An uncoupled implementation of the local mean energy plasma model

Villa, Andrea; Schurch, Roger; Barbieri, Luca; Malgesini, Roberto; Buccella, Giacomo

doi:10.1016/j.jcp.2021.110674

Cited by 5 publications

(4 citation statements)

References 61 publications

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“…The hierarchy tree is used to calculate the right-hand side of ( 17) approximately. The idea is similar to (17), which is constructing artificial source points and corresponding artificial intensities for other boxes in the hierarchy tree. Before obtaining I a ỹB;d k � � , we first calculate the artificial intensities of the parent box of B, and then those original source points located at the far interactions of the parent box could be approximated by the artificial intensities of the parent box of B.…”

Section: Fast Multipole Methods For the Evaluation Of Integralmentioning

confidence: 99%

“…As a product of streamer discharges, the non-thermal atmospheric plasma paves the way to a large number of chemical reactions in applications such as the pollution control [10], solubilisation of carbon nano-material [11,12] and disinfection [13,14]. Therefore, streamer discharges draw continuous research interests during the last several decades [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

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Adaptive strategies to fast multipole method in photoionisation calculations for streamer discharges

Lin

Zhuang

2022

High Voltage

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Recently, a new framework to compute the photoionisation rate in streamer discharges accurately and efficiently using the integral model and the fast multipole method (FMM) was presented. This paper further improves the efficiency of this framework with adaptive strategies. The adaptive strategies are based on the magnitude of radiation and the electric field during the streamer propagation, and are applied to the selection of the source and target points. The accuracy and efficiency of this adaptive FMM are studied quantitatively for different domain sizes, pressures and adaptive criteria, in comparison with some existing efficient approaches to compute the photoionisation. It is shown that appropriate adaptive strategies reduce the calculation time of the FMM greatly, and maintain the high accuracy that the numerical error is still much smaller than other methods based on partial differential equations. The performance of the proposed adaptive method is also studied for a three-dimensional positive streamer interacting problem with a plasma cloud, which shows that the FMM with proper adaptive strategies is even faster than the partial differential equation based methods with efficient boundary conditions for the ionisation calculation.

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Section: Fast Multipole Methods For the Evaluation Of Integralmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Adaptive strategies to fast multipole method in photoionisation calculations for streamer discharges

Lin

Zhuang

2022

High Voltage

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“…We performed a simulation using the PD-simulator presented in [48][49][50], which is based on a continuum model and a set of partial differential equations. Considering the treeing geometry generated in [51,52] with CAT scanning techniques, we assessed whether a sequence of PDs can cause major temperature deviations in the channels. A needle of 5 µm energized with an AC power supply of 10 kV r.m.s.…”

Section: Data Availability Statementmentioning

confidence: 99%

A computational modelling of carbon layer formation on treeing branches

Buccella¹,

Villa²,

Ceresoli³

et al. 2023

Modelling Simul. Mater. Sci. Eng.

Self Cite

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Polymeric insulation employed in electrical power industry undergo irreversible and unpredictable ageing due to partial discharges. In particular, the dielectric properties of polyethylene used in high voltage cables are often compromised by the formation of electrical trees. In this work we assume that the propagation of treeing channels involves the injection of carbonic material into the gas interacting with the surface of the defect. Experimental characterizations proved that, in certain conditions, disordered graphitic carbon can form in some areas of the electrical trees, thus increasing surface conductivity and inhibiting partial discharges. The chemical mechanism involved in this process is yet to be clarified. Here we propose a model for this process. By means of a series of molecular dynamics simulations, we show how the chemisorption of gaseous molecules on a polyethylene surface can lead to a bidimensional carbonic structure. The characterization of the density of states of such systems suggests that the presence of pure carbon adsorbed on the polymer causes an increase in surface conductivity.

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“…Technological advancements have led to continuous improvements and validations of these models, enhancing both computational efficiency and applicability, as well as the precision with which they handle complex data, thereby deepening our understanding of discharge phenomena. Improved models based on DDM have revealed the principles behind discharge trees [39][40][41][42][43], and pulse discharges and have enhanced the accuracy of predictions regarding low-temperature plasma interactions with various materials [44][45][46][47][48][49]. By integrating fluid dynamics models with ion transport equations upon the Kaptzov hypothesis, the analytical ability of the model is improved and has achieved numerical simulation of the charged particle distribution produced by corona discharge from a needle electrode over large spatial scales [50].…”

Section: Introductionmentioning

confidence: 99%

Investigating the Influence of Free-Electron Pulses and Neutral Excited Species Formation on Discharge Development: By PD Quantum Optics Analysis and Plasma Simulation

Feng,

Cai,

Yuan

et al. 2024

IEEE Access

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Previous studies on discharge dynamics have primarily focused on the generation and migration of the charged particles and neglecting the influence of neutral excited-state particles. In this study, an integrated approach combining experiment and simulation was used to investigate the effect of neutral excited particles on discharge development. Firstly, partial discharge was induced by applying voltage to a pin-plate electrode in a darkroom environment and the emission spectrum of discharge was captured using an ultra-sensitive spectrometer. Then the formation mechanism of the main neutral excited particles in air corona discharge was analyzed based on the principle of quantum optics, and the collision cross-section data of the non-local thermodynamic equilibrium (NLTE) plasma chemical model for air was updated accordingly. Simulations revealed the process of electron pulses initiates the electron avalanche, which leads to dielectric breakdown. Results indicated that overvoltage can lead to the formation of electron avalanches at defect sites, which is capable of causing dielectric breakdown within the nanosecond time scale. The competitive mechanism of the excitation reactions to ionization reactions results in the dissipation of free electrons' energy, effectively suppressing the development of electron avalanches and preventing electrical breakdown.

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An uncoupled implementation of the local mean energy plasma model

Cited by 5 publications

References 61 publications

Adaptive strategies to fast multipole method in photoionisation calculations for streamer discharges

Adaptive strategies to fast multipole method in photoionisation calculations for streamer discharges

A computational modelling of carbon layer formation on treeing branches

Investigating the Influence of Free-Electron Pulses and Neutral Excited Species Formation on Discharge Development: By PD Quantum Optics Analysis and Plasma Simulation

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