On the multi-scale description of micro-structured fluids composed of aggregating rods

When addressing the flow of concentrated suspensions composed of rods, dense clusters are observed. Thus, the adequate modelling and simulation of such a flow requires addressing the kinematics of these dense clusters and their impact on the flow in which they are immersed. In a former work, we addr...

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Bibliographic Details
Published in:Continuum mechanics and thermodynamics 2019, Vol.31 (4), p.955-967
Main Authors: Perez, Marta, Scheuer, Adrien, Abisset-Chavanne, Emmanuelle, Ammar, Amine, Chinesta, Francisco, Keunings, Roland
Format: Article
Language:English
Subjects:
Engineering Sciences
Materials
Online Access:Get full text
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Summary:When addressing the flow of concentrated suspensions composed of rods, dense clusters are observed. Thus, the adequate modelling and simulation of such a flow requires addressing the kinematics of these dense clusters and their impact on the flow in which they are immersed. In a former work, we addressed a first modelling framework of these clusters, assumed so dense that they were considered rigid and their kinematics (flow-induced rotation) were totally defined by a symmetric tensor c with unit trace representing the cluster conformation. Then, the rigid nature of the clusters was relaxed, assuming them deformable, and a model giving the evolution of both the cluster shape and its microstructural orientation descriptor (the so-called shape and orientation tensors) was proposed. This paper compares the predictions coming from those models with finer-scale discrete simulations inspired from molecular dynamics modelling.
ISSN:0935-1175
1432-0959
DOI:10.1007/s00161-018-0659-1