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
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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
Qi, Kunlun
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Hu, Jingwei;Qi, Kunlun

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相似文献

我们引入了一种快速傅立叶谱方法,用于求解具有非截止碰撞核的空间齐次玻尔兹曼方程。此类核在偏差角中包含不可积奇点,该奇点出现在各种相互作用势(例如,逆幂律势)中。尽管更物理化,但非截止核在分析和数值上都带来了很多困难,因此在大多数研究中经常被截止(著名的 Grad 角截止假设)。我们证明了[9]、[14]中开发的快速傅立叶谱方法的通用框架可以扩展以处理非截止核,实现与截止情况相当的精度/效率。我们还通过几个数值例子表明,非截止玻尔兹曼方程的解具有平滑效应,这是截止情况下所没有的一个显着特性。
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.
非弹性玻尔兹曼碰撞算子的快速谱方法及其在加热颗粒气体中的应用
DOI: --
发表时间: 2019
影响因子: 4.1
作者:
Jingwei Hu;Zheng Ma
通讯作者: Zheng Ma
DOI: 10.1137/16m1096001
发表时间: 2017-01-01
影响因子: 3.1
作者:
Gamba, Irene M.;Haack, Jeffrey R.;Hu, Jingwei
通讯作者: Hu, Jingwei
玻尔兹曼方程的精确解
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