81 citations · 474 across the 25 of their papers we have counts for
26 papers
Irreversiblity in Bacterial Turbulence: Insights from the Mean-Bacterial-Velocity Model
Kolluru Venkata Kiran, Anupam Gupta, Akhilesh Kumar Verma and +1
We use the mean-bacterial-velocity model to investigate the \textit{irreversibility} of two-dimensional (2D) \textit{bacterial turbulence} and to compare it with its 2D fluid-turbu…
Flocking of Active Particles in a Turbulent Flow
Anupam Gupta, Amal Roy, Arnab Saha +1
We investigate the effect of cooperative interactions in an ensemble of microorganisms, modelled as self-propelled disk-like and rod-like particles, in a three-dimensional turbulen…
Conditional stability of particle alignment in finite-Reynolds-number channel flow
Anupam Gupta, Pascale Magaud, Christine Lafforgue +1
Finite-size neutrally buoyant particles in a channel flow are known to accumulate at specific equilibrium positions or spots in the channel cross-section if the flow inertia is fin…
Effect of polymer-stress diffusion in the numerical simulation of elastic turbulence
Anupam Gupta, Dario Vincenzi
Elastic turbulence is a chaotic regime that emerges in polymer solutions at low Reynolds numbers. A common way to ensure stability in numerical simulations of polymer solutions is…
Inertial spheroids in homogeneous, isotropic turbulence
Amal Roy, Anupam Gupta, Samriddhi Sankar Ray
We study the rotational dynamics of {\it inertial} disks and rods in three-dimensional, homogeneous isotropic turbulence. In particular, we show how the alignment and the decorrela…
Heavy inertial particles in turbulent flows gain energy slowly but lose it rapidly
Akshay Bhatnagar, Anupam Gupta, Dhrubaditya Mitra +1
We present an extensive numerical study of the time irreversibility of the dynamics of heavy inertial particles in three-dimensional, statistically homogeneous and isotropic turbul…
The role of BKM-type theorems in Euler, Navier-Stokes and Cahn-Hilliard-Navier-Stokes analysis
John D. Gibbon, Anupam Gupta, Nairita Pal +1
The Beale-Kato-Majda theorem contains a single criterion that controls the behaviour of solutions of the incompressible Euler equations. Versions of this theorem are discussed…
The statistical properties of spiral- and scroll-wave turbulence in cardiac tissue
K. V. Rajany, Anupam Gupta, Alexander V. Panfilov +1
Disorganized electrical activity in the heart leads to sudden cardiac death. To what extent can this electrical turbulence be viewed as classical fluid turbulence,which is an impor…
Lyapunov dimension of elastic turbulence
Emmanuel Lance Christopher VI Medillo Plan, Anupam Gupta, Dario Vincenzi +1
Low-Reynolds-number polymer solutions exhibit a chaotic behaviour known as 'elastic turbulence' when the Weissenberg number exceeds a critical value. The two-dimensional Oldroyd-B…
Droplet breakup driven by shear thinning solutions in a microfluidic T-Junction
Enrico Chiarello, Anupam Gupta, Giampaolo Mistura +2
Droplet-based microfluidics turned out to be an efficient and adjustable platform for digital analysis, encapsulation of cells, drug formulation, and polymerase chain reaction. Typ…
How long do particles spend in vortical regions in turbulent flows?
Akshay Bhatnagar, Anupam Gupta, Dhrubaditya Mitra +2
We obtain the probability distribution functions (PDFs) of the time that a Lagrangian tracer or a heavy inertial particle spends in vortical or strain-dominated regions of a turbul…
A regularity criterion for solutions of the three-dimensional Cahn-Hilliard-Navier-Stokes equations and associated computations
John D. Gibbon, Nairita Pal, Anupam Gupta +1
We consider the 3D Cahn-Hilliard equations coupled to, and driven by, the forced, incompressible 3D Navier-Stokes equations. The combination, known as the Cahn-Hilliard-Navier-Stok…
Melting of a nonequilibrium vortex crystal in a fluid film with polymers : elastic versus fluid turbulence
Anupam Gupta, Rahul Pandit
We perform a direct numerical simulation (DNS) of the forced, incompressible two-dimensional Navier-Stokes equation coupled with the FENE-P equations for the polymer-conformation t…
Binary-Fluid Turbulence: Signatures of Multifractal Droplet Dynamics and Dissipation Reduction
Nairita Pal, Prasad Perlekar, Anupam Gupta +1
We present an extensive direct numerical simulation of statistically steady, homogeneous, isotropic turbulence in two-dimensional, binary-fluid mixtures with air-drag-induced frict…
A Lattice Boltzmann study of the effects of viscoelasticity on droplet formation in microfluidic cross-junctions
Anupam Gupta, Mauro Sbragaglia
Based on mesoscale lattice Boltzmann (LB) numerical simulations, we investigate the effects of viscoelasticity on the break-up of liquid threads in microfluidic cross-junctions, wh…
Effects of viscoelasticity on droplet dynamics and break-up in microfluidic T-Junctions: a lattice Boltzmann study
Anupam Gupta, Mauro Sbragaglia
The effects of viscoelasticity on the dynamics and break-up of fluid threads in microfluidic T-junctions are investigated using numerical simulations of dilute polymer solutions at…
Universal Statistical Properties of Inertial-particle Trajectories in Three-dimensional, Homogeneous, Isotropic, Fluid Turbulence
Akshay Bhatnagar, Anupam Gupta, Dhrubaditya Mitra +2
We uncover universal statistical properties of the trajectories of heavy inertial particles in three-dimensional, statistically steady, homogeneous, and isotropic turbulent flows b…
Deformation and break-up of viscoelastic droplets Using Lattice Boltzmann Models
Anupam Gupta, Mauro Sbragaglia
We investigate the break-up of Newtonian/viscoelastic droplets in a viscoelastic/Newtonian matrix under the hydrodynamic conditions of a confined shear flow. Our numerical approach…
Homogeneous Isotropic Superfluid Turbulence in Two Dimensions: Inverse and Forward Cascades in the Hall-Vinen-Bekharevich-Khalatnikov model
Vishwanath Shukla, Anupam Gupta, Rahul Pandit
We present the first direct-numerical-simulation study of the statistical properties of two-dimensional superfluid turbulence in the Hall-Vinen-Bekharevich-Khalatnikov two-fluid mo…
Statistical Properties of the Intrinsic Geometry of Heavy-particle Trajectories in Two-dimensional, Homogeneous, Isotropic Turbulence
Anupam Gupta, Dhrubaditya Mitra, Prasad Perlekar +1
We obtain, by extensive direct numerical simulations, trajectories of heavy inertial particles in two-dimensional, statistically steady, homogeneous, and isotropic turbulent flows,…
Regimes of nonlinear depletion and regularity in the 3D Navier-Stokes equations
John D. Gibbon, Diego A. Donzis, Anupam Gupta +3
The periodic Navier-Stokes equations are analyzed in terms of dimensionless, scaled, -norms of vorticity (). The first in this hierarchy, $D…
Elliptical Tracers in Two-dimensional, Homogeneous, Isotropic Fluid Turbulence: the Statistics of Alignment, Rotation, and Nematic Order
Anupam Gupta, Dario Vincenzi, Rahul Pandit
We study the statistical properties of orientation and rotation dynamics of elliptical tracer particles in two-dimensional, homogeneous and isotropic turbulence by direct numerical…
Vorticity moments in four numerical simulations of the 3D Navier-Stokes equations
D. Donzis, J. D. Gibbon, A. Gupta +3
The issue of intermittency in numerical solutions of the 3D Navier-Stokes equations on a periodic box is addressed through four sets of numerical simulations that cal…
Two-dimensional, homogeneous, isotropic fluid turbulence with polymer additives
Anupam Gupta, Prasad Perlekar, Rahul Pandit
We present the most extensive direct numerical simulations, attempted so far, of statistically steady, homogeneous, isotropic turbulence in two-dimensional fluid films with air-dra…