36 citations · 169 across the 14 of their papers we have counts for
14 papers
Rate of formation of caustics in heavy particles advected by turbulence
Akshay Bhatnagar, Vikash Pandey, Prasad Perlekar +1
The rate of collision and the relative velocities of the colliding particles in turbulent flows is a crucial part of several natural phenomena, e.g., rain formation in warm clouds…
Inertial Particles in Superfluid Turbulence: Coflow and Counterflow
Sanjay Shukla, Akhilesh Kumar Verma, Vishwanath Shukla +2
We use pseudospectral direct numerical simulations (DNSs) to solve the three-dimensional (3D) Hall-Vinen-Bekharevich-Khalatnikov (HVBK) model of superfluid Helium. We then explore…
Coagulation drives turbulence in binary fluid mixtures
Akshay Bhatnagar, Prasad Perlekar, Dhrubaditya Mitra
We use direct numerical simulations and scaling arguments to study coarsening in binary fluid mixtures with a conserved order parameter in the droplet-spinodal regime -- the volume…
Paths to caustic formation in turbulent aerosols
Jan Meibohm, Vikash Pandey, Akshay Bhatnagar +4
The dynamics of small, yet heavy, identical particles in turbulence exhibits singularities, called caustics, that lead to large fluctuations in the spatial particle-number density,…
Statistics of relative velocity for particles settling under gravity in a turbulent flow
Akshay Bhatnagar
We study the joint probability distributions of separation, , and radial component of the relative velocity, , of particles settling under gravity in a turbulent flow…
The spreading of viruses by airborne aerosols: lessons from a first-passage-time problem for tracers in turbulent flows
Akhilesh Kumar Verma, Akshay Bhatnagar, Dhrubaditya Mitra +1
We study the spreading of viruses, such as SARS-CoV-2, by airborne aerosols, via a new first-passage-time problem for Lagrangian tracers that are advected by a turbulent flow: By d…
Lagrangian Irreversibility and Eulerian Dissipation in Fully-Developed Turbulence
Jason R. Picardo, Akshay Bhatnagar, Samriddhi Sankar Ray
We revisit the issue of Lagrangian irreversibility in the context of recent results [Xu, et al., PNAS, 111, 7558 (2014)] on flight-crash events in turbulent flows and show how extr…
Clustering and dynamic decoupling of dust grains in turbulent molecular clouds
Lars Mattsson, Akshay Bhatnagar, Fred A. Gent +1
We present high resolution () simulations of super-/hyper-sonic isothermal hydrodynamic turbulence inside an interstellar molecular cloud (resolving scales of typically 20…
Relative velocities in bi-disperse turbulent aerosols: simulations and theory
Akshay Bhatnagar, K. Gustavsson, B. Mehlig +1
We perform direct numerical simulations of a bi-disperse suspension of heavy spherical particles in forced, homogeneous, and isotropic three-dimensional turbulence. We compute the…
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…
Statistics of the relative velocity of particles in turbulent flows : monodisperse particles
Akshay Bhatnagar, K. Gustavsson, Dhrubaditya Mitra
We use direct numerical simulations to calculate the joint probability density function of the relative distance and relative radial velocity component for a pair of heav…
Lagrangian Statistics for Navier-Stokes Turbulence under Fourier-mode reduction: Fractal and Homogeneous Decimations
Michele Buzzicotti, Akshay Bhatnagar, Luca Biferale +2
We study small-scale and high-frequency turbulent fluctuations in three-dimensional flows under Fourier-mode reduction. The Navier-Stokes equations are evolved on a restricted set…
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…
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…