Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Nonlinear eddy viscosity models for viscoelastic turbulence
Submission Author:
Angela Nieckele , RJ
Co-Authors:
Roney Thompson, Gilmar MOMPEAN, Angela Nieckele
Presenter: Angela Nieckele
doi://10.26678/ABCM.COBEM2017.COB17-1033
Abstract
Viscoelastic turbulence is an important area of research that has phenomenological, as well as practical motivations for the study. In the present work we use tensorial projections of a DNS database of the turbulent flow of a viscoelastic fluid in order to find the corresponding coefficients of a nonlinear eddy viscosity model, i.e. a model that consists of a tensor basis that encompasses a set of mean kinematic tensors beyond the mean rate-of-strain tensor. One important finding is that, as elasticity increases, the Boussinesq hypothesis decreases its capability to capture the Reynolds stress tensor.
Keywords
Viscoelastic turbulence, Nonlinear eddy viscosity models, DNS, Reynolds average, Tensorial decompositions
