Relevant terms for large-eddy simulations of viscoelastic isotropic turbulence

• Type: Article in International Conference Proceedings Book
• Date: 2020

Authors

Mósca, AC (Author) Other; da Silva, CB (Author) Other; F. T. Pinho (Author) FEUP; Valente, PC (Author) Other

Conference proceedings International

Title: ETC 2013 - 14th European Turbulence Conference

14th European Turbulence Conference, ETC 2013

1 September 2013 through 4 September 2013

Indexing

Scopus - 0 Citations

Other information

Authenticus ID: P-00R-VQ2

Abstract (EN): Direct numerical simulations of isotropic turbulence with polymer additives are used to analyse the relevant terms for large-eddy simulations (LES) of turbulent flows with polymer solutions, the rheology of which is described by the finitely extensible nonlinear elastic-Peterlin (FENE-P) model for polymers. Equations for the evolution of the kinetic energy and subgrid-scale kinetic energy are derived including the effects of polymer additives, where the grid and subgrid-scales of motion are defined through the application of a box filter. With this decomposition it is possible to isolate the effects of the (i) 'classical' energy cascade, (ii) grid/subgrid-scale interactions induced by the polymer, and (iii) the subgrid-scale/polymer interactions. The energy transfer between GS and SGS induced by the polymer is predominantly to the SGS, even if there are important contributions from inverse cascade, as in the classical (Newtonian) GS/SGS energy transfer. The results show that the energy transfer between GS/SGS and the energy transfer between the SGS/polymer are strongly correlated with the (Newtonian) viscous dissipation. The results suggest that SGS closures could be developed for viscoelastic turbulence based on a transport equation for the SGS kinetic energy. Copyright

Language: English

Type (Professor's evaluation): Scientific