Presenter/Author Information

Donatella Termini

Keywords

open channel flow, flow turbulence structure, burst cycle, walls roughness, laboratory experiments

Start Date

1-7-2012 12:00 AM

Description

Improvements on the understanding of coupling between the near-bedflow and the sediment transport are needed for the numerical simulation. In thepresent paper analyses are based on experimental work carried out in a straightchannel, constructed at the laboratory of the Dipartimento di Ingegneria Civile,Ambientale ed Aereonautica - Palermo’s University (Italy), for two differentroughness conditions of the side-walls. Detailed measures of flow velocity fieldhave been obtained through an acoustic velocimeter profile (DOP 2000). Theresults show that the flow is characterized by alternating high-low speed fluidregions which lead to the formation of turbulent coherent structures. Theconditioned quadrant analysis and the space-time correlations of the conditioneddata are applied to define the occurrence of turbulent events.

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Jul 1st, 12:00 AM

Turbulence structure and coherent motion in a straight laboratory flume

Improvements on the understanding of coupling between the near-bedflow and the sediment transport are needed for the numerical simulation. In thepresent paper analyses are based on experimental work carried out in a straightchannel, constructed at the laboratory of the Dipartimento di Ingegneria Civile,Ambientale ed Aereonautica - Palermo’s University (Italy), for two differentroughness conditions of the side-walls. Detailed measures of flow velocity fieldhave been obtained through an acoustic velocimeter profile (DOP 2000). Theresults show that the flow is characterized by alternating high-low speed fluidregions which lead to the formation of turbulent coherent structures. Theconditioned quadrant analysis and the space-time correlations of the conditioneddata are applied to define the occurrence of turbulent events.