Turbulent compressible wall-bounded flows at high Reynolds number

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
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.