

University of Aberdeen

Dominic A van der A

University of Aberdeen

Jan S. Ribberink

University of Twente

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Keywords

oscillatory flow
boundary layer
turbulence
flow tunnel
laboratory experiments

How to Cite

Bhawanin, M., O’Donoghue, T., van der A, D. A., & Ribberink, J. S. (2014). EFFECT OF FLOW IRREGULARITY ON OSCILLATORY BOUNDARY LAYER FLOW. Coastal Engineering Proceedings, 1(34), sediment.44. https://doi.org/10.9753/icce.v34.sediment.44

Abstract

The paper reports on new oscillatory flow tunnel experiments in which detailed measurements have been made of boundary layer velocities for full-scale regular and irregular oscillatory flows over sand-rough and gravel-rough fixed beds. The irregular flows were generated by amplitude modulation of the corresponding regular flows, to give same free-stream urms and same velocity and acceleration skewness. The experimental setup is described and initial results relating to flow structure, turbulence and bed shear stress are presented. Results presented for boundary layer development, turbulence intensity, turbulent stress and log-law-based estimates of bed shear stress suggest that the hydrodynamics within a flow half-cycle are largely independent of the previous flow half-cycle, at least close to the bed where the presented results have focused. Time-history effects are not entirely absent however, especially higher up from the bed. More detailed analysis is needed to elucidate further.

https://doi.org/10.9753/icce.v34.sediment.44

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References

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van der A, D.A., O'Donoghue, T., Davies, A.G. and J.S. Ribberink. 2011. Experimental study of the turbulent boundary layer in acceleration-skewed oscillatory flow, J. Fluid Mechanics, 684, 251- 283.

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Authors retain copyright and grant the Proceedings right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this Proceedings.

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EFFECT OF FLOW IRREGULARITY ON OSCILLATORY BOUNDARY LAYER FLOW

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