Equilibrium molecular dynamics simulation of shear viscosity of two-dimensional complex (dusty) plasmas

Shahzad, Aamir; Aslam, Arffa; He, Maogang

doi:10.1080/10420150.2014.968852

Cited by 15 publications

(17 citation statements)

References 17 publications

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“…It is noted that our simulation results are in better accordance with the earlier known numerical simulation results of 2D Yukawa liquids, at N =400 [22]. It has investigated that, our new calculations for λ 0 at the lower value of coupling Г ( 20) are lower than that of GK-EMD of Khrustalyov and Vaulina (KV) at the higher factor of scaling ξ = ∞ [27], and higher than 2D-NEMD estimations of Hou and Piel [26]. It is important to note that a constant behavior of λ 0 has examined at intermediate -higher Coulomb couplings (50 ≤ Г ≤ 500) at constant force field F * 0.02 [11], and well agreed with the previously known 2D SCDPs numerical simulation results of GKR-EMD [27] and NEMD [26] estimations.…”

Section: Simulation Results and Discussionsupporting

confidence: 89%

“…We started from a well-known, the Green-Kubo relations (GKR S ) for the hydrodynamic transport coefficients of uncharged particles [18]. This important GKR S of pure liquids have applied to calculate the thermal conductivity of 2D and 3D SCCDP S [11,12,[19][20][21][22][23][24][25][26][27].…”

Section: Numerical Model and Algorithmmentioning

confidence: 99%

“…Mechanical work is performed through the externally applied force field F e t ðÞand thus the equilibrium cannot be maintained. In the above expression, α is the Gaussian thermostat multiplier that keeps the system temperature [15][16][17][18][19][20][21][22]28] and it is given as…”

Section: Numerical Model and Algorithmmentioning

confidence: 99%

“…In Eq. (8), J Q Z t ðÞis the z-component of the current heat vector and the external force field F e t ðÞ=(F Z ) [15][16][17][18][19][20][21][22]31]. In this study we have used the same method as employed in our earlier work of 3D strongly coupled dusty plasmas [11,12].…”

Section: Numerical Model and Algorithmmentioning

confidence: 99%

See 3 more Smart Citations

Thermal Conductivity of Dusty Plasmas through Molecular Dynamics Simulations

Shahzad¹,

Khan²,

Shakoori³

et al. 2020

Thermophysical Properties of Complex Materials

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The studies of strongly coupled complex plasmas are of significant in the area of science and technology. The plasma thermal conductivity strongly coupled (complex) plasmas is of significant in scientific technology, because it behaves as complex fluids. The two-dimensional (2D) plasma thermal conductivity of strongly coupled complex dusty plasmas (SCCDPs) has been investigated by using the homogenous nonequilibrium molecular dynamics (HNEMD) simulations, proposed by Evan-Gillan scheme, at higher screening parameter к. In our case, we have chosen particularly higher screening strength (к) for calculating plasma thermal conductivity. The new simulations of plasma thermal conductivity are computed over an extensive range of plasma states (Г, к) for suitable system sizes by applying the HNEMD simulation method at constant external force field strength (F * ). It is found that the plasma thermal conductivity of SCCDP S decreases by increasing plasma states (Г, к). The calculations show that the kinetic energy of SCCDP S depends upon the system temperature (1/Г) and it is independent of к for higher screening parameter. The new results of thermal conductivity obtained from an improved HNEMD algorithm are in satisfactory agreement with earlier known numerical results and experimental data for 2D SCCDP S . It is depicted that the HNEMD method is a powerful tool to calculate an accurate plasma thermal conductivity of 2D SCCDP S .

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Section: Simulation Results and Discussionsupporting

confidence: 89%

Section: Numerical Model and Algorithmmentioning

confidence: 99%

Section: Numerical Model and Algorithmmentioning

confidence: 99%

Section: Numerical Model and Algorithmmentioning

confidence: 99%

See 2 more Smart Citations

Thermal Conductivity of Dusty Plasmas through Molecular Dynamics Simulations

Shahzad¹,

Khan²,

Shakoori³

et al. 2020

Thermophysical Properties of Complex Materials

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“…Here Q is the charge on dust particle, r is the distance between interacting particles, λ D is Debye screening length that accounts for the screening of interaction of other plasma species and ε o is permittivity of free space. The scaling (dimensionless) parameters, which fully characterized the system, one is known as Coulomb coupling parameter [23],…”

Section: N ____mentioning

confidence: 99%

Numerical Approach to Dynamical Structure Factor of Dusty Plasmas

Shahzad¹,

Shakoori²,

He³

et al. 2019

Plasma Science and Technology - Basic Fundamentals and Modern Applications

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The dynamical structure factor [S(k,ω)] gives the information about static and dynamic properties of complex dusty plasma (CDPs). We have used the equilibrium molecular dynamic (EMD) simulations for the investigation of S(k,ω) of strongly coupled CDPs (SCCDPs). In this work, we have computed all possible values of dynamical density with increasing and decreasing sequences of plasma frequency (ω p) and wave number (k) over a wide range of different combinations of the plasma parameters (κ, Γ). Our new simulation results show that the fluctuation of S(k,ω) increases with increasing Г and it decreases with an increase of κ and N. Moreover, investigation shows that the amplitude of S(k,ω) increases by increasing screening (κ) and wave number (k), and it decreases with increasing Г. Our EMD simulation shows that dynamical density of SCCDPs is slightly dependent on N; however, it is nearly independent of other parameters. The presented results obtained through EMD approach are in reasonable agreement with earlier known results based on different numerical methods and plasma states. It is demonstrated that the presented model is the best tool for estimating the density fluctuation in the SCCDPs over a suitable range of parameters.

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Diffusion coefficients of electrorheological complex (dusty) plasmas

Shakoori

Shahzad

et al. 2022

J Mol Model

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Equilibrium molecular dynamics (EMD) simulations have been executed to investigate the parallel (D ) and perpendicular (D ┴ ) diffusion coe cients for three-dimensional (3D) strongly coupled (SC) electrorheological complex (dusty) plasmas (ERCPs). The effects of uniaxial (z-axis) ac electric eld (M T ) on dust grains have been investigated along with various combinations of plasma parameters (Γ, κ). The new outcomes obtained by mean squared displacement of Einstein relation show diffusion coe cients for low-intermediate to high plasma couplings (Γ) for varying M T . The D and D ┴ at M T = 0.01 are agree well with earlier available data obtained from the Green-Kubo and Einstein relation for 3D SC-Yukawa systems. The simulation data show that D increase with an increase of moderate M T strength and D ┴ decreased for the intermediate to large M T strength Both (D , D ┴ ) remained nearly constant for low M T values. The investigations show that the current EMD scheme is more e cient for nonideal gas-like, liquids-like and solid-like states of SC-ERCPs. It has been demonstrated that present simulation outcomes extended the M T range up to 0.01 ≤ M T ≤ 10 to understand the diffusive and rheological behavior of dusty plasmas systems.

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Equilibrium molecular dynamics simulation of shear viscosity of two-dimensional complex (dusty) plasmas

Cited by 15 publications

References 17 publications

Thermal Conductivity of Dusty Plasmas through Molecular Dynamics Simulations

Thermal Conductivity of Dusty Plasmas through Molecular Dynamics Simulations

Numerical Approach to Dynamical Structure Factor of Dusty Plasmas

Diffusion coefficients of electrorheological complex (dusty) plasmas

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