42 citations · 75 across the 11 of their papers we have counts for
9 papers · 1 filter
Effect of Weak Non-Conservative Dynamics on Pattern Formation in Scalar Active Matter
Sameer Kumar
Biological systems such as bacteria and cells undergo growth or degradation, resulting in weak violations of mass conservation. We investigate how such weak non-conservative dynami…
Defect Localization by Vanishing Deviatoric Stress in Active Nematics
Sameer Kumar, Manas Khan
Collective stress generation in cellular monolayers is a key phenomenological process governing coordinated migration and emergent multicellular dynamics. We employ a generic activ…
Hydrodynamic bend instability of motile particles on a substrate
Sameer Kumar, Niels de Graaf Sousa, Amin Doostmohammadi
The emergence of hydrodynamic bend instabilities in ordered suspensions of active particles is widely observed across diverse living and synthetic systems, and is considered to be…
Active nematic gel with quenched disorder
Sameer Kumar, Shradha Mishra
With quenched disorder, we introduce two-dimensional active nematics suspended in an incompressible fluid. We write the coarse-grained hydrodynamic equations of motion for slow var…
Bond disorder enhances the information transfer in polar flock
Jay Prakash Singh, Sameer Kumar, Shradha Mishra
Collection of self-propelled particles (SPPs) exhibit coherent motion and show true long-range order in two-dimensions. Inhomogeneity, in general destroys the usual long-range orde…
Effect of polydispersity on the dynamics of active Brownian particles
Sameer Kumar, Jay Prakash Singh, Debaprasad Giri +1
We numerically study the dynamics and the phases of self-propelled disk-shaped particles of different sizes with soft repulsive potential in two dimensions. Size diversity is intro…
Active nematics with quenched disorder
Sameer Kumar, Shradha Mishra
We introduce a two-dimensional active nematic with quenched disorder. We write the coarse-grained hydrodynamic equations of motion for slow variables, viz. density, and orientation…
Dynamics of a particle moving in a two dimensional Lorentz lattice gas
Pranay Bimal Sampat, Sameer Kumar, Shradha Mishra
We study the dynamics of a particle moving in a square two-dimensional Lorentz lattice-gas. The underlying lattice-gas is occupied by two kinds of rotators, "right-rotator (R)" and…
Dynamics of particle moving in one dimensional Lorentz lattice gas
Sameer Kumar, Shradha Mishra
We study the dynamics of a particle moving in one-dimensional Lorentz lattice-gas where particle performs mainly three different kinds of motion {\it viz} ballistic motion, diffusi…