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Filtered Hyperbolic Moment Method for the Vlasov Equation

机译:Vlasov方程过滤的双曲力矩方法

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摘要

In this paper, we investigate the effect of the filter for the hyperbolicmoment equations(HME) [15] of the Vlasov-Poisson equations and propose a novelquasi time- consistent filter to suppress the numerical recurrence effect. Bytaking properties of HME into consideration, the filter preserves a lot ofphysical properties of HME, including Galilean invariance and the conservationof mass, momentum and energy. We present two viewpoints, collisional viewpointand dissipative viewpoint, to dissect the filter, and show that the filteredhyperbolic moment method can be treated as a solver of Vlasov equation.Numerical simulations of the linear Landau damping and two stream instabilityare tested to demonstrate the effectiveness of the filter in restrainingrecurrence arising from particle streaming. Both the analysis and the numericalresults indicate that the filtered HME can capture the evolution of the Vlasovequation, even when phase mixing and filamentation are dominant.
机译:在本文中,我们研究了VLASOV-Poisson方程的双曲线式方程(HME)[15]的滤波器对滤波器的影响,并提出了一种Novelquasi时间一致的过滤器来抑制数值复发效果。 HME的漂流性能考虑,过滤器保留了HME的大量物理性质,包括伽利利安不变性和质量,动量和能量的保护。我们展示了两个观点,碰撞Viewpointand耗散观点,解剖过滤器,并表明滤光恒温矩法可以被视为vlasov方程的求解器。线性Landau阻尼的数值模拟和测试的两条流动不含无可氧化性的验证以证明展示效果从粒子流引起的zerrimingrecurrence中过滤。分析和数值结果都表明过滤后的HME可以捕获VLASOVEQUATION的演变,即使相位混合和丝锥占主导地位。

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