Kolmogorov flow in two dimensional strongly coupled dusty plasma

Gupta, Akanksha; Ganesh, R.; Joy, Ashwin

doi:10.1063/1.4890488

Cited by 14 publications

(11 citation statements)

References 24 publications

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“…We have developed an Open‐MP parallel two‐dimensional multiparticle MC code using the above‐mentioned algorithm and benchmarked it with the existing MD code as well as the MPMD‐2D code . We reproduce the two‐dimensional pair‐correlation function of the dusty plasma both in liquid and solid states, as previously obtained from both the codes.…”

Section: Benchmarking With Monte Carlo Simulationmentioning

confidence: 99%

Measurement of temperature of a dusty plasma from its configuration

Mukherjee

Jaiswal

Shukla

et al. 2020

Contributions to Plasma Physics

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A new concept called "configurational temperature" is introduced in the context of dusty plasma, where the temperature of the dust particles submerged in the plasma can be measured directly from the positional information of the individual dust particles and the interaction potential between the dust grains.This method does not require the velocity information of individual particles, which is a key parameter to measure the dust temperature in the conventional method. The technique is initially tested using two-dimensional (2D) OpenMP parallel molecular dynamics and Monte Carlo simulation and then compared with the temperature evaluated from experimental data. The experiment have been carried out in the Dusty Plasma Experimental (DPEx) device, where a 2D stationary plasma crystal of melamine formaldehyde particles is formed in the cathode sheath of a DC glow discharge argon plasma. The kinetic temperature of the dust is calculated using the standard particle image velocimetry technique at different pressures. An extended simulation result for the three-dimensional case is also presented, which can be employed for the temperature measurement of a three-dimensional dust crystal in laboratory devices. K E Y W O R D Sconfigurational temperature, dusty plasma, dusty plasma experiment, molecular dynamics, Monte-Carlo simulation, simulation

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Section: Benchmarking With Monte Carlo Simulationmentioning

confidence: 99%

Measurement of temperature of a dusty plasma from its configuration

Mukherjee

Jaiswal

Shukla

et al. 2020

Contributions to Plasma Physics

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“…For a memory based fluid, the energy transfer process gets significantly altered. The dynamics of such a viscoelastic fluid in the presence of shear has been already found to be quite different from that of a well‐known Newtonian fluid …”

Section: Introductionmentioning

confidence: 97%

“…The generalized hydrodynamic (GHD) model has been proven to be one of the most successful models to describe the dynamics of such a medium. The model aptly takes care of the viscoelastic nature of the fluid through an additional time‐derivative in the momentum equation.…”

Section: Introductionmentioning

confidence: 99%

“…The dynamics of such a viscoelastic fluid in the presence of shear has been already found to be quite different from that of a well-known Newtonian fluid. [12][13][14][15][16] The evolution of coherent localized vortex structures is a very fundamental problem in the field of quasi-geotrophic and astrophysical phenomena. [26] In case of a turbulent flow driven at any intermediate scale, the merging of vortices producing larger vortex structure, fundamentally bifurcates the study from its three dimensional counterpart.…”

Section: Introductionmentioning

confidence: 99%

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Viscoelastic effects on asymmetric two‐dimensional vortex patterns in a strongly coupled dusty plasma

Gupta

Mukherjee

Ganesh

2019

Contributions to Plasma Physics

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Strongly coupled dusty plasma medium is often described as a viscoelastic fluid that retains its memory. In a flowing dusty plasma medium, vortices of different sizes appear when the flow does not remain laminar. The vortices also merge to transfer energy between different scales. In the present work, we study the effect of viscoelasticity and compressibility over a localized vortex structure and multiple rotational vortices in a strongly coupled viscoelastic dusty plasma medium. In case of single rotating vortex flow, a transverse wave is generated from the localized vortex source and the evolution time of generated waves is found to be reduced due to finite viscoelasticity and compressibility of the medium. It is found that the viscoelasticity suppresses the dispersion of vorticity. In the presence of multiple vortices, we find, the vortex mergers get highly affected in the presence of memory effect of the fluid, and thus the dynamics of the medium gets completely altered compared to a non‐viscoelastic fluid. For a compressible fluid, viscoelasticity dampens the energy in the sonic waves generated in the medium. Thus a highly viscoelastic and compressible fluid, in some cases, behaves similarly to an incompressible viscoelastic fluid. The wave‐front like rings propagate in elliptical orbits keeping the footprint of the earlier position of the point‐vortex. The rings collide with each other even within the patch vortex region forming regions of high vorticity at the point of intersection and pass through each other.

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“…Several authors have recently begun to study turbulence in complex plasmas [30,[36][37][38]. Using complex plasmas to study turbulence has the advantage that the particles that carry the interaction can be visualized individually, in contrast to traditional experiments on turbulence [18,39,40], in which the use of tracer particles might not be reliable [41].…”

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confidence: 99%

Instability onset and scaling laws of an auto-oscillating turbulent flow in a complex plasma

2017

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We study a complex plasma under microgravity conditions that is first stabilized with an oscillating electric field. Once the stabilization is stopped, the so-called heartbeat instability develops. We study how the kinetic energy spectrum changes during and after the onset of the instability and compare with the double cascade predicted by Kraichnan and Leith for two-dimensional turbulence. The onset of the instability manifests clearly in the ratio of the reduced rates of cascade of energy and enstrophy and in the power-law exponents of the energy spectra. In general, when energy is put into a two-dimensional turbulent system, the energy spectrum splits into the inverse energy and direct enstrophy ranges -the so-called double cascade develops [10,11]. Its presence has been supported by computer simulations, but not unambiguously [12,13]. Only a few numerical simulations [14][15][16] and experiments [12,17,18] were able to simultaneously observe both cascades, which is challenging due to the large range of scales necessary to cover both the inverse and direct cascade [19]. Recently, it was suggested that the inverse cascade might not be robust, but depend on friction [16,20]. The evolution of the spectrum during the onset of two-dimensional forced turbulence was investigated in [21]. A recent topic of interest is the transition of weak wave turbulence to wave turbulence with intermittent collapses [22] and intermittency, i.e. strong nonGaussian velocity fluctuations, in wave turbulence [23][24][25][26], and so-called Janus spectra which differ in streamwise and transverse direction [27].In this paper, we present the first study of developing turbulence in dusty/complex plasmas. Complex plasmas consist of microparticles embedded in a low-temperature plasma. The microparticles acquire high charges and interact with each other. They can be visualized individually and thus enable observations on the kinetic level of, for instance, vortices [28][29][30], tunneling [31], and channeling [32]. Gravity is a major force acting on the microparticles in ground-based experiments. Under its influence, the particles are located close to the sheath region of

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Kolmogorov flow in two dimensional strongly coupled dusty plasma

Cited by 14 publications

References 24 publications

Measurement of temperature of a dusty plasma from its configuration

Measurement of temperature of a dusty plasma from its configuration

Viscoelastic effects on asymmetric two‐dimensional vortex patterns in a strongly coupled dusty plasma

Instability onset and scaling laws of an auto-oscillating turbulent flow in a complex plasma

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