Kelvin-Helmholtz instability in dusty plasma medium: Fluid and particle approach

2014 ◽  
Vol 80 (6) ◽  
pp. 817-823 ◽  
Author(s):  
Sanat Tiwari ◽  
Vikram Dharodi ◽  
Amita Das ◽  
Predhiman Kaw ◽  
Abhijit Sen
Keyword(s):  
Dusty Plasma ◽  
Md Simulation ◽  
Temporal Evolution ◽  
Yukawa Potential ◽  
Coupling Parameter ◽  
Plasma Medium ◽  
Helmholtz Instability ◽  
Strongly Coupled ◽  
Strongly Coupled Dusty Plasma ◽  
Particle Approach

The Kelvin-Helmholtz (KH) instability is studied in a two dimensional strongly coupled dusty plasma medium using a fluid approach as well as through a molecular dynamic (MD) simulation. For the fluid description the generalized hydrodynamic (GH) model which treats the strongly coupled dusty plasma as a visco-elastic fluid is adopted. For the MD studies the ensemble of particles are assumed to interact through a Yukawa potential. Both the approaches predict a stabilization of the KH growth rate with an increase in the strong coupling parameter. The present study also delineates the temporal evolution and the interaction of transverse shear waves with the collective dynamics of the dusty plasma medium within the framework of both these approaches.

Kelvin-Helmholtz instability in a strongly coupled dusty plasma medium

2012 ◽  
Vol 19 (7) ◽  
pp. 073703 ◽  
Author(s):  
Sanat Kumar Tiwari ◽  
Amita Das ◽  
Dilip Angom ◽  
Bhavesh G. Patel ◽  
Predhiman Kaw
Keyword(s):  
Dusty Plasma ◽  
Plasma Medium ◽  
Helmholtz Instability ◽  
Strongly Coupled ◽  
Strongly Coupled Dusty Plasma

Collective dynamics in strongly coupled dusty plasma medium

2014 ◽  
Vol 80 (6) ◽  
pp. 855-861 ◽  
Author(s):  
Amita Das ◽  
Vikram Dharodi ◽  
Sanat Tiwari
Keyword(s):  
Dusty Plasma ◽  
Fluid Model ◽  
Elastic Behaviour ◽  
Dynamical Response ◽  
Plasma Medium ◽  
Mixing Properties ◽  
Strongly Coupled ◽  
Transport And Mixing ◽  
Strongly Coupled Dusty Plasma

A simplified description of dynamical response of strongly coupled medium is desirable in many contexts of physics. The dusty plasma medium can play an important role in this regard due to its uniqueness, as its dynamical response typically falls within the perceptible grasp of human senses. Furthermore, even at room temperature and normal densities it can be easily prepared to be in a strongly coupled regime. A simplified phenomenological fluid model based on the visco - elastic behaviour of the medium is often invoked to represent the collective dynamical response of a strongly coupled dusty plasma medium. The manuscript reviews the role of this particular Generalized Hydrodynamic (GHD) fluid model in capturing the collective properties exhibited by the medium. In addition the paper also provides new insights on the collective behaviour predicted by the model for the medium, in terms of coherent structures, instabilities, transport and mixing properties.

scholarly journals A numerical study of gravity-driven instability in strongly coupled dusty plasma. Part 1. Rayleigh–Taylor instability and buoyancy-driven instability

2021 ◽  
Vol 87 (2) ◽  
Author(s):  
Vikram S. Dharodi ◽  
Amita Das
Keyword(s):  
Dusty Plasma ◽  
Numerical Study ◽  
Fluid Model ◽  
Density Region ◽  
Strongly Coupled ◽  
Rising Bubble ◽  
Inhomogeneous Density ◽  
Gravity Driven ◽  
The Individual ◽  
Strongly Coupled Dusty Plasma

Rayleigh–Taylor (RT) and buoyancy-driven (BD) instabilities are driven by gravity in a fluid system with inhomogeneous density. The paper investigates these instabilities for a strongly coupled dusty plasma medium. This medium has been represented here in the framework of the generalized hydrodynamics (GHD) fluid model which treats it as a viscoelastic medium. The incompressible limit of the GHD model is considered here. The RT instability is explored both for gradual and sharp density gradients stratified against gravity. The BD instability is discussed by studying the evolution of a rising bubble (a localized low-density region) and a falling droplet (a localized high-density region) in the presence of gravity. Since both the rising bubble and falling droplet have symmetry in spatial distribution, we observe that a falling droplet process is equivalent to a rising bubble. We also find that both the gravity-driven instabilities get suppressed with increasing coupling strength of the medium. These observations have been illustrated analytically as well as by carrying out two-dimensional nonlinear simulations. Part 2 of this paper is planned to extend the present study of the individual evolution of a bubble and a droplet to their combined evolution in order to understand the interaction between them.

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