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VOLUMETRIC MEASUREMENTS BY TOMOGRAPHIC PIV OF GRID GENERATED TURBULENCE IN AN OPEN CHANNEL FLOW

Thomas A. Earl
School of Civil Engineering The University of Sydney Rm 478 Bldg J05, Shepherd St, The University of Sydney 2006, Australia

Lionel Thomas
Institut Pprime, CNRS. Universite de Poitiers. ENSMA. UPR 3346, Departement Fluides, Thermique, Combustion, Branche Fluides. Axe HydEE, SP2MI Teleport 2, Boulevard Marie et Pierre Curie. BP 30179, F86962 FUTUROSCOPE CHASSENEUIL Cedex

Steve Cochard
School of Civil Engineering The University of Sydney Rm 341 Bldg J05, Shepherd St, The University of Sydney 2006, Australia

Riadh Ben Salah
Institut XLIM-SIC, UPR3346 Universite de Poitiers Boulevard Marie et Pierre Curie, BP 30179, F86961 Futuroscope Chasseneuil, FRANCE

Benoit Tremblais
Institut XLIM-SIC, UPR3346 Universite de Poitiers Boulevard Marie et Pierre Curie, BP 30179, F86962 Futuroscope Chasseneuil, FRANCE

Laurent David
Institut PPRIME CNRS- Universitede Poitiers- ENSMA UPR 3346 Boulevard Marie et Pierre Curie 86962 Futuroscope Chasseneuil France

Abstract

This paper investigates the energy dissipation rate behind two combinations of trash racks (or meshes) in an open channel flow. Five trash rack assemblies divided the flume into four identical pools in the downstream direction. The global characteristics of the flow were compared with Tomo−PIV measurements that were taken in the water column of the flow. From the Tomo−PIV measurements, the instantaneous structures in the flow were visualised and the decay of turbulent kinetic energy and energy dissipation analysed.