317 citations · 1.2k across the 30 of their papers we have counts for
32 papers
Hydrodynamic instabilities in a 2-D sheet of microswimmers embedded in a 3-D fluid
Viktor Škultéty, Dóra Bárdfalvy, Joakim Stenhammar +2
A collection of microswimmers immersed in an incompressible fluid is characterised by strong interactions due to the long-range nature of the hydrodynamic fields generated by indiv…
Interplay between Brownian and hydrodynamic tracer diffusion in suspensions of swimming microorganisms
Henrik Nordanger, Alexander Morozov, Joakim Stenhammar
The general problem of tracer diffusion in non-equilibrium baths is important in a wide range of systems, from the cellular level to geographical lengthscales. In this paper, we re…
Linear stability analysis of purely elastic travelling wave solutions in pressure driven channel flows
Martin Lellep, Moritz Linkmann, Alexander Morozov
Recent studies of pressure-driven flows of dilute polymer solutions in straight channels demonstrated the existence of two-dimensional coherent structures that are disconnected fro…
Active turbulence and spontaneous phase separation in inhomogeneous extensile active gels
Renato Assante, Dom Corbett, Davide Marenduzzo +1
We report numerical results for the hydrodynamics of inhomogeneous lyotropic and extensile active nematic gels. By simulating the coupled Cahn-Hilliard, Navier-Stokes, and Beris-Ed…
Yield-stress transition in suspensions of deformable droplets
Giuseppe Negro, Livio Nicola Carenza, Giuseppe Gonnella +3
Yield-stress materials, which require a sufficiently large forcing to flow, are currently ill-understood theoretically. To gain insight into their yielding transition, here we stud…
Understanding viscoelastic flow instabilities: Oldroyd-B and beyond
Hugo A. Castillo Sanchez, Mihailo R. Jovanovic, Satish Kumar +4
The Oldroyd-B model has been used extensively to predict a host of instabilities in shearing flows of viscoelastic fluids, often realized experimentally using polymer solutions. Th…
Coherent structures in plane channel flow of dilute polymer solutions with vanishing inertia
Alexander Morozov
When subjected to sufficiently strong velocity gradients, solutions of long, flexible polymers exhibit flow instabilities and chaotic motion, often referred to as elastic turbulenc…
Polymers in Swarming Bacterial Turbulence
Ranjiangshang Ran, David A. Gagnon, Alexander Morozov +1
We experimentally investigate the effects of polymer additives on the collective dynamics of swarming Serratia marcescens in quasi two-dimensional (2D) liquid films. We find that e…
Purely elastic linear instabilities in parallel shear flows with free-slip boundary conditions
Martin Lellep, Moritz Linkmann, Bruno Eckhardt +1
We perform a linear stability analysis of viscoelastic plane Couette and plane Poiseuille flows with free-slip boundary conditions. The fluid is described by the Oldroyd-B constitu…
Perspectives on viscoelastic flow instabilities and elastic turbulence
Sujit S. Datta, Arezoo M. Ardekani, Paulo E. Arratia +20
Viscoelastic fluids are a common subclass of rheologically complex materials that are encountered in diverse fields from biology to polymer processing. Often the flows of viscoelas…
Anisotropic diffusion of ellipsoidal tracers in microswimmer suspensions
Henrik Nordanger, Alexander Morozov, Joakim Stenhammar
Tracer particles immersed in suspensions of biological microswimmers such as E. coli or C. reinhardtii display phenomena unseen in conventional equilibrium systems, including stron…
Electrostatic inactivation of RNA viruses at air-water and liquid-liquid interfaces
C. A. Brackley, A. Lips, A. Morozov +2
Understanding the interactions between viruses and surfaces or interfaces is important, as they provide the principles underpinning the cleaning and disinfection of contaminated su…
Creeping thermocapillary motion of a Newtonian droplet suspended in a viscoelastic fluid
Paolo Capobianchi, Mahdi Davoodi, Robert J. Poole +3
In this work we consider theoretically the problem of a Newtonian droplet moving in an otherwise quiescent infinite viscoelastic fluid under the influence of an externally applied…
Pattern formation in active model C with anchoring: bands, aster networks, and foams
Ivan Maryshev, Alexander Morozov, Andrew B. Goryachev +1
We study the dynamics of pattern formation in a minimal model for active mixtures made of microtubules and molecular motors. We monitor the evolution of the (conserved) microtubule…
Symmetric mixtures of pusher and puller microswimmers behave as noninteracting suspensions
Dóra Bárdfalvy, Shan Anjum, Cesare Nardini +2
Suspensions of rear- and front-actuated microswimmers immersed in a fluid, known respectively as ``pushers'' and ``pullers'', display qualitatively different collective behaviours:…
Swimming suppresses correlations in dilute suspensions of pusher microorganisms
Viktor Škultéty, Cesare Nardini, Joakim Stenhammar +2
Active matter exhibits various forms of non-equilibrium states in the absence of external forcing, including macroscopic steady-state currents. Such states are often too complex to…
Debye-Hückel potential at an interface between two media
Alexander Morozov, Iain Muntz, Job H. J. Thijssen +1
Electrostatic interactions between point charges embedded into interfaces separating dielectric media are omnipresent in soft matter systems and often control their stability. Such…
Particle-resolved lattice Boltzmann simulations of 3-dimensional active turbulence
Dora Bardfalvy, Henrik Nordanger, Cesare Nardini +2
Collective behaviour in suspensions of microswimmers is often dominated by the impact of long-ranged hydrodynamic interactions. These phenomena include active turbulence, where sus…
Sedimentation of a rigid helix in viscous media
Martina Palusa, Joost de Graaf, Aidan Brown +1
We consider sedimentation of a rigid helical filament in a viscous fluid under gravity. In the Stokes limit, the drag forces and torques on the filament are approximated within the…
Rheology and microrheology of deformable droplet suspensions
M. Foglino, A. N. Morozov, D. Marenduzzo
Dense suspensions of soft colloidal particles display a broad range of physical and rheological properties which are still far from being fully understood. To elucidate the role of…
Dry active turbulence in microtubule-motor mixtures
Ivan Maryshev, Andrew B. Goryachev, Davide Marenduzzo +1
We study the dynamics and phase behaviour of a dry suspension of microtubules and molecular motors. We obtain a set of continuum equations by rigorously coarse graining a microscop…
The mechanism of propulsion of a model microswimmer in a viscoelastic fluid next to a solid boundary
Thomas R. Ives, Alexander Morozov
In this paper we study swimming of a model organism, the so-called Taylor's swimming sheet, in a viscoelastic fluid close to a solid boundary. This situation comprises natural habi…
Density Dependent Cohesion Leads to Controlled Phase Separation in Brownian Suspensions
Gavin Melaugh, Davide Marenduzzo, Alexander Morozov +1
Mechanical interactions between biological cells may be mediated by secreted products, making them dependent on the local particle density. Here, we explore the generic physics of…
Kinetic theory of pattern formation in mixtures of microtubules and molecular motors
Ivan Maryshev, Davide Marenduzzo, Andrew B. Goryachev +1
In this study we formulate a theoretical approach, based on a Boltzmann-like kinetic equation, to describe pattern formation in two-dimensional mixtures of microtubular filaments a…