Progress of the unified wave-particle methods for non-equilibrium flows from continuum to rarefied regimes

S Liu, K Xu, C Zhong - Acta Mechanica Sinica, 2022 - Springer
The predictions of the multiple-regime flows from continuum regime to free molecular regime
are crucial for the aerodynamic design in a large number of engineering applications, such …

A multiscale discrete velocity method for diatomic molecular gas

Q Zhang, C Zhuo, J Mu, C Zhong, S Liu - Physics of Fluids, 2023 - pubs.aip.org
In the previous study, the multiscale discrete velocity method (MDVM) has been developed
for monatomic gas with particle translational motion only. Unlike the unified gas-kinetic …

Adaptive unified gas-kinetic scheme for diatomic gases with rotational and vibrational nonequilibrium

Y Wei, W Long, K Xu - Computer Physics Communications, 2024 - Elsevier
Multiscale nonequilibrium physics at large variations of local Knudsen number are
encountered in applications of aerospace engineering and micro-electro-mechanical …

[图书][B] A unified computational fluid dynamics framework from rarefied to continuum regimes

K Xu - 2021 - cambridge.org
This Element presents a unified computational fluid dynamics framework from rarefied to
continuum regimes. The framework is based on the direct modelling of flow physics in a …

An ES-BGK model for diatomic gases with correct relaxation rates for internal energies

J Mathiaud, L Mieussens, M Pfeiffer - European Journal of Mechanics-B …, 2022 - Elsevier
We propose a new ES-BGK model for diatomic gases which allows for translational–
rotational and translational–vibrational energy exchanges, as given by Landau–Teller and …

A unified gas-kinetic scheme for continuum and rarefied flows VI: Dilute disperse gas-particle multiphase system

C Liu, Z Wang, K Xu - Journal of Computational Physics, 2019 - Elsevier
In this paper, a unified gas-kinetic scheme (UGKS) for multiphase dilute gas-particle system
is proposed. The UGKS multiphase (UGKS-M) is a finite volume method, which captures …

A conservative implicit scheme for steady state solutions of diatomic gas flow in all flow regimes

R Yuan, C Zhong - Computer Physics Communications, 2020 - Elsevier
An implicit scheme for steady state solutions of diatomic gas flow is presented. The Rykov
model equation is solved in the finite volume discrete velocity method framework, in which …

GKS and UGKS for high-speed flows

Y Zhu, C Zhong, K Xu - Aerospace, 2021 - mdpi.com
The gas-kinetic scheme (GKS) and the unified gas-kinetic scheme (UGKS) are numerical
methods based on the gas-kinetic theory, which have been widely used in the numerical …

Unified gas-kinetic scheme with simplified multi-scale numerical flux for thermodynamic non-equilibrium flow in all flow regimes

R Zhang, S Liu, C Zhong, C Zhuo - Communications in Nonlinear Science …, 2023 - Elsevier
In this paper, a BGK-type kinetic model for diatomic gases is proposed to describe the high-
temperature thermodynamic non-equilibrium effect, which is a phenomenological relaxation …

Improved fully implicit discrete-velocity method for efficient simulation of flows in all flow regimes

LM Yang, Z Chen, C Shu, WM Yang, J Wu, LQ Zhang - Physical Review E, 2018 - APS
In this work, an improved fully implicit discrete-velocity method (DVM) is developed for flows
over all Knudsen numbers. The improvements aim to overcome the drawbacks of the …