Università degli Studi di Udine Dottorato di Ricerca in Scienze dell'Ingegneria Energetica e Ambientale Seminari del Corso di Dottorato – Settimana dottorale 2015 Turbulent compressible wall-bounded flows at high Reynolds number Prof. Sergio Pirozzoli Dipartimento di INGEGNERIA MECCANICA E AEROSPAZIALE Università di Roma “La Sapienza”, Roma (IT) Martedì 27 Gennaio 2015, ore 14.30 Sala Multimediale DIMI Abstract Turbulent wall-bounded flows at high Reynolds number (in the order of a few thousands, in terms of friction velocity) are studied in the compressible regime by means of large-scale direct numerical simulations. As in the low-speed regime, it is found that new phenomena of imprinting and modulation imparted by outer large eddies onto the near-wall ones become important, and imply increased near-wall intermittency. The study highlights the emergence of genuine high-Re effects as the formation of a genuine log layer in the mean velocity and wall-parallel velocity variances, and the onset of narrow Kolmogorov-like ranges in the velocity spectra far from the wall. The validity of the van Driest transformation, as well as compressible skin friction correlations is discussed. Guidelines for the correct numerical simulation of compressible wall-bounded flows are also given. CV Prof. Pirozzoli graduated with honors in Aeronautical Engineering at `La Sapienza' in 1996, where he got a PhD in Aerospace Engineering in 2000. He has been the recipient a `Marie Curie' fellowship on `Large Eddy Simulation of transonic flows' in 1998. He has been visiting researcher at CalTech in 2000 and 2001. From 2004 to 2010 he has been assistant professor in Fluid Dynamics, and he is Associate Professor since 2011. He has given several invited talks (at CalTech, Institut Leonard de Vinci, ICIAM Congress, Chinese Academy of Sciences, University of Southampton, TU Berlin, ENSAM Paris, Progress in Wall Turbulence Conf, IIT Mumbai), and a series of lectures at the Von Karman Institute. He serves as referee for several international scientific journals (including J. Fluid Mech., J. Comput. Phys., Phys. Fluids). He has authored 50 papers in international refereed journals, including a review on `Numerical Methods for High-Speed Flows' for Annu. Rev. Fluid Mech. He has been member of the executive fluid dynamics panel of the ECCOMAS from 2008 to 2012. He has been the recipient of three 50M CPU hours PRACE super-computing grants. }}