Grid and subgrid-scale interactions in viscoelastic turbulent flow and implications for modeling

• Type: Article in International Scientific Journal
• Date: 2016

Authors

M. Masoudian (Author) FEUP; C. B. da Silva (Author) Other; F. T. Pinho (Author) FEUP

Journal

Title: Journal of Turbulence

Vol. 17 No. 6

Pages: 543-571

ISSN: 1468-5248

Publisher: Taylor & Francis

Indexing

ISI Web of Knowledge - 2 Citations

ISI Web of Science

Scopus

INSPEC

Associated Projects

LEPAE/CEFT - RL1 - Chemical Engineering: Process Optimization and Energy Conversion

TURBELAST - TURBELAST - Modelos de turbulência para fluídos viscoelásticos: abordagem RANS e LES

Other information

Authenticus ID: P-00K-FQT

DOI: 10.1080/14685248.2015.1125492

Abstract (EN): Using direct numerical simulations of turbulent plane channel flow of homogeneous polymer solutions, described by the Finitely Extensible Nonlinear Elastic-Peterlin (FENE-P) rheological constitutive model, a-priori analyses of the filtered momentum and FENE-P constitutive equations are performed. The influence of the polymer additives on the subgrid-scale (SGS) energy is evaluated by comparing the Newtonian and the viscoelastic flows, and a severe suppression of SGS stresses and energy is observed in the viscoelastic flow. All the terms of the transport equation of the SGS kinetic energy for FENE-P fluids are analysed, and an approximated version of this equation for use in future large eddy simulation closures is suggested. The terms responsible for kinetic energy transfer between grid-scale (GS) and SGS energy (split into forward/backward energy transfer) are evaluated in the presence of polymers. It is observed that the probability and intensity of forward scatter events tend to decrease in the presence of polymers

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 29