Quelques aspects de la turbulence en mécanique discrète

CALTAGIRONE, Jean-Paul; VINCENT, Stéphane

doi:10.21494/ISTE.OP.2019.0328

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CALTAGIRONE, Jean-Paul

VINCENT, Stéphane
Laboratoire Modélisation et Simulation Multi-Echelle [MSME]

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Thermodynamique des interfaces et mécanique des fluides. 2019, vol. 3, n° 1, p. 1-26

ISTE OpenScience

Resumen en inglés

The discrete mechanics formalism and equations are considered in the present work in order to establish the role played by representative motion equations on the study of turbulence in fluids. In particular, a set of differences related to the turbulent pressure, the dynamics of vorticity in two spatial dimensions, the turbulent dissipation or the divergence of acceleration are discussed compared to the classical continuous media and Navier-Stokes equations. A second part is devoted to presenting on a first example, the rigid rotational motion, the differences between discrete and continuum mechanics. A last section is devoted to simulating the turbulent channel flow at turbulent Reynolds number of Reτ = 590. It is demonstrated that discrete mechanics allow to recover accurately the mean velocity profiles of reference DNS and also to provide scale laws of the whole mean velocity profile from the wall to the center of the channel.< Leer menos

Palabras clave en inglés

Discrete Mechanics

Hodge-Helmholtz decomposition

Lamb vector

Turbulent channel flow

Law of the wall

Dynamics of the vorticity

Turbulent dissipation

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