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Flow Structure Over a Simulated Bed for Costal Cohesive Sediment Erosion Studies

[+] Author Affiliations
Senhorinha F. C. Teixeira, José C. Teixeira

University of Minho, Guimarães, Portugal

Maria Amélia Araújo

Technical University of Lisbon, Lisboa, Portugal

Paper No. FEDSM2013-16243, pp. V01CT18A005; 8 pages
doi:10.1115/FEDSM2013-16243
From:
  • ASME 2013 Fluids Engineering Division Summer Meeting
  • Volume 1C, Symposia: Gas-Liquid Two-Phase Flows; Industrial and Environmental Applications of Fluid Mechanics; Issues and Perspectives in Automotive Flows; Liquid-Solids Flows; Multiscale Methods for Multiphase Flow; Noninvasive Measurements in Single and Multiphase Flows; Numerical Methods for Multiphase Flow; Transport Phenomena in Energy Conversion From Clean and Sustainable Resources; Transport Phenomena in Materials Processing and Manufacturing Processes; Transport Phenomena in Mixing; Turbulent Flows: Issues and Perspectives
  • Incline Village, Nevada, USA, July 7–11, 2013
  • Conference Sponsors: Fluids Engineering Division
  • ISBN: 978-0-7918-5556-0
  • Copyright © 2013 by ASME

abstract

This paper reports an experimental assessment of various alternatives to construct an artificial bed appropriate to duplicate, in laboratory, the conditions relevant to marine sediment erosion. The main goal of the study is to find a simulated bed that approaches the behavior of natural sediments, based on the velocity and turbulence profiles and on the interface shear stress values. For that purpose, experiments on natural sediments collected in two estuaries and on a variety of artificial beds were carried out in a circular mini flume, 131 mm in diameter. Velocity profiles and turbulence data were taken by means of a two-component LDA system at a Reynolds number of 20,000. For artificial sediments both rigid and deformable (either fluid or grain) surfaces were investigated. The results show that bed deformation plays an important role in controlling shear stress. The use of two liquid layers simulated bed does not appear to be an appropriate option due to the very high deformation at the interface of the layers. Rigid surfaces that replicate sediment morphology may be appropriate for the simulation of highly cohesive sediments. Turbulence structure proved to be a wall driven phenomenon, except for very dense dispersed flows.

Copyright © 2013 by ASME

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