15 papers
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…