### Abstract

previously shown to capture rarefaction effects in the standing-shearwave problems. Here, we further examine the capability of high-order LB models in modeling nonequilibrium flows considering gas and surface interactions and their effect on the bulk flow. The Maxwellian gas and surface interaction model, which has been commonly used in other kinetic methods including the direct simulation Monte Carlo method, is used in the LB simulations. In general, the LB models with high-order Gauss-Hermite quadratures can capture flow characteristics in the Knudsen layer and higher order quadratures give more accurate prediction. However, for the Gauss-Hermite quadratures, the present simulation results show that the LB models with the quadratures obtained from the even-order Hermite polynomials perform significantly better than those from the odd-order polynomials. This may be attributed to the zero-velocity component in the odd-order discrete set, which does not participate in wall

and gas collisions, and thus underestimates the wall effect.

Language | English |
---|---|

Pages | Article 036704 |

Number of pages | 10 |

Journal | Physical Review E: Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics |

Volume | 83 |

Issue number | 3 |

DOIs | |

Publication status | Published - 11 Mar 2011 |

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### Keywords

- high-order lattice Boltzmann models
- nonequilibrium gas flows
- Gauss-Hermite quadratures
- even-order Hermite polynomials

### Cite this

}

*Physical Review E: Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics*, vol. 83, no. 3, pp. Article 036704. https://doi.org/10.1103/PhysRevE.83.036704

**Gauss-Hermite quadratures and accuracy of lattice Boltzmann models for non-equilibrium gas flows.** / Meng, Jian-Ping; Zhang, Yonghao.

Research output: Contribution to journal › Article

TY - JOUR

T1 - Gauss-Hermite quadratures and accuracy of lattice Boltzmann models for non-equilibrium gas flows

AU - Meng, Jian-Ping

AU - Zhang, Yonghao

N1 - Impact Factor 2.400, Half-Life 6.7

PY - 2011/3/11

Y1 - 2011/3/11

N2 - Recently, kinetic theory-based lattice Boltzmann (LB) models have been developed to model nonequilibrium gas flows. Depending on the order of quadratures, a hierarchy of LB models can be constructed which we havepreviously shown to capture rarefaction effects in the standing-shearwave problems. Here, we further examine the capability of high-order LB models in modeling nonequilibrium flows considering gas and surface interactions and their effect on the bulk flow. The Maxwellian gas and surface interaction model, which has been commonly used in other kinetic methods including the direct simulation Monte Carlo method, is used in the LB simulations. In general, the LB models with high-order Gauss-Hermite quadratures can capture flow characteristics in the Knudsen layer and higher order quadratures give more accurate prediction. However, for the Gauss-Hermite quadratures, the present simulation results show that the LB models with the quadratures obtained from the even-order Hermite polynomials perform significantly better than those from the odd-order polynomials. This may be attributed to the zero-velocity component in the odd-order discrete set, which does not participate in walland gas collisions, and thus underestimates the wall effect.

AB - Recently, kinetic theory-based lattice Boltzmann (LB) models have been developed to model nonequilibrium gas flows. Depending on the order of quadratures, a hierarchy of LB models can be constructed which we havepreviously shown to capture rarefaction effects in the standing-shearwave problems. Here, we further examine the capability of high-order LB models in modeling nonequilibrium flows considering gas and surface interactions and their effect on the bulk flow. The Maxwellian gas and surface interaction model, which has been commonly used in other kinetic methods including the direct simulation Monte Carlo method, is used in the LB simulations. In general, the LB models with high-order Gauss-Hermite quadratures can capture flow characteristics in the Knudsen layer and higher order quadratures give more accurate prediction. However, for the Gauss-Hermite quadratures, the present simulation results show that the LB models with the quadratures obtained from the even-order Hermite polynomials perform significantly better than those from the odd-order polynomials. This may be attributed to the zero-velocity component in the odd-order discrete set, which does not participate in walland gas collisions, and thus underestimates the wall effect.

KW - high-order lattice Boltzmann models

KW - nonequilibrium gas flows

KW - Gauss-Hermite quadratures

KW - even-order Hermite polynomials

UR - http://www.scopus.com/inward/record.url?scp=79953158199&partnerID=8YFLogxK

U2 - 10.1103/PhysRevE.83.036704

DO - 10.1103/PhysRevE.83.036704

M3 - Article

VL - 83

SP - Article 036704

JO - Physical Review E

T2 - Physical Review E

JF - Physical Review E

SN - 1539-3755

IS - 3

ER -