2MSME - Laboratoire Modélisation et Simulation Multi-Echelle (Université Gustave Eiffel, 5 Bd Descartes, 77454 Marne-la-Vallée, Cedex 2
Université Paris-Est Créteil Val de Marne (UPEC) Faculté des Sciences et Technologie - Equipe de Biomécanique
61 avenue du général de Gaulle 94010 Créteil Cedex - France)
Abstract : 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.
https://hal-upec-upem.archives-ouvertes.fr/hal-02657362 Contributor : Stéphane VincentConnect in order to contact the contributor Submitted on : Saturday, May 30, 2020 - 10:34:26 AM Last modification on : Friday, August 5, 2022 - 2:54:00 PM
Jean-Paul Caltagirone, Stéphane Vincent. Some aspects of turbulence in discrete mechanics. Thermodynamique des interfaces et mécanique des fluides, ISTE OpenScience, 2019, 3 (1), pp.1-26. ⟨10.21494/ISTE.OP.2019.0328⟩. ⟨hal-02657362⟩