A fast Fourier spectral method for the homogeneous Boltzmann equation with non-cutoff collision kernels
A fast Fourier spectral method for the homogeneous Boltzmann equation with non-cutoff collision kernels
复制标题
非截止碰撞核齐次玻尔兹曼方程的快速傅立叶谱方法
DOI:
10.1016/j.jcp.2020.109806
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发表时间:
2020
影响因子:
4.1
通讯作者:
Qi, Kunlun
中科院分区:
文献类型:
--
作者:
Hu, Jingwei;Qi, Kunlun
We introduce a fast Fourier spectral method for the spatially homogeneous Boltzmann equation with non-cutoff collision kernels. Such kernels contain non-integrable singularity in the deviation angle which arise in a wide range of interaction potentials (e.g., the inverse power law potentials). Albeit more physical, the non-cutoff kernels bring a lot of difficulties in both analysis and numerics, hence are often cut off in most studies (the well-known Grad's angular cutoff assumption). We demonstrate that the general framework of the fast Fourier spectral method developed in [9], [14] can be extended to handle the non-cutoff kernels, achieving the accuracy/efficiency comparable to the cutoff case. We also show through several numerical examples that the solution to the non-cutoff Boltzmann equation enjoys the smoothing effect, a striking property absent in the cutoff case.
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影响因子:
4.1
作者:
Jingwei Hu;Zheng Ma
通讯作者:
Zheng Ma
影响因子:
3.1
作者:
Gamba, Irene M.;Haack, Jeffrey R.;Hu, Jingwei
通讯作者:
Hu, Jingwei
DOI:
--
发表时间:
1975
期刊:
影响因子:
--
作者:
A. Bobylev
通讯作者:
A. Bobylev
DOI:
--
发表时间:
--
期刊:
to appear in C.R.Acad. Sci. Paris, Ser. I
影响因子:
--
作者:
R.Alexandre;Y.Morimoto;S.Ukai;C.-J.Xu,and T.Yang
通讯作者:
C.-J.Xu,and T.Yang