%0 Journal Article
%A Alfonsi, Giancarlo
%A Ciliberti, Stefania A.
%A Mancini, Marco
%A Primavera, Leonardo
%D 2012
%I Begell House
%K direct numerical simulation of turbulence, swirling-strength criterion for vortex extraction, hairpin vortices, ejection/sweep turbulent events
%N 2
%P 139-160
%R 10.1615/JFlowVisImageProc.2012006261
%T TURBULENT EVENTS IN A WALL-BOUNDED TURBULENT FLOW
%U http://dl.begellhouse.com/journals/52b74bd3689ab10b,5c6422f23bae9627,5433038035cbeeb5.html
%V 19
%X The interaction between vortical structures and turbulent events in the wall region of a turbulent channel flow is investigated numerically. The system of the incompressible Navier-Stokes equations is integrated by using a mixed spectral finite-difference numerical technique, following the procedure of direct numerical simulation (DNS) of turbulence. The value of the Reynolds number based on the wall-shear velocity and channel half-height is *Re*_{τ} = 200. A specially assembled computing machine is used for calculations, including one Intel i7 quad-core processor and one Nvidia C-1060 Tesla device programmed using the CUDA paradigm. The swirling-strength criterion (or the λ_{ci} criterion) for vortex extraction is applied to the fluctuating portion of the computed velocity field, and the process of interaction of hairpin vortices and turbulent ejection- and sweep events is confirmed.
%8 2013-02-12