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research article

Comparative study between Cubic and Ellipsoidal Fokker-Planck kinetic models

Jun, Eunji
•
Pfeiffer, Marcel
•
Mieussens, Luc
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2019
AIAA Journal

Motivated by improving the performance of particle-based Monte-Carlo simulations in the transitional regime, Fokker–Planck kinetic models have been devised and studied as approximations of the Boltzmann collision operator. By generalizing the linear drift model, the cubic Fokker–Planck (cubic-FP) and ellipsoidal Fokker–Planck (ES-FP) have been proposed, in order to obtain the correct Prandtl number of 2/3 for a dilute monatomic gas. This study provides a close comparison between both models in low Mach and supersonic settings. While direct simulation Monte-Carlo (DSMC) here serves as the benchmark, overall close performance between cubic-FP, ES-FP, and DSMC is observed. Furthermore, while the ES-FP outperforms the cubic-FP model in the shock region of the supersonic flow around a cylinder, the latter shows a better accuracy in the near continuum regime. It is argued that the reason behind these discrepancies lies in the entropy law besides the transport properties.

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Type
research article
DOI
10.2514/1.J057935
Author(s)
Jun, Eunji
Pfeiffer, Marcel
Mieussens, Luc
Gorji, Mohammadhossein  
Date Issued

2019

Published in
AIAA Journal
Volume

57

Issue

6

Start page

2524

End page

2533

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
MCSS  
RelationURL/DOI

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https://arc.aiaa.org/doi/abs/10.2514/1.J057935
Available on Infoscience
April 1, 2019
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/155822
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