On the convergence of Lattice Boltzmann method for advection-diffusion equation with intermediate scaling
Abstract
The purpose of this article is to study the convergence of a lattice Boltzmann method (LBM) for a simple diffusion equation. The LBM is proven to be stable and consistent in some sense, so that convergence results may be obtained. The approach is similar to asymptotic analysis in the literature, although the schemes are also studied for intermediate time scalings. Usually, LBM are used in the range of acoustic regime, where δt ≃ δx, or in diffusive scaling, with δt ≃ δx 2 . In this work, we study any intermediate scaling δt ≃ δx 1+r with r ∈]0; 1]. The goal is to prove that this scaling is capable of approximating an advection-diffusion equation, provided the relaxation rate is chosen in accordance with δx. Convergence results are established and match the previously known results in the diffusive regime. The second objective is to prove that several choices for the initial condition are suitable for convergence. In particular, the usual choice of equilibrium distribution at initial time guarantees that the LBM scheme yields an accurate approximation of the macroscopic quantities.
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BibTeX
@misc{luddens2026convergence,
title = {{On the convergence of Lattice Boltzmann method for advection-diffusion equation with intermediate scaling}},
author = {Francky Luddens},
howpublished = {HAL},
year = {2026},
month = nov,
url = {https://hal.science/hal-05853222v1},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - On the convergence of Lattice Boltzmann method for advection-diffusion equation with intermediate scaling
AU - Francky Luddens
PY - 2026
DA - 2026/11/05
PB - HAL
UR - https://hal.science/hal-05853222v1
AB - The purpose of this article is to study the convergence of a lattice Boltzmann method (LBM) for a simple diffusion equation. The LBM is proven to be stable and consistent in some sense, so that convergence results may be obtained. The approach is similar to asymptotic analysis in the literature, although the schemes are also studied for intermediate time scalings. Usually, LBM are used in the range of acoustic regime, where δt ≃ δx, or in diffusive scaling, with δt ≃ δx 2 . In this work, we study any intermediate scaling δt ≃ δx 1+r with r ∈]0; 1]. The goal is to prove that this scaling is capable of approximating an advection-diffusion equation, provided the relaxation rate is chosen in accordance with δx. Convergence results are established and match the previously known results in the diffusive regime. The second objective is to prove that several choices for the initial condition are suitable for convergence. In particular, the usual choice of equilibrium distribution at initial time guarantees that the LBM scheme yields an accurate approximation of the macroscopic quantities.
ER -