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Lattice Boltzmann simulations of a viscoelastic shear-thinning fluid

Papenkort, S. and Voigtmann, Th. (2015) Lattice Boltzmann simulations of a viscoelastic shear-thinning fluid. Journal of Chemical Physics, 143, 044512. American Institute of Physics (AIP). DOI: 10.1063/1.4927576 ISSN 0021-9606

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Abstract

We present a hybrid lattice Boltzmann algorithm for the simulation of flow glass-forming fluids, characterized by slow structural relaxation, at the level of the Navier-Stokes equation. The fluid is described in terms of a nonlinear integral constitutive equation, relating the stress tensor locally to the history of flow. As an application, we present results for an integral nonlinear Maxwell model that combines the effects of (linear) viscoelasticity and (nonlinear) shear thinning. We discuss the transient dynamics of velocities, shear stresses, and normal stress differences in planar pressure-driven channel flow, after switching on (startup) and off (cessation) of the driving pressure. This transient dynamics depends nontrivially on the channel width due to an interplay between hydrodynamic momentum diffusion and slow structural relaxation.

Item URL in elib:https://elib.dlr.de/99740/
Document Type:Article
Title:Lattice Boltzmann simulations of a viscoelastic shear-thinning fluid
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Papenkort, S.simon.papenkort (at) dlr.deUNSPECIFIED
Voigtmann, Th.thomas.voigtmann (at) dlr.deUNSPECIFIED
Date:2015
Journal or Publication Title:Journal of Chemical Physics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:143
DOI :10.1063/1.4927576
Page Range:044512
Publisher:American Institute of Physics (AIP)
ISSN:0021-9606
Status:Published
Keywords:lattice Boltzmann simulations, computational fluid dynamics, non-Newtonian fluid
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):R - Vorhaben Materialwissenschaftliche Forschung (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Voigtmann, Dr.rer.nat. Thomas
Deposited On:24 Nov 2015 09:24
Last Modified:08 Mar 2018 18:42

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