Professor Suzanne Fielding's Outputs (74)

Edge fracture instability in sheared complex fluids: Onset criterion and possible mitigation strategy (2019)
Journal Article
Hemingway, E. J., & Fielding, S. M. (2019). Edge fracture instability in sheared complex fluids: Onset criterion and possible mitigation strategy. Journal of Rheology, 63(5), https://doi.org/10.1122/1.5095717

We perform a detailed theoretical study of the edge fracture instability, which commonly destabilizes the fluid-air interface during strong shear flows of entangled polymeric fluids, leading to unreliable rheological measurements. By means of direct... Read More about Edge fracture instability in sheared complex fluids: Onset criterion and possible mitigation strategy.

Linear instability of shear thinning pressure driven channel flow (2019)
Journal Article
Barlow, H., Hemingway, E., Clarke, A., & Fielding, S. (2019). Linear instability of shear thinning pressure driven channel flow. Journal of Non-Newtonian Fluid Mechanics, 270, 66-78. https://doi.org/10.1016/j.jnnfm.2019.07.004

We study theoretically pressure driven planar channel flow of shear thinning viscoelastic fluids. Combining linear stability analysis and full nonlinear simulation, we study the instability of an initially one-dimensional base state to the of two-dim... Read More about Linear instability of shear thinning pressure driven channel flow.

Dynamic Vorticity Banding in Discontinuously Shear Thickening Suspensions (2018)
Journal Article
Chacko, R., Mari, R., Cates, M., & Fielding, S. (2018). Dynamic Vorticity Banding in Discontinuously Shear Thickening Suspensions. Physical Review Letters, 121(10), Article 108003. https://doi.org/10.1103/physrevlett.121.108003

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 develop a simple... Read More about Dynamic Vorticity Banding in Discontinuously Shear Thickening Suspensions.

Shear Reversal in Dense Suspensions: The Challenge to Fabric Evolution Models from Simulation Data (2018)
Journal Article
Chacko, R. N., Mari, R., Fielding, S. M., & Cates, M. E. (2018). Shear Reversal in Dense Suspensions: The Challenge to Fabric Evolution Models from Simulation Data. Journal of Fluid Mechanics, 847, 700-734. https://doi.org/10.1017/jfm.2018.279

Dense suspensions of hard particles are important as industrial or environmental materials (e.g. fresh concrete, food, paint or mud). To date, most constitutive models developed to describe them are, explicitly or effectively, ‘fabric evolution model... Read More about Shear Reversal in Dense Suspensions: The Challenge to Fabric Evolution Models from Simulation Data.

Edge-Induced Shear Banding in Entangled Polymeric Fluids (2018)
Journal Article
Hemingway, E. J., & Fielding, S. M. (2018). Edge-Induced Shear Banding in Entangled Polymeric Fluids. Physical Review Letters, 120(13), Article 138002. https://doi.org/10.1103/physrevlett.120.138002

Despite decades of research, the question of whether solutions and melts of highly entangled polymers exhibit shear banding as their steady state response to a steadily imposed shear flow remains controversial. From a theoretical viewpoint, an import... Read More about Edge-Induced Shear Banding in Entangled Polymeric Fluids.

Shear banding in large amplitude oscillatory shear (LAOStrain and LAOStress) of soft glassy materials (2018)
Journal Article
Radhakrishnan, R., & Fielding, S. M. (2018). Shear banding in large amplitude oscillatory shear (LAOStrain and LAOStress) of soft glassy materials. Journal of Rheology, 62(2), 559-576. https://doi.org/10.1122/1.5023381

We study theoretically shear banding in soft glassy materials subject to large amplitude time-periodic shear flows, considering separately the protocols of large amplitude oscillatory shear strain, large amplitude square or triangular or sawtooth str... Read More about Shear banding in large amplitude oscillatory shear (LAOStrain and LAOStress) of soft glassy materials.

Thickening of viscoelastic flow in a model porous medium (2017)
Journal Article
Hemingway, E., Clarke, A., Pearson, J., & Fielding, S. (2017). Thickening of viscoelastic flow in a model porous medium. Journal of Non-Newtonian Fluid Mechanics, 251, 56-68. https://doi.org/10.1016/j.jnnfm.2017.11.002

We study numerically two-dimensional creeping viscoelastic flow past a biperiodic square array of cylinders within the Oldroyd B, FENE-CR and FENE-P constitutive models of dilute polymer solutions. Our results capture the initial mild decrease then d... Read More about Thickening of viscoelastic flow in a model porous medium.

Edge Fracture in Complex Fluids (2017)
Journal Article
Hemingway, E. J., Kusumaatmaja, H., & Fielding, S. M. (2017). Edge Fracture in Complex Fluids. Physical Review Letters, 119(2), Article 028006. https://doi.org/10.1103/physrevlett.119.028006

We study theoretically the edge fracture instability in sheared complex fluids, by means of linear stability analysis and direct nonlinear simulations. We derive an exact analytical expression for the onset of edge fracture in terms of the shear-rate... Read More about Edge Fracture in Complex Fluids.

Understanding rheological hysteresis in soft glassy materials (2017)
Journal Article
Radhakrishnan, R., Divoux, T., Manneville, S., & Fielding, S. M. (2017). Understanding rheological hysteresis in soft glassy materials. Soft Matter, 13(9), 1834-1852. https://doi.org/10.1039/c6sm02581a

Motivated by recent experimental studies of rheological hysteresis in soft glassy materials, we study numerically strain rate sweeps in simple yield stress fluids and viscosity bifurcating yield stress fluids. Our simulations of downward followed by... Read More about Understanding rheological hysteresis in soft glassy materials.

Necking after extensional filament stretching of complex fluids and soft solids (2017)
Journal Article
Hoyle, D., & Fielding, S. (2017). Necking after extensional filament stretching of complex fluids and soft solids. Journal of Non-Newtonian Fluid Mechanics, 247, 132-145. https://doi.org/10.1016/j.jnnfm.2017.06.009

We perform linear stability analysis and nonlinear slender filament simulations of extensional necking in complex fluids and soft solids, during the stress relaxation process following an interrupted strain ramp. We start by deriving analytical crite... Read More about Necking after extensional filament stretching of complex fluids and soft solids.

Criteria for extensional necking instability in complex fluids and soft solids. Part I: Imposed Hencky strain rate protocol (2016)
Journal Article
Hoyle, D. M., & Fielding, S. M. (2016). Criteria for extensional necking instability in complex fluids and soft solids. Part I: Imposed Hencky strain rate protocol. Journal of Rheology, 60(6), 1347-1375. https://doi.org/10.1122/1.4965036

We study theoretically the necking dynamics of a filament of complex fluid or soft solid in uniaxial tensile stretching at constant imposed Hencky strain rate ϵ̇ ϵ̇, by means of linear stability analysis and nonlinear (slender filament) simulations.... Read More about Criteria for extensional necking instability in complex fluids and soft solids. Part I: Imposed Hencky strain rate protocol.

Criteria for extensional necking instability in complex fluids and soft solids. Part II: Imposed tensile stress and force protocols (2016)
Journal Article
Hoyle, D. M., & Fielding, S. M. (2016). Criteria for extensional necking instability in complex fluids and soft solids. Part II: Imposed tensile stress and force protocols. Journal of Rheology, 60(6), 1377-1397. https://doi.org/10.1122/1.4965037

We study the necking of a filament of complex fluid or soft solid subject to uniaxial tensile stretching, separately under conditions of constant imposed tensile stress and constant imposed tensile force, by means of linear stability analysis and non... Read More about Criteria for extensional necking instability in complex fluids and soft solids. Part II: Imposed tensile stress and force protocols.

Shear Banding of Soft Glassy Materials in Large Amplitude Oscillatory Shear (2016)
Journal Article
Radhakrishnan, R., & Fielding, S. M. (2016). Shear Banding of Soft Glassy Materials in Large Amplitude Oscillatory Shear. Physical Review Letters, 117(18), Article 188001. https://doi.org/10.1103/physrevlett.117.188001

We study shear banding in soft glassy materials subject to a large amplitude oscillatory shear flow (LAOS). By numerical simulations of the widely used soft glassy rheology model, supplemented by more general physical arguments, we demonstrate strong... Read More about Shear Banding of Soft Glassy Materials in Large Amplitude Oscillatory Shear.

Shear banding in large amplitude oscillatory shear (LAOStrain and LAOStress) of polymers and wormlike micelles (2016)
Journal Article
Carter, K. A., Girkin, J. M., & Fielding, S. M. (2016). Shear banding in large amplitude oscillatory shear (LAOStrain and LAOStress) of polymers and wormlike micelles. Journal of Rheology, 60(5), Article 883. https://doi.org/10.1122/1.4960512

We investigate theoretically shear banding in large amplitude oscillatory shear (LAOS) of polymers and wormlike micelles. In LAOStrain we find banding at low frequencies and sufficiently high strain rate amplitudes in fluids for which the underlying... Read More about Shear banding in large amplitude oscillatory shear (LAOStrain and LAOStress) of polymers and wormlike micelles.

Triggers and signatures of shear banding in steady and time-dependent flows (2016)
Journal Article
Fielding, S. (2016). Triggers and signatures of shear banding in steady and time-dependent flows. Journal of Rheology, 60(5), 821-834. https://doi.org/10.1122/1.4961480

This précis is aimed as a practical field guide to situations in which shear banding might be expected in complex fluids subject to an applied shear flow. Separately for several of the most common flow protocols, it summarizes the characteristic sign... Read More about Triggers and signatures of shear banding in steady and time-dependent flows.

Correlation lengths in hydrodynamic models of active nematics (2016)
Journal Article
Hemingway, E., Mishra, P., Marchetti, M., & Fielding, S. (2016). Correlation lengths in hydrodynamic models of active nematics. Soft Matter, 12(38), 7943-7952. https://doi.org/10.1039/c6sm00812g

We examine the scaling with activity of the emergent length scales that control the nonequilibrium dynamics of an active nematic liquid crystal, using two popular hydrodynamic models that have been employed in previous studies. In both models we find... Read More about Correlation lengths in hydrodynamic models of active nematics.

Viscoelastic and elastomeric active matter: Linear instability and nonlinear dynamics (2016)
Journal Article
Hemingway, E., Cates, M., & Fielding, S. (2016). Viscoelastic and elastomeric active matter: Linear instability and nonlinear dynamics. Physical Review E, 93(3), Article 032702. https://doi.org/10.1103/physreve.93.032702

We consider a continuum model of active viscoelastic matter, whereby an active nematic liquid crystal is coupled to a minimal model of polymer dynamics with a viscoelastic relaxation time τC. To explore the resulting interplay between active and poly... Read More about Viscoelastic and elastomeric active matter: Linear instability and nonlinear dynamics.

Moving contact line dynamics: from diffuse to sharp interfaces (2015)
Journal Article
Kusumaatmaja, H., Hemingway, E., & Fielding, S. (2016). Moving contact line dynamics: from diffuse to sharp interfaces. Journal of Fluid Mechanics, 788, 209-227. https://doi.org/10.1017/jfm.2015.697

We reconcile two scaling laws that have been proposed in the literature for the slip length associated with a moving contact line in diffuse interface models, by demonstrating each to apply in a different regime of the ratio of the microscopic interf... Read More about Moving contact line dynamics: from diffuse to sharp interfaces.

Clustering and phase behaviour of attractive active particles with hydrodynamics (2015)
Journal Article
Matas Navarro, R., & Fielding, S. M. (2015). Clustering and phase behaviour of attractive active particles with hydrodynamics. Soft Matter, 11(38), 7525-7546. https://doi.org/10.1039/c5sm01061f

We simulate clustering, phase separation and hexatic ordering in a monolayered suspension of active squirming disks subject to an attractive Lennard-Jones-like pairwise interaction potential, taking hydrodynamic interactions between the particles ful... Read More about Clustering and phase behaviour of attractive active particles with hydrodynamics.

Age-Dependent Modes of Extensional Necking Instability in Soft Glassy Materials (2015)
Journal Article
Hoyle, D. M., & Fielding, S. M. (2015). Age-Dependent Modes of Extensional Necking Instability in Soft Glassy Materials. Physical Review Letters, 114(15), Article 158301. https://doi.org/10.1103/physrevlett.114.158301

We study the instability to necking of an initially cylindrical filament of soft glassy material subject to extensional stretching. By numerical simulation of the soft glassy rheology model and a simplified fluidity model, and by analytical predictio... Read More about Age-Dependent Modes of Extensional Necking Instability in Soft Glassy Materials.