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arXiv 1104.1870math-phmath.MP
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拟中性极限下Euler-Maxwell模型的数值逼近

Numerical approximation of the Euler-Maxwell model in the quasineutral limit

Pierre Degond, Fabrice Deluzet, Dominique Savelief

摘要:

在准中性极限下,我们导出并分析了Euler-Maxwell系统的一个保渐近格式。我们证明了当$λ\to 0$时,时间步长上的线性稳定性条件与标度德拜长度$λ$无关。对Riemann初始数据和一个等离子体断路开关模型的数值验证表明,当空间离散为$Δx/ λ\to 0$(其中$Δx$)时,AP格式收敛于Euler-Maxwell解.但当方程为$λ/Δx \to 0$时,AP格式与拟中立型Euler-Maxwell系统是一致的.该方案也完全符合高斯方程。使用大的时间和空间步长的可能性导致计算机时间和存储量的几个数量级的减少。

英文摘要:

We derive and analyze an Asymptotic-Preserving scheme for the Euler-Maxwell system in the quasi-neutral limit. We prove that the linear stability condition on the time-step is independent of the scaled Debye length $λ$ when $λ\to 0$. Numerical validation performed on Riemann initial data and for a model Plasma Opening Switch device show that the AP-scheme is convergent to the Euler-Maxwell solution when $Δx/ λ\to 0$ where $Δx$ is the spatial discretization. But, when $λ/Δx \to 0$, the AP-scheme is consistent with the quasi-neutral Euler-Maxwell system. The scheme is also perfectly consistent with the Gauss equation. The possibility of using large time and space steps leads to several orders of magnitude reductions in computer time and storage.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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