arXiv Open Access 2024

Moment-preserving Monte-Carlo Coulomb collision method for particle codes

Justin Ray Angus Yichen Fu Vasily Geyko Dave Grote David Larson

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Abstrak

Binary-pairing Monte-Carlo methods are widely used in particle-in-cell codes to capture effects of small angle Coulomb collisions. These methods preserve momentum and energy exactly when the simulation particles have equal weights. However, when the interacting particles are of varying weight, these physical conservation laws are only preserved on average. Here, we 1) extend these methods to weighted particles such that the scattering physics is correct on average, and 2) describe a new method for adjusting the particle velocities post scatter to restore exact conservation of momentum and energy. The efficacy of the model is illustrated with various test problems.

Topik & Kata Kunci

physics.comp-ph physics.plasm-ph

Penulis (5)

Justin Ray Angus

Yichen Fu

Vasily Geyko

Dave Grote

David Larson

Format Sitasi

APA MLA BibTeX

Angus, J.R., Fu, Y., Geyko, V., Grote, D., Larson, D. (2024). Moment-preserving Monte-Carlo Coulomb collision method for particle codes. https://arxiv.org/abs/2407.19151

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Informasi Jurnal

Tahun Terbit: 2024
Bahasa: en
Sumber Database: arXiv
Akses: Open Access ✓