Impact of the Peterlin approximation on polymer dynamics in turbulent flows
- Others:
- Laboratoire Jean Alexandre Dieudonné (JAD) ; Université Nice Sophia Antipolis (1965 - 2019) (UNS) ; COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA)
- Università degli Studi di Roma Tor Vergata [Roma]
- Technische Universiteit Eindhoven ; Technische Universiteit Eindhoven (TU/e)
- Foundation for Fundamental Research on Matter (FOM), Netherlands Organisation for Scientific Research (NWO)
- Indo-French Centre for Applied Mathematics (IFCAM)
Description
We study the impact of the Peterlin approximation on the statistics of the end-to-end separation of polymers in a turbulent flow. The finitely extensible nonlinear elastic (FENE) model and the FENE model with the Peterlin approximation (FENE-P) 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 overestimated 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, the correlation times of both the extension and of the orientation of polymers are underestimated by the FENE-P model.
Abstract
International audience
Additional details
- URL
- https://hal.science/hal-01227997
- URN
- urn:oai:HAL:hal-01227997v1
- Origin repository
- UNICA