Ryohei Seto
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View article: Numerical simulations of spatiotemporal instabilities in discontinuous shear-thickening fluids
Numerical simulations of spatiotemporal instabilities in discontinuous shear-thickening fluids Open
Discontinuous shear-thickening (DST) fluids exhibit unique instability properties in a wide range of flow conditions. We present numerical simulations of a scalar model for DST fluids in a planar simple shear using the smoothed particle hy…
View article: Numerical Simulations of Spatiotemporal Instabilities in Discontinuous Shear Thickening Fluids
Numerical Simulations of Spatiotemporal Instabilities in Discontinuous Shear Thickening Fluids Open
Discontinuous Shear Thickening (DST) fluids exhibit unique instability properties in a wide range of flow conditions. We present numerical simulations of a scalar model for DST fluids in a planar simple shear using the Smoothed Particle Hy…
View article: Bending–Rotation Coupling in the Viscoelasticity of Semiflexible Polymers─Rigorous Perturbation Analysis from the Rod Limit
Bending–Rotation Coupling in the Viscoelasticity of Semiflexible Polymers─Rigorous Perturbation Analysis from the Rod Limit Open
Brownian motion and viscoelasticity of semiflexible polymers is a subject that has been studied for many years. Still, rigorous analysis has been hindered due to the difficulty in handling the constraint that polymer chains cannot be stret…
View article: Mechanism for axial pattern formation of concentrated suspension in a horizontal rotating cylinder
Mechanism for axial pattern formation of concentrated suspension in a horizontal rotating cylinder Open
We have performed numerical simulations to investigate the phenomenon of axial pattern formation exhibited by a non-neutrally buoyant concentrated suspension. Continuum modelling of the concentrated suspension is done using the suspension …
View article: Microstructural smoothed particle hydrodynamics model and simulations of discontinuous shear-thickening fluids
Microstructural smoothed particle hydrodynamics model and simulations of discontinuous shear-thickening fluids Open
Despite the recent interest in the discontinuous shear-thickening (DST) behavior, few computational works tackle the rich hydrodynamics of these fluids. In this work, we present the first implementation of a microstructural DST model in sm…
View article: Ridge instability in dense suspensions caused by the second normal stress difference
Ridge instability in dense suspensions caused by the second normal stress difference Open
A dense suspension of the cornstarch flowing on a very inclined wall finally forms some ridge-like patterns of the free surface. The onset of pattern formation is the primary target to elucidate the mechanism. In this work, based on the co…
View article: Odd Response-Induced Phase Separation of Active Spinners
Odd Response-Induced Phase Separation of Active Spinners Open
Due to the breaking of time-reversal and parity symmetries and the presence of non-conservative microscopic interactions, active spinner fluids and solids respectively exhibit nondissipative odd viscosity and nonstorage odd elasticity, eng…
View article: Non-Newtonian ViRheometry via Similarity Analysis
Non-Newtonian ViRheometry via Similarity Analysis Open
We estimate the three Herschel-Bulkley parameters (yield stress σ Y , power-law index n , and consistency parameter η ) for shear-dependent fluid-like materials possibly with large-scale inclusions, for which rheometers may fail to provide…
View article: Microstructural Smoothed Particle Hydrodynamics Model and Simulations of Discontinuous Shear-Thickening Fluids
Microstructural Smoothed Particle Hydrodynamics Model and Simulations of Discontinuous Shear-Thickening Fluids Open
Despite the recent interest in the discontinuous shear-thickening (DST) behaviour, few computational works tackle the rich hydrodynamics of these fluids. In this work, we present the first implementation of a microstructural DST model in S…
View article: Ridge instability in dense suspensions caused by the second normal stress difference
Ridge instability in dense suspensions caused by the second normal stress difference Open
A dense suspension of the cornstarch flowing on a very inclined wall finally forms some ridge-like patterns of the free surface. The onset of pattern formation is the primary target to elucidate the mechanism. In this work, based on the co…
View article: Filled Colloidal Gel Rheology: Strengthening, Stiffening, and Tunability
Filled Colloidal Gel Rheology: Strengthening, Stiffening, and Tunability Open
Filler-induced strengthening is ubiquitous in materials science and is particularly well-established in polymeric nanocomposites. Despite having similar constituents, colloidal gels with solid filling exhibit distinct rheology, which is of…
View article: Colloidal Gelation with Non-Sticky Particles
Colloidal Gelation with Non-Sticky Particles Open
Colloidal gels are widely applied in industry due to their rheological character -- no flow takes place below the yield stress. Such property enables gels to maintain uniform distribution in practical formulations; otherwise, solid compone…
View article: Odd viscosity in chiral passive suspensions
Odd viscosity in chiral passive suspensions Open
Prior studies have revealed that nonzero odd viscosity is an essential property for chiral active fluids. Here we report that such an odd viscosity also exists in suspensions of non-active or non-externally-driven but chirally-shaped parti…
View article: How Surface Roughness Affects the Interparticle Interactions at a Liquid Interface
How Surface Roughness Affects the Interparticle Interactions at a Liquid Interface Open
Shapes of colloids matter at liquid interfaces. We explore the interactions between rough-surfaced nanocolloids at the air--water interface through the compaction of monolayers experimentally and numerically. Sufficiently rough systems exh…
View article: Odd Viscosity in Chiral Passive Suspensions
Odd Viscosity in Chiral Passive Suspensions Open
Prior studies have revealed that nonzero odd viscosity is an essential property for chiral active fluids. Here we report that such an odd viscosity also exists in suspensions of non-active or non-externally-driven but chirally-shaped parti…
View article: The Physics of Dense Suspensions
The Physics of Dense Suspensions Open
Dense suspensions of particles are relevant to many applications and are a key platform for developing a fundamental physics of out-of-equilibrium systems. They present challenging flow properties, apparently turning from liquid to solid u…
View article: Emergent stripes of active rotors in shear flows
Emergent stripes of active rotors in shear flows Open
The shear-induced self-organization of active rotors into stripy aggregates is studied by carrying out computational simulations. The rotors, modeled by monolayers of frictional spheres, develop to stripy microstructures only when they cou…
View article: Shear Jamming and Fragility of Suspensions in a Continuum Model with Elastic Constraints
Shear Jamming and Fragility of Suspensions in a Continuum Model with Elastic Constraints Open
Under an applied traction, highly concentrated suspensions of solid particles in fluids can turn from a state in which they flow to a state in which they counteract the traction as an elastic solid: a shear-jammed state. Remarkably, the su…
View article: The physics of dense suspensions
The physics of dense suspensions Open
Dense suspensions of particles are relevant to many applications and are a key platform for developing a fundamental physics of out-of-equilibrium systems. They present challenging flow properties, apparently turning from liquid to solid u…
View article: Predictions of microstructure and stress in planar extensional flows of a dense viscous suspension
Predictions of microstructure and stress in planar extensional flows of a dense viscous suspension Open
View article: Shear Thickening and Jamming of Dense Suspensions: The “Roll” of Friction
Shear Thickening and Jamming of Dense Suspensions: The “Roll” of Friction Open
Particle-based simulations of discontinuous shear thickening (DST) and shear jamming (SJ) suspensions are used to study the role of stress-activated constraints, with an emphasis on resistance to gearlike rolling. Rolling friction decrease…
View article: Predictions of microstructure and stress in two-dimensional pure shearing of a dense viscous suspension
Predictions of microstructure and stress in two-dimensional pure shearing of a dense viscous suspension Open
We consider pure shearing of a dense layer of spheres in a viscous fluid and employ force and moment equilibrium to determine the trajectory of particle pairs that contribute to the stress. In doing this, we use Stokesian Dynamics simulati…
View article: Normal stress differences in dense suspensions
Normal stress differences in dense suspensions Open
The presence and the microscopic origin of normal stress differences in dense suspensions under simple shear flows are investigated by means of inertialess particle dynamics simulations, taking into account hydrodynamic lubrication and fri…
View article: A theoretical framework for steady-state rheometry in generic flow conditions
A theoretical framework for steady-state rheometry in generic flow conditions Open
We introduce a general decomposition of the stress tensor for incompressible\nfluids in terms of its components on a tensorial basis adapted to the local\nflow conditions, which include extensional flows, simple shear flows, and any\ntype …
View article: Beyond the viscometric characterization of fluids
Beyond the viscometric characterization of fluids Open
An exhaustive set of functions that characterize the material response of incompressible fluids in any flow geometry is introduced. The general representation of the stress tensor in terms of such functions and of the local kinematical par…