Topical Problems of Fluid Mechanics


Institute of Thermomechanics AS CR, v.v.i.	CTU in Prague Faculty of Mech. Engineering Dept. Tech. Mathematics	MIO Université du Sud Toulon Var - AMU - CNRS - IRD	Czech Pilot centre ERCOFTAC

Simulations of Viscoelastic Fluids Flows Using a Modified Log-Conformation Reformulation
O. Winter, T. Bodnár
Abstract:
The modiffed (non-singular) log-conformation reformulation proposed by Saramito [14] has been implemented in the finite-volume CFD toolbox OpenFOAM. An advantage of the possibility of using the modified reformulation over the original (singular) reformulation proposed by Fattal & Kupferman [7] at low Weissenberg numbers has been investigated. It was shown that in the case of regularized lid-driven cavity flow the original reformulation has a lower limit for the Weissenberg number. Below this limit the solution is unreliable. Such limit was not found for the modified (non-singular) reformulation. This allows to use this modified method also for the very low Weissenberg numbers (i.e. close to the Newtonian limit).
Keywords:
non-Newtonian, viscoelastic, log-conformation, finite-volume, OpenFOAM, lid-driven cavity

Fulltext: PDF DOI: https://doi.org/10.14311/TPFM.2017.040

In Proceedings Topical Problems of Fluid Mechanics 2017, Prague, 2017 Edited by David Šimurda and Tomáš Bodnár, pp. 321-328 ISBN 978-80-87012-61-1 (Print) ISSN 2336-5781 (Print)