Discretization of the velocity space in the solution of the boltzmann equation. Shan, X. & He, X. *Phys. Rev. Lett.*, 80(1):65–68, American Physical Society, jan, 1998. Paper doi abstract bibtex We point out an equivalence between the discrete velocity method of solving the Boltzmann equation, of which the lattice Boltzmann equation method is a special example, and the approximations to the Boltzmann equation by a Hermite polynomial expansion. Discretizing the Boltzmann equation with a BGK collision term at the velocities that correspond to the nodes of a Hermite quadrature is shown to be equivalent to truncating the Hermite expansion of the distribution function to the corresponding order. The truncated part of the distribution has no contribution to the moments of low orders and is negligible at small Mach numbers. Higher order approximations to the Boltzmann equation can be achieved by using more velocities in the quadrature.

@article{Shan1998,
abstract = {We point out an equivalence between the discrete velocity method of solving the Boltzmann equation, of which the lattice Boltzmann equation method is a special example, and the approximations to the Boltzmann equation by a Hermite polynomial expansion. Discretizing the Boltzmann equation with a BGK collision term at the velocities that correspond to the nodes of a Hermite quadrature is shown to be equivalent to truncating the Hermite expansion of the distribution function to the corresponding order. The truncated part of the distribution has no contribution to the moments of low orders and is negligible at small Mach numbers. Higher order approximations to the Boltzmann equation can be achieved by using more velocities in the quadrature.},
archivePrefix = {arXiv},
arxivId = {comp-gas/9712001},
author = {Shan, Xiaowen and He, Xiaoyi},
doi = {10.1103/PhysRevLett.80.65},
eprint = {9712001},
file = {:home/dwilde3m/.local/share/data/Mendeley Ltd./Mendeley Desktop/Downloaded/Shan, He - 1998 - Discretization of the velocity space in the solution of the boltzmann equation.pdf:pdf},
issn = {10797114},
journal = {Phys. Rev. Lett.},
mendeley-groups = {CompressibleLBM},
month = {jan},
number = {1},
pages = {65--68},
primaryClass = {comp-gas},
publisher = {American Physical Society},
title = {{Discretization of the velocity space in the solution of the boltzmann equation}},
url = {https://link.aps.org/doi/10.1103/PhysRevLett.80.65},
volume = {80},
year = {1998}
}

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