Keywords
open channel flow, flow turbulence structure, burst cycle, walls roughness, laboratory experiments
Start Date
1-7-2012 12:00 AM
Abstract
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.
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.
