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BGK contamination model of the MSX satellite and comparison with Monte-Carlo simulation data

机译：MSX卫星的BGK污染模型以及与蒙特卡罗模拟数据的比较

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Abstract: The Bhatnagar-Gross-Krook (BGK) solution technique was used to predict molecular return flux from surface outgassing of the Mid-Course Space Experiment (MSX) spacecraft. The BGK predictions were compared to those from a Direct Simulation Monte-Carlo (DSMC) study. While the DSMC solution technique provides a rigorous numerical solution of the Boltzmann equation, it requires substantially more model development time and computer resources. Conversely, the BGK method yields an approximate solution to the Boltzmann equation but is simpler to use and numerical solutions can be rapidly obtained. A comparison of the two solutions, based on MSX spacecraft's near-free-molecular contamination environment, shows that the BGK predictions are within the statistical uncertainties of the DSMC results. This favorable comparison indicates that the BGK technique for modeling return flux to the MSX spacecraft is sufficiently accurate and cost effective.!12
机译：摘要：使用Bhatnagar-Gross-Krook（BGK）解决方案技术来预测中程空间实验（MSX）航天器表面除气的分子返回通量。将BGK预测与直接模拟蒙特卡洛（DSMC）研究中的预测进行了比较。 DSMC解决方案技术为Boltzmann方程提供了严格的数值解决方案，但它需要更多的模型开发时间和计算机资源。相反，BGK方法可得出Boltzmann方程的近似解，但使用起来更简单，可以快速获得数值解。根据MSX航天器的近乎自由分子污染的环境对这两种解决方案的比较表明，BGK的预测在DSMC结果的统计不确定性之内。这种有利的比较表明，用于模拟返回MSX航天器的返回通量的BGK技术足够准确且具有成本效益。12

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