Major research outcome
- Ph.D. Sanghun Kim and Professor Eunji Jun: A particle Fokker-Planck Master model for diatomic gas mixtures
- 관리자 |
- 2025-03-07 16:19:40|
- 26
- 2025-03-07 16:19:40|
During reentry, vehicles experience a strong bow shock in front of the body, followed by a rarefied flow region. To describe this multi-scale hypersonic flow that includes rarefied regions, the direct simulation Monte Carlo (DSMC) method based on the Boltzmann equation is widely employed. The DSMC method numerically solves the Boltzmann equation by employing stochastic particles and modeling their transport and binary collisions. However, binary collisions in the DSMC method result in high computational costs in near-continuum regimes. In order to address this issue, research has focused on using the particle-based Fokker–Planck model that approximates binary collisions as Brownian motion, Although advanced Fokker–Planck models have been proposed for monatomic and diatomic single gases, their extension to diatomic gas mixtures has not been sufficiently explored. Considering that 99% of Earth’s atmosphere is composed of nitrogen and oxygen, developing a diatomic mixture Fokker–Planck model including internal energy exchange between species is essential for accurately describing reentry flows.
Recently, Ph.D. Sanghun Kim and Professor Eunji Jun developed a new Fokker-Planck Master model for diatomic gas mixtures. This model incorporates mechanisms for energy exchange between translational, rotational, and vibrational modes based on the Jeans and Landau-Teller equations as well as momentum and energy transfer between species. In a numerical study of a hypersonic flow around a vertical flat plate, the results show that the Fokker–Planck Master (FPM) model agrees well with the DSMC method near equilibrium.
This research has been published in the 37th volume, issue 3 of the Physics of Fluids (POF) journal in 2025. Physics of Fluids is a leading journal in fluid mechanics, known for publishing high-quality research across the field of flow dynamics (IF: 4.1, top 5% in JCR).
Title: A stochastic particle method based on the Fokker–Planck Master equation for rarefied gas flows of diatomic mixtures
DOI: https://doi.org/10.1063/5.0258301
Recently, Ph.D. Sanghun Kim and Professor Eunji Jun developed a new Fokker-Planck Master model for diatomic gas mixtures. This model incorporates mechanisms for energy exchange between translational, rotational, and vibrational modes based on the Jeans and Landau-Teller equations as well as momentum and energy transfer between species. In a numerical study of a hypersonic flow around a vertical flat plate, the results show that the Fokker–Planck Master (FPM) model agrees well with the DSMC method near equilibrium.
This research has been published in the 37th volume, issue 3 of the Physics of Fluids (POF) journal in 2025. Physics of Fluids is a leading journal in fluid mechanics, known for publishing high-quality research across the field of flow dynamics (IF: 4.1, top 5% in JCR).
Title: A stochastic particle method based on the Fokker–Planck Master equation for rarefied gas flows of diatomic mixtures
DOI: https://doi.org/10.1063/5.0258301
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