反应性微量物种建模：基于仿真工具PICLas
Reactive Trace Species Modeling with the Simulation Tool PICLas
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中文总结 AI 辅助
本研究在PICLas中为DSMC的碰撞模型开发了物种特定加权方案，以低噪声模拟大气进入中微量物种的化学反应与电离，经储层及圆柱验证后，成功应用于RAM-C II再入探测器的激波层电离模拟，与实验数据高度一致。
中文摘要 AI 辅助
针对直接模拟蒙特卡洛方法中的自然样本大小碰撞模型，开发了一种物种特定的加权方案，并将其实现于开源气体与等离子体求解器PICLas中。该加权方案特别强调微量物种的化学反应和电离过程，以确保大气进入过程模拟的物理准确性和低噪声。通过一个反应性空气混合物的储层模拟，验证了该方案的成功实现以及弛豫过程和化学反应中动量与能量的守恒。作为更复杂的验证案例，研究了高度为108公里处圆柱体的大气进入模拟。最后，利用所开发的加权方案研究了RAM-C II再入探测器在大气进入期间激波层中的电离过程。模拟结果与实验飞行数据吻合良好，并减少了稀薄区域中带电物种的噪声。
英文摘要
A species-specific weighting scheme for the Natural-Sample-Size collision model within the Direct Simulation Monte Carlo method is developed and implemented in the open-source gas and plasma solver PICLas. The implemented weighting scheme places particular emphasis on chemical reactions and ionization processes of trace species in order to guarantee physically accurate and low-noise simulations of atmospheric entry processes. The successful implementation and the conservation of momentum and energy during relaxation processes and chemical reactions are verified through a reservoir simulation of a reacting air mixture. As a more sophisticated validation case, atmospheric entry simulations of a cylinder at an altitude of 108 km are investigated. In a final step, the developed weighting scheme is employed to investigate ionization processes in the shock layer surrounding the RAM-C II reentry probe during atmospheric entry. The simulations showed very good agreement with experimental flight data and reduced noise in the rarefied regions for the charged species.
发表机构
- Institute of Space Systems, University of Stuttgart（斯图加特大学空间系统研究所）
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