Laboratoire de Mécanique des Fluides et d'Acoustique - UMR 5509

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Accueil > Équipes > Fluides Complexes et Transferts > Séminaires du groupe

Turbulence Properties of Smooth-Bed Open-Channel Flows with and without Collinear Gravity Waves.

09/12/2021 -13h@B11-H10-ECL - Cosimo Peruzzi

Abstract : Among the various coherent structures that populate wall-bounded flows, Large- and Very-Large-Scale Motions (LSMs and VLSMs) are attracting significant scientific interest, not only from a merely academic perspective but also for their practical implications. Although dynamics and evolution of LSMs and VLSMs have been investigated in so-called canonical wall-flows (i.e. boundary layer, pipe and closed-channel flow), what happens to them in open-channel flows has been overlooked so far. In order to investigate the scaling of such large scale structures, novel experiments were carried out at the Giorgio Bidone Hydraulic Laboratory (Politecnico di Torino) where turbulent open-channel flows could be generated in a large-scale flume facility with and without the presence of collinear waves. The idea of perturbing open-channel flows with waves steams from the fact that waves and currents coexist in many environments and hence their interaction is relevant for many of the previously mentioned engineering applications. Moreover, gravity waves can be interpreted as perturbations whose effects can clarify issues related to turbulence in more canonical (i.e. without waves) open-channel flows. Longitudinal and vertical velocity components were measured at a high sampling frequency using a 2D Laser Doppler Anemometer (LDA).

Short bibliography : Cosimo Peruzzi is a Post-Doctoral Researcher at the LMFA, complex fluids and transfers group, and his research interests are connected to Environmental Fluid Mechanics, Turbulence and Mass Transport Phenomena. He obtained a Bachelor and Master Degree in Environmental Engineering from the University of Florence and, after, a PhD in Civil and Environmental Engineering at the Politecnico di Torino. In the PhD research, he experimentally studied turbulent coherent structures in open-channel flows with and without the presence of surface waves. After that, he spent one year of post-doctoral research at the University of Milan dealing with more-related environmental subjects (dispersion of pollutants in rural channels, nature-based solutions, water quality).