On the Peterlin approximation for turbulent flows of polymer solutions

D. Vincenzi, P. Perlekar, L. Biferale, F. Toschi

Research output: Book/ReportReportAcademic

Abstract

We study the impact of the Peterlin approximation on the statistics of the end-to-end separation of poly- mers in a turbulent flow. The FENE and FENE-P models are numerically integrated along a large number of Lagrangian trajectories resulting from a direct numerical simulation of three-dimensional homogeneous isotropic turbulence. Although the FENE-P model yields results in qualitative agreement with those of the FENE model, quantitative differences emerge. The steady-state probability of large extensions is overesti- mated by the FENE-P model. The alignment of polymers with the eigenvectors of the rate-of-strain tensor and with the direction of vorticity is weaker when the Peterlin approximation is used. At large Weissenberg numbers, both the correlation times of the extension and of the orientation of polymers are underestimated by the FENE-P model.
Original languageEnglish
Publishers.n.
Number of pages12
Publication statusPublished - 2015

Publication series

NamearXiv
Volume1505.06829 [physics.flu-dyn]

Fingerprint Dive into the research topics of 'On the Peterlin approximation for turbulent flows of polymer solutions'. Together they form a unique fingerprint.

  • Cite this

    Vincenzi, D., Perlekar, P., Biferale, L., & Toschi, F. (2015). On the Peterlin approximation for turbulent flows of polymer solutions. (arXiv; Vol. 1505.06829 [physics.flu-dyn]). s.n.