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

Marta Perez , Adrien Scheuer (1) , Emmanuelle Abisset-Chavanne (1) , Amine Ammar (2) , Francisco Chinesta (1) , Roland Keunings (3)

1 GeM - Institut de Recherche en Génie Civil et Mécanique
2 LAMPA - Laboratoire Angevin de Mécanique, Procédés et InnovAtion
3 UCL - Université Catholique de Louvain = Catholic University of Louvain

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.

Domaines: Mécanique des fluides [physics.class-ph]

Marta Perez, Adrien Scheuer, Emmanuelle Abisset-Chavanne, Amine Ammar, Francisco Chinesta, et al.. On the multi-scale description of micro-structured fluids composed of aggregating rods. Continuum Mechanics and Thermodynamics, 2018, ⟨10.1007/s00161-018-0659-1⟩. ⟨hal-01829963⟩