Lattice Boltzmann simulations of drying suspensions of soft particles

Wouters, Maarten; Aouane, Othmane; Sega, Marcello; Harting, Jens

doi:10.1098/rsta.2020.0399

Cited by 5 publications

(1 citation statement)

References 36 publications

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“…The lattice Boltzmann method (LBM) [1][2][3] applies for fluid modeling within a wide range of engineering, biological and physical problems with complex static and moving surfaces, such as particle-laden ones [4][5][6][7][8][9], suspensions of soft particles [10], red blood cells [11] and pulsatile [12,13] flows, porous flow in materials [14], synthetic structures [15][16][17][18][19][20], or natural rocks [21][22][23][24]. These problems are essentially described by the Stokes and finite Reynolds number regimes, and characterized by a coarse grid resolution over a narrow fluid path.…”

Section: Introductionmentioning

confidence: 99%

Unified directional parabolic-accurate lattice Boltzmann boundary schemes for grid-rotated narrow gaps and curved walls in creeping and inertial fluid flows

Ginzburg

Silva²,

Marson³

et al. 2023

Phys. Rev. E

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The goal of this work is to advance the characteristics of existing lattice Boltzmann Dirichlet velocity boundary schemes in terms of the accuracy, locality, stability, and mass conservation for arbitrarily grid-inclined straight walls, curved surfaces, and narrow fluid gaps, for both creeping and inertial flow regimes. We reach this objective with two infinite-member boundary classes: (1) the single-node "Linear Plus" (LI + ) and (2) the two-node "Extended Multireflection" (EMR). The LI + unifies all directional rules relying on the linear combinations of up to three pre-or postcollision populations, including their "ghost-node" interpolations and adjustable nonequilibrium approximations. On this basis, we propose three groups of LI + nonequilibrium local corrections:(1) the LI + 1 is parametrized, meaning that its steady-state solution is physically consistent: the momentum accuracy is viscosity-independent in Stokes flow, and it is fixed by the Reynolds number (Re) in inertial flow;(2) the LI + 3 is parametrized, exact for arbitrary grid-rotated Poiseuille force-driven Stokes flow and thus most accurate in porous flow; and (3) the LI + 4 is parametrized, exact for pressure and inertial term gradients, and hence advantageous in very narrow porous gaps and at higher Reynolds range. The directional, two-relaxation-time collision operator plays a crucial role for all these features, but also for efficiency and robustness of the boundary schemes due to a proposed nonequilibrium linear stability criterion which reliably delineates their suitable coefficients and relaxation space. Our methodology allows one to improve any directional rule for Stokes or Navier-Stokes accuracy, but their parametrization is not guaranteed. In this context, the parametrized two-node EMR class enlarges the single-node schemes to match exactness in a grid-rotated linear Couette flow modeled with an equilibrium distribution designed for the Navier-Stokes equation (NSE). However, exactness of a grid-rotated Poiseuille NSE flow requires us to perform (1) the modification of the standard NSE term for exact bulk solvability and (2) the EMR extension towards the third neighbor node. A unique relaxation and equilibrium exact configuration for grid-rotated Poiseuille NSE flow allows us to classify the Galilean invariance characteristics of the boundary schemes without any bulk interference; in turn, its truncated solution suggests how, when increasing the Reynolds number, to avoid a deterioration of the mass-leakage rate and momentum accuracy due to a specific Reynolds scaling of the kinetic relaxation collision rate. The optimal schemes and strategies for creeping and inertial regimes are then singled out through a series of numerical tests, such as grid-rotated channels and rotated Couette flow with wall-normal injection, cylindrical porous array, and Couette flow between concentric cylinders, also comparing them against circular-shape fitted FEM solutions.

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Section: Introductionmentioning

confidence: 99%

Unified directional parabolic-accurate lattice Boltzmann boundary schemes for grid-rotated narrow gaps and curved walls in creeping and inertial fluid flows

Ginzburg

Silva²,

Marson³

et al. 2023

Phys. Rev. E

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Flow-Induced Locomotion of a Flexible Filament in the Wake of a Cylinder in Non-Newtonian Flows

Afra

Delouei²,

Tarokh³

2022

International Journal of Mechanical Sciences

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Challenges and opportunities in upscaling inkjet-printing of OPV

Steinberger,

Xie,

Ronsin

et al. 2024

Flex. Print. Electron.

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The power conversion efficiency (PCE) and long-term stability of organic solar cells (OSCs) have increased tremendously over the past years, reaching up to 19.2% on research cells and 14.5% on large modules. To take the final step towards industrialization, fabrication methods that can be upscaled and directly implemented in industrial processes need to be developed.In recent years, well-known industrial techniques, like drop-on-demand (DOD) inkjet printing, have been further developed within the OPV community, as it enables versatile printing of arbitrary, free-form organic solar modules with different colors—a key feature for modern building-integrated photovoltaics (BIPV) and several niche applications of OPV printed on any kind object. In this review, aside a brief summary of recent developments, we provide an overview of the biggest challenges in OPV inkjet-printing and define design rules to overcome these issues. Further perspectives of OPV inkjet-printing conclude the review.

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Lattice Boltzmann simulations of drying suspensions of soft particles

Cited by 5 publications

References 36 publications

Unified directional parabolic-accurate lattice Boltzmann boundary schemes for grid-rotated narrow gaps and curved walls in creeping and inertial fluid flows

Unified directional parabolic-accurate lattice Boltzmann boundary schemes for grid-rotated narrow gaps and curved walls in creeping and inertial fluid flows

Flow-Induced Locomotion of a Flexible Filament in the Wake of a Cylinder in Non-Newtonian Flows

Challenges and opportunities in upscaling inkjet-printing of OPV

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