Publicado 4 números por año
ISSN Imprimir: 1065-3090
ISSN En Línea: 1940-4336
Indexed in
ON IDENTIFICATION OF VORTICAL STRUCTURES IN TURBULENT SHEAR FLOW
SINOPSIS
In the present work, four criteria for vortex detection in turbulent flows are considered. Three of them involve the invariants of the velocity-gradient tensor and one involves the analysis of the Hessian of the pressure. The ability of the different methods in detecting vortical structures in wall-bounded flows hairpin vortices in particular is analyzed with the following procedure: i) the flow of a viscous incompressible fluid in a plane channel is simulated numerically with the use of a computational code for numerical integration of the Navier-Stokes equations, based on a mixed spectral-finite difference technique (the approach of the Direct Numerical Simulation is followed); ii) a turbulent-flow database, representing the turbulent statistically steady state of the velocity field through 10 viscous time units, is assembled; iii) all the vortex-identification techniques are applied to the database. It is shown that three of the methods considered give almost equivalent results in identifying hairpin-like vortical structures in the wall region of turbulent channel flow, while one of them gives slightly different results.
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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, Ciliberti Stefania, Mancini Marco, Primavera Leonardo, Direct Numerical Simulation of Turbulent Channel Flow on High-Performance GPU Computing System, Computation, 4, 1, 2016. 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
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Liu Kai, Zheng Lixing, Zhan Shiyuan, Simulation Investigation on the Flow and Mixing in Ducts of the Rotary Energy Recovery Device, Geofluids, 2020, 2020. Crossref
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Chen Po-chen, Tsai Wu-ting, Druzhinin Oleg, Troitskaya Yuliya, The study of a turbulent air flow over capillary–gravity water surface waves: Characteristics of coherent vortical structures, Ocean Modelling, 150, 2020. Crossref