Publicado 4 números por año
ISSN Imprimir: 1065-3090
ISSN En Línea: 1940-4336
Indexed in
TURBULENT EVENTS IN A WALL-BOUNDED TURBULENT FLOW
SINOPSIS
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 Reτ = 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 λci 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.
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Alfonsi Giancarlo, Ciliberti Stefania A., Mancini Marco, Primavera Leonardo, GPGPU implementation of mixed spectral-finite difference computational code for the numerical integration of the three-dimensional time-dependent incompressible Navier–Stokes equations, Computers & Fluids, 102, 2014. Crossref
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Alfonsi Giancarlo, Lauria Agostino, Primavera Leonardo, The Field of Flow Structures Generated by a Wave of Viscous Fluid Around Vertical Circular Cylinder Piercing the Free Surface, Procedia Engineering, 116, 2015. Crossref
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Alfonsi Giancarlo, Numerical Simulations of Wave-Induced Flow Fields around Large-Diameter Surface-Piercing Vertical Circular Cylinder, Computation, 3, 3, 2015. Crossref
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Alfonsi Giancarlo, Lauria Agostino, Primavera Leonardo, Recent Results from Analysis of Flow Structures and Energy Modes Induced by Viscous Wave around a Surface-Piercing Cylinder, Mathematical Problems in Engineering, 2017, 2017. Crossref