Romain Mari
YOU?
Author Swipe
View article: Giant density fluctuations in locally hyperuniform states
Giant density fluctuations in locally hyperuniform states Open
Systems driven far from equilibrium may exhibit anomalous density fluctuations: active matter with orientational order displays giant density fluctuations at a large scale, while systems of interacting particles close to an absorbing phase…
View article: Musculocutaneous Nerve Compression by a Humeral Osteophyte: An Unusual and Difficult-to-Diagnose Cause of Peripheral Neuropathy
Musculocutaneous Nerve Compression by a Humeral Osteophyte: An Unusual and Difficult-to-Diagnose Cause of Peripheral Neuropathy Open
Isolated neuropathy of the musculocutaneous nerve is an uncommon condition, and compression by a bony outgrowth represents an exceptionally rare cause. We describe the case of a 58-year-old man who presented with motor and sensory deficits…
View article: Disorder-induced stress-flow misalignment in soft glassy materials revealed using multi-directional shear
Disorder-induced stress-flow misalignment in soft glassy materials revealed using multi-directional shear Open
Controlling the mechanical response of soft glassy materials, such as emulsions, foams, and colloidal suspensions, is key for many industrial processes. While their steady-state flow behavior is reasonably well understood, their response t…
View article: Modelling the evolution of flow-induced anisotropy of concentrated suspensions
Modelling the evolution of flow-induced anisotropy of concentrated suspensions Open
Suspensions, which exhibit complex behaviors such as shear thickening, thinning, and jamming, are prevalent in nature and industry. However, predicting the mechanical properties of concentrated suspensions, in both steady state and the tra…
View article: Transients in shear thickening suspensions: When hydrodynamics matters
Transients in shear thickening suspensions: When hydrodynamics matters Open
International audience
View article: Protocol dependence for avalanches under constant stress in elastoplastic models
Protocol dependence for avalanches under constant stress in elastoplastic models Open
Close to the yielding transition, amorphous solids exhibit a jerky dynamics characterized by plastic avalanches. The statistics of these avalanches have been measured experimentally and numerically using a variety of different triggering p…
View article: Unifying suspension and granular shear-induced self-diffusion
Unifying suspension and granular shear-induced self-diffusion Open
Shear-induced self-diffusion is a fundamental mode of transport in granular flows. Yet its critical behaviour and dependence on the particle solid fraction are still unclear. Here, we rationalize these dependencies by performing two-dimens…
View article: Giant density fluctuations in locally hyperuniform states
Giant density fluctuations in locally hyperuniform states Open
Systems driven far from equilibrium may exhibit anomalous density fluctuations: active matter with orientational order display giant density fluctuations at large scale, while systems of interacting particles close to an absorbing phase tr…
View article: Protocol dependence for avalanches under constant stress in elastoplastic models
Protocol dependence for avalanches under constant stress in elastoplastic models Open
Close to the yielding transition, amorphous solids exhibit a jerky dynamics characterized by plastic avalanches. The statistics of these avalanches have been measured experimentally and numerically using a variety of different triggering p…
View article: Transients in shear thickening suspensions: when hydrodynamics matters
Transients in shear thickening suspensions: when hydrodynamics matters Open
Using particle-based numerical simulations performed under pressure-imposed conditions, we investigate the transient dilation dynamics of a shear thickening suspension brought to shear jamming. We show that the stress levels, instead of di…
View article: Yielding Is an Absorbing Phase Transition with Vanishing Critical Fluctuations
Yielding Is an Absorbing Phase Transition with Vanishing Critical Fluctuations Open
The yielding transition in athermal complex fluids can be interpreted as an absorbing phase transition between an elastic, absorbing state with high mesoscopic degeneracy and a flowing, active state. We characterize quantitatively this pha…
View article: Yielding is an absorbing phase transition with vanishing critical fluctuations
Yielding is an absorbing phase transition with vanishing critical fluctuations Open
The yielding transition in athermal complex fluids can be interpreted as an absorbing phase transition between an elastic, absorbing state with high mesoscopic degeneracy and a flowing, active state. We characterize quantitatively this pha…
View article: Microscopically grounded constitutive model for dense suspensions of soft particles below jamming
Microscopically grounded constitutive model for dense suspensions of soft particles below jamming Open
International audience
View article: Rheology of Dense Suspensions under Shear Rotation
Rheology of Dense Suspensions under Shear Rotation Open
Dense non-Brownian suspensions exhibit a spectacular and abrupt drop in viscosity under change of shear direction, as revealed by shear inversions (reversals) or orthogonal superposition. Here, we introduce an experimental setup to systema…
View article: Rheology of dense suspensions under shear rotation
Rheology of dense suspensions under shear rotation Open
Dense non-Brownian suspensions exhibit a spectacular and abrupt drop in viscosity under change of shear direction, as revealed by shear inversions (reversals) or orthogonal superposition. Here, we introduce an experimental setup to systema…
View article: Transient flows and migration in granular suspensions: key role of Reynolds-like dilatancy
Transient flows and migration in granular suspensions: key role of Reynolds-like dilatancy Open
We investigate the transient dynamics of a sheared suspension of neutrally buoyant particles in pressure-imposed rheology configuration, subject to a sudden change in shear rate or external pressure. Discrete element method simulations sho…
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: Derivation of a constitutive model for the rheology of jammed soft suspensions from particle dynamics
Derivation of a constitutive model for the rheology of jammed soft suspensions from particle dynamics Open
Considering the rheology of two-dimensional soft suspensions above the jamming density, we derive a tensorial constitutive model from the microscopic particle dynamics. Starting from the equation governing the N -particle distribution, we …
View article: Transient flows and migration in granular suspensions: key role of Reynolds-like dilatancy
Transient flows and migration in granular suspensions: key role of Reynolds-like dilatancy Open
We investigate the transient dynamics of a sheared suspension of neutrally buoyant particles under pressure-imposed conditions, subject to a sudden change in shear rate or external pressure. Discrete Element Method simulations show that, d…
View article: Dynamics of microstructure anisotropy and rheology of soft jammed\n suspensions
Dynamics of microstructure anisotropy and rheology of soft jammed\n suspensions Open
We explore the rheology predicted by a recently proposed constitutive model\nfor jammed suspensions of soft elastic particles derived from particle-level\ndynamics [Cuny et al., Phys. Rev. Lett. 127, 218003 (2021)]. Our model predicts\ntha…
View article: Absorbing phase transitions in systems with mediated interactions
Absorbing phase transitions in systems with mediated interactions Open
Experiments of periodically sheared colloidal suspensions or soft amorphous solids display a transition from reversible to irreversible particle motion that, when analysed stroboscopically in time, is interpreted as an absorbing phase tran…
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: Microscopic theory for the rheology of jammed soft suspensions
Microscopic theory for the rheology of jammed soft suspensions Open
We develop a constitutive model allowing for the description of the rheology\nof two-dimensional soft dense suspensions above jamming. Starting from a\nstatistical description of the particle dynamics, we derive, using a set of\napproximat…
View article: Transients in pressure-imposed shearing of dense granular suspensions
Transients in pressure-imposed shearing of dense granular suspensions Open
Granular materials whether dry or immersed in fluid show dilation or compaction depending upon the initial conditions, solid fraction and normal stress. Here we probe the transient response of a dense granular suspension subjected to chang…
View article: Density waves in shear-thickening suspensions
Density waves in shear-thickening suspensions Open
Flows during discontinuous shear-thickening transition are heterogeneous, unsteady, and loose azimuthal symmetry.
View article: Microscopic Origin of Frictional Rheology in Dense Suspensions: Correlations in Force Space
Microscopic Origin of Frictional Rheology in Dense Suspensions: Correlations in Force Space Open
We develop a statistical framework for the rheology of dense, non-Brownian suspensions, based on correlations in a space representing forces, which is dual to position space. Working with the ensemble of steady state configurations obtaine…
View article: Dynamic Vorticity Banding in Discontinuously Shear Thickening Suspensions
Dynamic Vorticity Banding in Discontinuously Shear Thickening Suspensions Open
It has recently been argued that steady-state vorticity bands cannot arise in shear thickening suspensions because the normal stress imbalance across the interface between the bands will set up particle migrations. In this Letter, we devel…