Quasi-periodic boundary conditions for hierarchical algorithms used for the calculation of inter-particle electrostatic interactions

Boutsikakis, Athanasios; Fede, Pascal; Simonin, Olivier

doi:10.1016/j.jcp.2022.111686

Cited by 2 publications

(4 citation statements)

References 20 publications

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“…If the particle concentration becomes higher, the particle number density needs to be included for a more accurate prediction (Boutsikakis et al. 2022, 2023). By assuming a sharp cutoff at , Lu & Shaw (2015) related the RDF of charged SS pairs to that of neutral SS pairs as where is the error function.…”

Section: Resultsmentioning

confidence: 99%

“…To properly apply the periodic boundary condition of the long-range electrostatic force, several layers of image domains are added around the original computation domain (Di Renzo & Urzay 2018; Boutsikakis, Fede & Simonin 2023). When calculating the electrostatic force acting on the th particle located at , the contributions from other particles at as well as their images at are all considered where .…”

Section: Methodsmentioning

confidence: 99%

“…Note that the critical velocity is derived from the interaction between a pair of particles, which could reasonably describe the major effect of the Coulomb force in the current dilution suspension. If the particle concentration becomes higher, the particle number density needs to be included for a more accurate prediction (Boutsikakis et al 2022(Boutsikakis et al , 2023. By assuming a sharp cutoff at…”

Section: Effect Of Coulomb Force On Particle Fluxmentioning

confidence: 99%

“…In addition to neutral particles, particles in nature could easily get charged after moving through ionized air (Marshall & Li 2014;van Minderhout et al 2021) or encountering collisions (Lee et al 2015). The resulting electrostatic interaction could significantly modulate the fundamental particle dynamics in turbulence, such as clustering, dispersion and agglomeration (Karnik & Shrimpton 2012;Yao & Capecelatro 2018;Ruan, Chen & Li 2021;Boutsikakis, Fede & Simonin 2022;Zhang, Cui & Zheng 2023). For identically charged particles, it has been shown that the Coulomb repulsion could effectively repel close particle pairs and mitigate particle clustering.…”

Section: Introductionmentioning

confidence: 99%

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Effects of electrostatic interaction on clustering and collision of bidispersed inertial particles in homogeneous and isotropic turbulence

Ruan,

Gorman,

2024

J. Fluid Mech.

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In sandstorms and thunderclouds, turbulence-induced collisions between solid particles and ice crystals lead to inevitable triboelectrification. The charge segregation is usually size dependent, with small particles charged negatively and large particles charged positively. In this work, we perform numerical simulations to study the influence of charge segregation on the dynamics of bidispersed inertial particles in turbulence. Direct numerical simulations of homogeneous isotropic turbulence are performed with the Taylor Reynolds number ${Re}_{\lambda }=147.5$ , while particles are subjected to both electrostatic interactions and fluid drag, with Stokes numbers of 1 and 10 for small and large particles, respectively. Coulomb repulsion/attraction is shown to effectively inhibit/enhance particle clustering within a short range. Besides, the mean relative velocity between same-size particles is found to rise as the particle charge increases because of the exclusion of low-velocity pairs, while the relative velocity between different-size particles is almost unaffected, emphasizing the dominant roles of differential inertia. The mean Coulomb-turbulence parameter, ${Ct}_0$ , is then defined to characterize the competition between the Coulomb potential energy and the mean relative kinetic energy. In addition, a model is proposed to quantify the rate at which charged particles approach each other and to capture the transition of the particle relative motion from the turbulence-dominated regime to the electrostatic-dominated regime. Finally, the probability distribution function of the approach rate between particle pairs is examined, and its dependence on the Coulomb force is further discussed using the extended Coulomb-turbulence parameter.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Effect Of Coulomb Force On Particle Fluxmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of electrostatic interaction on clustering and collision of bidispersed inertial particles in homogeneous and isotropic turbulence

Ruan,

Gorman,

2024

J. Fluid Mech.

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Turbulent dispersion and evaporation of charged nanofuel droplet clouds under the influence of electrostatic fields

Weiand,

Giusti

2024

International Journal of Spray and Combustion Dynamics

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The concept of smart combustion, where nanofuels and electromagnetic interactions are combined to enhance the flame characteristics and improve the control of the combustion process, is introduced as a new paradigm for next-generation hybrid propulsion systems. To gain further insight into the possibility of controlling the fuel location in a turbulent flow, the fundamental case of dispersion of a cloud of charged nanofuel droplets in initially homogeneous and isotropic turbulence under the action of electrostatic fields is investigated. Keeping electrical repulsion forces relatively small compared to the other forces, cases with and without evaporation are studied using direct numerical simulations for different strengths of the external electrostatic field. Results of the non-evaporating cases show that the use of external electrostatic fields enables the control of the location and velocity of the centre of mass of the cloud, with limited effect on the cloud dispersion, which is mainly determined by the background turbulence. Results for evaporating droplets in decaying turbulence show that external electrostatic forces enable a quick separation between cloud and vapour distribution in the case of fast-evaporating droplets. This separation could be further enhanced by designing nanomaterials with specific diffusion properties. This work is the first step towards developing smart combustion and provides new insight into the control of charged nanofuel droplet dynamics under the action of external electrostatic fields.

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Quasi-periodic boundary conditions for hierarchical algorithms used for the calculation of inter-particle electrostatic interactions

Cited by 2 publications

References 20 publications

Effects of electrostatic interaction on clustering and collision of bidispersed inertial particles in homogeneous and isotropic turbulence

Effects of electrostatic interaction on clustering and collision of bidispersed inertial particles in homogeneous and isotropic turbulence

Turbulent dispersion and evaporation of charged nanofuel droplet clouds under the influence of electrostatic fields

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