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arXiv 2102.12882physics.plasm-ph
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双流体等离子体模型的伪谱时域分析法求解

A solver based on pseudo-spectral analytical time-domain method for the two-fluid plasma model

B. Morel, R. Giust, K. Ardaneh, F Courvoisier

摘要:

激光与等离子体相互作用中的许多物理过程可以用双流体等离子体模型来描述。我们报告的三维二流体等离子体模型方程的求解器。该求解器特别适合于模拟短激光脉冲与等离子体之间的相互作用。流体求解器依赖于两步Lax-Wendroff分裂与四阶龙格库塔格式,我们使用伪谱分析时域(PSATD)方法来解决麦克斯韦的旋度方程。总体而言,该方法仅基于有限差分格式和快速傅立叶变换,不需要任何网格交错。伪谱分析时域方法消除了在没有电流的情况下横向电磁波传播的数值色散,这是其他Maxwell求解器常规观察到的。完整的算法是通过能量守恒和动量守恒时,电磁脉冲发射到等离子体斜坡和定量协议与波转换的p-偏振电磁波到等离子体斜坡。

英文摘要:

A number of physical processes in laser-plasma interaction can be described with the two-fluid plasma model. We report on a solver for the three-dimensional two-fluid plasma model equations. This solver is particularly suited for simulating the interaction between short laser pulses with plasmas. The fluid solver relies on two-step Lax-Wendroff split with a fourth-order Runge-Kutta scheme, and we use the PseudoSpectral Analytical Time-Domain (PSATD) method to solve Maxwell's curl equations. Overall, this method is only based on finite difference schemes and fast Fourier transforms and does not require any grid staggering. The PseudoSpectral Analytical Time-Domain method removes the numerical dispersion for transverse electromagnetic wave propagation in the absence of current that is conventionally observed for other Maxwell solvers. The full algorithm is validated by conservation of energy and momentum when an electromagnetic pulse is launched onto a plasma ramp and by quantitative agreement with wave conversion of p-polarized electromagnetic wave onto a plasma ramp.

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