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首页> 外文期刊>Journal of Computational Physics >Numerical approximation of the Euler-Maxwell model in the quasineutral limit
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Numerical approximation of the Euler-Maxwell model in the quasineutral limit

机译:拟中性极限中Euler-Maxwell模型的数值逼近

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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→ 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 Δ x/ λ→ 0 where Δ. x is the spatial discretization. But, when λ/Δ x→ 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.
机译:我们推导并分析了拟中性极限中Euler-Maxwell系统的渐近保存方案。我们证明了当λ→0时,时间步长上的线性稳定性条件与缩放的德拜长度λ无关。当Δx /λ→0时的-Maxwell解。 x是空间离散化。但是,当λ/Δx→0时,AP方案与准中性Euler-Maxwell系统一致。该方案也与高斯方程完全一致。使用较大的时间和空间步长的可能性导致计算机时间和存储量减少几个数量级。

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