Publikation: Channel flow of a tensorial shear-thinning Maxwell model : Lattice Boltzmann simulations
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2014
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Nonlinear mechanical response of supercooled melts under applied stress, FOR 1394, P3
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The Journal of Chemical Physics. 2014, 140(16), 164507. ISSN 0021-9606. eISSN 1089-7690. Available under: doi: 10.1063/1.4872219
Zusammenfassung
We discuss pressure-driven channel flow for a model of shear-thinning glass-forming fluids, employing a modified lattice-Boltzmann (LB) simulation scheme. The model is motivated by a recent microscopic approach to the nonlinear rheology of colloidal suspensions and captures a nonvanishing dynamical yield stress and the appearance of normal-stress differences and a flow-induced pressure contribution. The standard LB algorithm is extended to deal with tensorial, nonlinear constitutive equations of this class. The new LB scheme is tested in 2D pressure-driven channel flow and reproduces the analytical steady-state solution. The transient dynamics after startup and removal of the pressure gradient reproduce a finite stopping time for the cessation flow of yield-stress fluids in agreement with previous analytical estimates.
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530 Physik
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nichtlineare Rheologie, Lattice-Boltzmann-Simulationen
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PAPENKORT, Simon, Thomas VOIGTMANN, 2014. Channel flow of a tensorial shear-thinning Maxwell model : Lattice Boltzmann simulations. In: The Journal of Chemical Physics. 2014, 140(16), 164507. ISSN 0021-9606. eISSN 1089-7690. Available under: doi: 10.1063/1.4872219BibTex
@article{Papenkort2014-04-28Chann-27694,
year={2014},
doi={10.1063/1.4872219},
title={Channel flow of a tensorial shear-thinning Maxwell model : Lattice Boltzmann simulations},
number={16},
volume={140},
issn={0021-9606},
journal={The Journal of Chemical Physics},
author={Papenkort, Simon and Voigtmann, Thomas},
note={Article Number: 164507}
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<dcterms:abstract xml:lang="eng">We discuss pressure-driven channel flow for a model of shear-thinning glass-forming fluids, employing a modified lattice-Boltzmann (LB) simulation scheme. The model is motivated by a recent microscopic approach to the nonlinear rheology of colloidal suspensions and captures a nonvanishing dynamical yield stress and the appearance of normal-stress differences and a flow-induced pressure contribution. The standard LB algorithm is extended to deal with tensorial, nonlinear constitutive equations of this class. The new LB scheme is tested in 2D pressure-driven channel flow and reproduces the analytical steady-state solution. The transient dynamics after startup and removal of the pressure gradient reproduce a finite stopping time for the cessation flow of yield-stress fluids in agreement with previous analytical estimates.</dcterms:abstract>
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