Volume 58, Number 4, May 2002
|Page(s)||616 - 622|
|Section||Interdisciplinary physics and related areas of science and technology|
|Published online||01 May 2002|
Polymer dynamics in wall turbulent flow
Institut für Theoretische Physik, TU Berlin
Hardenbergstr. 36, D-10623 Berlin, Germany
2 Università La Sapienza, Dipartimento di Meccanica e Aeronautica Via Eudossiana 18, I-00184 Roma, Italy
3 Department of Materials, Institute of Polymers, ETH Zürich CH-8092 Zürich, Switzerland
4 Istituto per le Applicazioni del Calcolo “Mauro Picone”, CNR Viale Policlinico 137, I-00161 Roma, Italy
Accepted: 25 February 2002
The dynamics of dilute polymer solutions is investigated in wall turbulent flow. A realistic turbulent flow field is obtained by a fully coupled direct numerical simulation of a drag-reducing polymer solution. This flow field is used to compare the microscopic and macroscopic description of the polymer dynamics. It is observed that polymers become highly oriented parallel to the mean flow direction. The stretching of the polymers is characterized by a broad distribution of polymer extensions. Finally, the Gaussian manifold corresponding to the macroscopic description of the polymer dynamics is found to be unstable in the present flow.
PACS: 83.80.Rs – Polymer solutions / 05.20.Dd – Kinetic theory / 47.27.Eq – Turbulence simulation and modeling
© EDP Sciences, 2002
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