179 citations · 578 across the 13 of their papers we have counts for
13 papers
Natural grid stretching for DNS of wall-bounded flows
Sergio Pirozzoli, Paolo Orlandi
We propose a natural stretching function for DNS of wall-bounded flows, which blends uniform near-wall spacing with uniform resolution in terms of Kolmogorov units in the outer wal…
One-point statistics for turbulent pipe flow up to
Sergio Pirozzoli, Joshua Romero, Massimiliano Fatica +2
We study turbulent flows in a smooth straight pipe of circular cross--section up to using direct--numerical-simulation (DNS) of the Navier--Stokes equations. Th…
The three-dimensional instabilities and destruction of the Hill's vortex
Paolo Orlandi
The Hill vortex is a three-dimensional vortex structure solution of the Euler equations. For small amplitude axisymmetric disturbances on the external surface from the linear stabi…
DNS of transitional and turbulent flows in rectangular ducts
Paolo Orlandi, Sergio Pirozzoli
We carry out Direct Numerical Simulation (DNS) of flows in closed rectangular ducts with several aspect ratios. The Navier-Stokes equations are discretized through a second-order f…
Turbulent kinetic energy production and Turbulent kinetic energy production and flow structures in flows past smooth and rough walls
Paolo Orlandi
Data available in literature from direct numerical simulations of two-dimensional turbulent channels by Lee & Moser (2015), Bernardini et al. (2014), Yamamoto and Tsuji (2018) and…
Comparison between super-hydrophobic, liquid infused and rough surfaces: a DNS study
I. Arenas, E. Garcia, M. K. Fu +3
Direct Numerical Simulations of two superposed fluids in a channel with a textured surface on the lower wall have been carried out. A parametric study varying the viscosity ratio b…
On the role of secondary motions in turbulent square duct flow
Davide Modesti, Sergio Pirozzoli, Paolo Orlandi +1
We use a direct numerical simulations (DNS) database for turbulent flow in a square duct up to bulk Reynolds number $\Rey_b=40000$, to quantitatively analyze the role of secondary…
Turbulence and secondary motions in square duct flow
S. Pirozzoli, D. Modesti, P. Orlandi +1
We study turbulent flows in pressure-driven ducts with square cross-section through direct numerical simulation in a wide enough range of Reynolds number to reach flow conditions w…
Transitional natural convection with conjugate heat transfer over smooth and rough walls
Paolo Orlandi, Sergio Pirozzoli
We study turbulent natural convection in enclosures with conjugate heat transfer. The simplest way to increase the heat transfer in this flow is through rough surfaces. In numerica…
Mixed convection in turbulent channels with unstable stratification
Sergio Pirozzoli, Matteo Bernardini, Roberto Verzicco +1
We study turbulent flows in planar channels with unstable thermal stratification, using direct numerical simulations in a wide range of Reynolds and Rayleigh numbers and reaching f…
Inertial waves and mean velocity profiles in a rotating pipe and a circular annulus with axial flow
Yantao Yang, Rodolfo Ostilla-Mónico, J. Z. Wu +1
In this paper we solve the inviscid inertial wave solutions in a circular pipe or annulus rotating constantly about its axis with moderate angular speed. The solutions are construc…
Dynamics of the free jets from nozzles of complex geometries
Paolo D'Addio, Paolo Orlandi
The dynamics of the coherent structures in jets generated by nozzles of different shapes is analyzed through DNS at , by considering circular, square, fractal and sta…
DNS of laminar-turbulent boundary layer transition induced by solid obstacles
Paolo Orlandi, Sergio Pirozzoli, Matteo Bernardini
Results of numerical simulations obtained by a staggered finite difference scheme together with an efficient immersed boundary method are presented to understand the effects of the…