385 citations · 828 across the 32 of their papers we have counts for
33 papers
Seat pan angle optimization for vehicle ride comfort using finite element model of human spine
Raj Desai, Ankit Vekaria, Anirban Guha +1
Ride comfort of the driver/occupant of a vehicle has been usually analyzed by multibody biodynamic models of human beings. Accurate modeling of critical segments of the human body,…
5-wave interactions in inertia-gravity waves
Saranraj Gururaj, Anirban Guha
In oceans, multiple energetic inertia-gravity waves often coexist in a region. In this paper, we study the stability of two coexisting plane inertia-gravity waves (hereafter, prima…
Understanding Stokes drift mechanism via crest and trough phase estimates
Anirban Guha, Akanksha Gupta
By providing mathematical estimates, this paper answers a fundamental question -- "what leads to Stokes drift"? Although overwhelmingly understood for water waves, Stokes drift is…
A new Lagrangian drift mechanism due to current-bathymetry interactions: applications in coastal cross-shelf transport
Akanksha Gupta, Anirban Guha
We show that in free surface flows, a uniform, streamwise current over small-amplitude wavy bottom topography generates cross-stream drift velocity. This drift mechanism, referred…
Resonant and near-resonant internal wave triads for non-uniform stratifications. Part 2: Vertically bounded domain with mild-slope bathymetry
Saranraj Gururaj, Anirban Guha
Weakly nonlinear internal wave-wave interaction is a key mechanism that cascades energy from large to small scales, leading to ocean turbulence and mixing. Oceans typically have a…
Pairs of surface wave packets with zero-sum energy in the Hawking radiation analog
Anirban Guha, Eyal Heifetz, Akanksha Gupta
Here we propose a minimal analog gravity setup and suggest how to select two surface gravity wave packets in order to mimic some key aspects of Hawking radiation from the horizon o…
Wave interactions in neutrally stable shear layers: regular and singular modes, and non-modal growth
Eyal Heifetz, Anirban Guha, Jeff Carpenter
In a recent letter, Carpenter and Guha (2019) compared the neutral modes of a smooth two dimensional shear profile without an inflection point to the modes of its corresponding pie…
Modified Stokes drift due to surface waves and corrugated sea-floor interactions with and without a mean current
Akanksha Gupta, Anirban Guha
In this paper, we show that Stokes drift may be significantly affected when an incident intermediate or shallow water surface wave travels over a corrugated sea-floor. The underlyi…
Predicting vortex merging and ensuing turbulence characteristics in shear layers from initial conditions
Anirban Guha, Mona Rahmani
Unstable shear layers in environmental and industrial flows roll up into a series of vortices, which often form complex nonlinear merging patterns like pairs and triplets. These pa…
The motion of buoyant point vortices
Jeff Carpenter, Anirban Guha
A general formulation is presented for studying the motion of buoyant vortices in a homogeneous ambient fluid. It extends the well-known Hamiltonian framework for interacting homog…
On the opposing roles of the Boussinesq and non-Boussinesq baroclinic torques in surface gravity wave propagation
Eyal Heifetz, Ron Maor, Anirban Guha
Here we suggest an alternative understanding of the surface gravity wave propagation mechanism based on the baroclinic torque, which operates to translate the interfacial vorticity…
Similarities between the structure functions of thermal convection and hydrodynamic turbulence
Shashwat Bhattacharya, Shubhadeep Sadhukhan, Anirban Guha +1
In this paper, we analyze the scaling of velocity structure functions of turbulent thermal convection. Using high-resolution numerical simulations, we show that the structure funct…
On the normal form of synchronization and resonance between vorticity waves in shear flow instability
Eyal Heifetz, Anirban Guha
A central mechanism of linearised two dimensional shear instability can be described in terms of a nonlinear, action-at-a-distance, phase-locking resonance between two vorticity wa…
Revisiting Bolgiano-Obukhov scaling for moderately stably stratified turbulence
Shadab Alam, Anirban Guha, Mahendra K. Verma
According to the celebrated Bolgiano--Obukhov \citep{Bolgiano_1959,Obukhov_1959} phenomenology for moderately stably stratified turbulence, the energy spectrum in the inertial rang…
An inverse technique for reconstructing ocean's density stratification from surface data
Subhajit Kar, Anirban Guha
In this article, we propose an inverse technique that accurately reconstructs the ocean's density stratification profile simply from free surface elevation data. Satellite observat…
Explosive instability due to flow over a rippled bottom
Raunak Raj, Anirban Guha
In this paper, we study Bragg resonance, i.e. the triad interaction between surface and/or interfacial waves with bottom ripple, in presence of background velocity. We show that wh…
Energy transfer in resonant and near-resonant internal wave triads for weakly non-uniform stratifications. Part I: Unbounded domain
G. Saranraj, Anirban Guha
In this paper, using multiple scale analysis we derive a generalized mathematical model for amplitude evolution, and for calculating the energy exchange in resonant and near-resona…
Failure of Nielsen-Ninomiya theorem and fragile topology in two-dimensional systems with space-time inversion symmetry: application to twisted bilayer graphene at magic angle
Junyeong Ahn, Sungjoon Park, Bohm-Jung Yang
We show that the Wannier obstruction and the fragile topology of the nearly flat bands in twisted bilayer graphene at magic angle are manifestations of the nontrivial topology of t…
Ocean bathymetry reconstruction from surface data using hydraulics theory
Subhajit Kar, Anirban Guha
Here we propose a technique that successfully reconstructs ocean bathymetry from the free surface velocity and elevation data. This technique is based on the principles of open-cha…
Large density stratification stabilizes Rayleigh-Taylor instability in presence of shear
Raunak Raj, Anirban Guha
This letter investigates the effect of shear on Rayleigh-Taylor instability (RTI). Even simple uniform shear strongly influences the instability; longer waves are completely stabil…
On the inertial effects of density variation in stratified shear flows
Anirban Guha, Raunak Raj
In this paper, we first revisit the celebrated Boussinesq approximation in stratified flows. Using scaling arguments we show that when the background shear is weak, the Boussinesq…
Nonlinear modeling of wave-topography interactions, shear instabilities and shear induced wave breaking using vortex method
Divyanshu Bhardwaj, Anirban Guha
Theoretical studies on linear shear instabilities often use simple velocity and density profiles (e.g. constant, piecewise) for obtaining good qualitative and quantitative predicti…
Effect of free surface on submerged stratified shear instabilities
Mihir H. Shete, Anirban Guha
Here we have considered the effects of shallowness of the domain as well as the air-water free surface on the stratified shear instabilities of the fluid underneath. First, we nume…
A generalized action-angle representation of wave interaction in stratified shear flows
Eyal Heifetz, Anirban Guha
In this paper we express the linearized dynamics of interacting interfacial waves in stratified shear flows in the compact form of action-angle Hamilton equations. The pseudo-energ…