Reexamining the supercritical bound of ion acoustic solitons.

IF 2.2 3区 物理与天体物理 Q2 PHYSICS, FLUIDS & PLASMAS
Ian M DesJardin, Christine M Hartzell, Jonathan Wrieden
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引用次数: 0

Abstract

Ion acoustic solitons can be generated by a charged object immersed in an electrostatic quasineutral two-temperature plasma flow. These are often described by the forced Korteweg-de Vries equation. Two-fluid simulations of this scenario are conducted and compared to numerical solutions of the forced Korteweg-de Vries equation and theoretical predictions. As in forced Korteweg-de Vries theory, flow regimes are observed where either precursor or pinned solitons are generated depending on the background bulk velocity and debris size. However, the critical velocities that govern phase transitions from wakes to precursor and precursor to pinned solitons are found to differ substantially with precursor solitons being much more likely to be produced than previously thought. A theory is derived for the supercritical transition speed. These disagreements, in theory, have ramifications on the use of ion acoustic solitons to detect space debris.

离子声孤子的超临界界的再检验。
离子声学孤子可以由带电物体浸入静电准中性双温等离子体流中产生。这些通常用强迫Korteweg-de Vries方程来描述。对该情景进行了双流体模拟,并与强迫Korteweg-de Vries方程的数值解和理论预测进行了比较。与强迫Korteweg-de Vries理论一样,根据背景体速度和碎片大小,可以观察到在产生前体孤子或钉住孤子的流动状态。然而,从尾迹到前驱体和前驱体到固定孤子的相变的临界速度被发现有很大的不同,前驱孤子比以前认为的更有可能产生。导出了超临界转变速度的理论。从理论上讲,这些分歧对使用离子声学孤子探测空间碎片产生了影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Physical Review E
Physical Review E PHYSICS, FLUIDS & PLASMASPHYSICS, MATHEMAT-PHYSICS, MATHEMATICAL
CiteScore
4.50
自引率
16.70%
发文量
2110
期刊介绍: Physical Review E (PRE), broad and interdisciplinary in scope, focuses on collective phenomena of many-body systems, with statistical physics and nonlinear dynamics as the central themes of the journal. Physical Review E publishes recent developments in biological and soft matter physics including granular materials, colloids, complex fluids, liquid crystals, and polymers. The journal covers fluid dynamics and plasma physics and includes sections on computational and interdisciplinary physics, for example, complex networks.
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