108 citations · 590 across the 23 of their papers we have counts for
24 papers
Inertial migration of a neutrally buoyant spheroid in plane Poiseuille flow
Prateek Anand, Ganesh Subramanian
We study the cross-stream inertial migration of a torque-free neutrally buoyant spheroid, of an arbitrary aspect ratio , in wall-bounded plane Poiseuille flow for small particle…
Inertial migration in pressure-driven channel flow: beyond the Segre-Silberberg pinch
Prateek Anand, Ganesh Subramanian
We examine theoretically the inertial migration of a neutrally buoyant rigid sphere in pressure-driven channel flow, accounting for its finite size relative to the channel width (t…
Anomalous dispersion of microswimmer populations
Laxminarsimharao Vennamneni, Piyush Garg, Ganesh Subramanian
We examine the longitudinal dispersion of spheroidal microswimmers in pressure-driven channel flow. When time scales corresponding to swimmer orientation relaxation, and diffusion…
Inertial migration of a sphere in plane Couette flow
Prateek Anand, Ganesh Subramanian
We study the inertial migration of a torque-free neutrally buoyant sphere in wall-bounded plane Couette flow over a wide range of channel Reynolds numbers, , in the limit of…
The geometry of planar linear flows
Sabarish V Narayanan, Ganesh Subramanian
We identify incompressible planar linear flows that are generalizations of the well known one-parameter family characterized by the ratio of in-plane extension to (out-of-plane) vo…
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…
Two-fluid kinetic theory for dilute polymer solutions
Shiwani Singh, Ganesh Subramanian, Santosh Ansumali
We provide a Boltzmann-type kinetic description for dilute polymer solutions based on two-fluid theory. This Boltzmann-type description uses a quasi-equilibrium based relaxation me…
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…
Motion of a sphere in a viscous density stratified fluid
Arun Kumar Varanasi, Ganesh Subramanian
We examine the translation of a sphere in a stably stratified ambient in the limit of small Reynolds () and viscous Richardson numbers (); here, $Re = \frac{ρ…
Linear stability of a rotating liquid column revisited
Pulkit Dubey, Anubhab Roy, Ganesh Subramanian
We revisit the somewhat classical problem of the linear stability of a rigidly rotating liquid column in this communication. Although literature pertaining to this problem dates ba…
A continuous pathway between the elasto-inertial and elastic turbulent states in viscoelastic channel flow
Mohammad Khalid, V. Shankar, Ganesh Subramanian
We show that viscoelastic plane Poiseuille flow becomes linearly unstable in the absence of inertia, in the limit of high elasticities, for ultra-dilute polymer solutions. While in…
The rotation of a sedimenting anisotropic particle in a linearly stratified ambient
Arun Kumar Varanasi, Navaneeth K. Marath, Ganesh Subramanian
We derive the torque on a spheroid of an arbitrary aspect ratio sedimenting in a linearly stratified ambient. The analysis demarcates regions in parameter space corresponding t…
Inertio-elastic instability of a vortex column
Anubhab Roy, Piyush Garg, Jhumpal Shashikiran Reddy +1
We analyze the instability of a vortex column in a dilute polymer solution at large and with , the elasticity num…
The center-mode instability of viscoelastic plane Poiseuille flow
Mohammad Khalid, Indresh Chaudhary, Piyush Garg +2
A modal stability analysis shows that plane Poiseuille flow of an Oldroyd-B fluid becomes unstable to a `center mode' with phase speed close to the maximum base-flow velocity, $U_{…
An anisotropic particle in a simple shear flow: an instance of chaotic scattering
Mahan Raj Banerjee, Ganesh Subramanian
In the Stokesian limit, the streamline topology around a single neutrally buoyant sphere is identical to the topology of pair-sphere pathlines, both in an ambient simple shear flow…
Linear instability of viscoelastic pipe flow
Indresh Chaudhary, Piyush Garg, Ganesh Subramanian +1
A modal stability analysis shows that pressure-driven pipe flow of an Oldroyd-B fluid is linearly unstable to axisymmetric perturbations, in stark contrast to its Newtonian counter…
Orientation Dynamics of Sedimenting Anisotropic Particles in Turbulence
Prateek Anand, Samriddhi Sankar Ray, Ganesh Subramanian
We examine the dynamics of small anisotropic particles (spheroids) sedimenting through homogeneous isotropic turbulence using direct numerical simulations and theory. The gravity-i…
Shear induced migration of microswimmers in pressure-driven channel flow
LaxminarsimhaRao V., Sankalp Nambiar, Ganesh Subramanian
We study the shear induced migration of microswimmers (primarily, active Brownian particles or ABP's) in a plane Poiseuille flow. For wide channels characterized by $U_b/HD_r \ll 1…
Enhanced velocity fluctuations in interacting swimmer suspensions
Sankalp Nambiar, Piyush Garg, Ganesh Subramanian
A dilute non-interacting suspension of micro-swimmers exhibits a finite velocity variance and short-ranged correlations that decay over a swimmer length. For a suspension of intera…
Stress relaxation in a dilute bacterial suspension: The active-passive transition
Sankalp Nambiar, Phanikanth S, Nott P. R. +1
We analyse the time dependent non-linear rheology of a dilute bacterial suspension (e.g. E. coli) for a pair of impulsively started linear flows - simple shear and uniaxial extensi…
Concentration banding instability of a sheared bacterial suspension
Laxminarsimharao V, Piyush Garg, Ganesh Subramanian
We demonstrate a novel shear-induced mechanism for growth of concentration fluctuations in a bacterial suspension. Using a linear stability analysis, a homogeneously sheared suspen…
Viscoelastic pipe flow is linearly unstable
Piyush Garg, Indresh Chaudhary, Mohammad Khalid +2
Newtonian pipe flow is known to be linearly stable at all Reynolds numbers. We report, for the first time, a linear instability of pressure driven pipe flow of a viscoelastic fluid…
Stochastic dynamics of active swimmers in linear flows
Mario Sandoval, Navaneeth K. M., Ganesh Subramanian +1
Most classical work on the hydrodynamics of low-Reynolds-number swimming addresses deterministic locomotion in quiescent environments. Thermal fluctuations in fluids are known to l…
Coupling between quantum Hall state and electromechanics in suspended graphene resonator
Vibhor Singh, Bushra Irfan, Ganesh Subramanian +6
Using graphene resonator, we perform electromechanical measurements in quantum Hall regime to probe the coupling between a quantum Hall (QH) system and its mechanical motion. Mecha…