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arXiv · 2305.14234

A Galerkin type method for kinetic Fokker Planck equations based on Hermite expansions

Benny Avelin·Mingyi Hou·Kaj Nyström
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Abstract

In this paper, we develop a Galerkin-type approximation, with quantitative error estimates, for weak solutions to the Cauchy problem for kinetic Fokker-Planck equations in the domain $(0, T) \times D \times \mathbb{R}^d$, where $D$ is either $\mathbb{T}^d$ or $\mathbb{R}^d$. Our approach is based on a Hermite expansion in the velocity variable only, with a hyperbolic system that appears as the truncation of the Brinkman hierarchy, as well as ideas from $\href{arXiv:1902.04037v2}{AAMN21}$ and additional energy-type estimates that we have developed. We also establish the regularity of the solution based on the regularity of the initial data and the source term.

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Benny Avelin, Mingyi Hou, Kaj Nyström. 2023-05-23. A Galerkin type method for kinetic Fokker Planck equations based on Hermite expansions. https://doi.org/10.3934/krm.2023035

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