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arXiv 2202.05652math.NAcs.NAmath-phmath.MP
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碰撞频率依赖于速度的多种群BGK模型的数值格式

Numerical schemes for a multi-species BGK model with velocity-dependent collision frequency

Jeffrey Haack, Cory Hauck, Christian Klingenberg, Marlies Pirner, Sandra Warnecke

摘要:

我们考虑动力学描述的多物种气体混合物建模Bhatnagar-Gross-Krook(BGK)碰撞算子,其中碰撞频率不仅在时间和空间上变化,但也与微观速度。在这个模型中,麦克斯韦通常使用的标准BGK运营商被替换为这样的目标函数,这是由变分过程\cite{arXiv:2101.09047}定义的推广。在本文中,我们提出了一种数值方法来模拟这个模型,它使用隐式显式(IMEX)计划,以尽量减少一定的势函数,模仿拉格朗日功能,出现在理论推导。我们证明了数值方法保持了质量守恒、总动量守恒、总能量守恒以及分布函数的正性等理论性质,并通过数值算例说明了该方法的实用性和有效性.

英文摘要:

We consider a kinetic description of a multi-species gas mixture modeled with Bhatnagar-Gross-Krook (BGK) collision operators, in which the collision frequency varies not only in time and space but also with the microscopic velocity. In this model, the Maxwellians typically used in standard BGK operators are replaced by a generalization of such target functions, which are defined by a variational procedure \cite{arXiv:2101.09047}. In this paper we present a numerical method for simulating this model, which uses an Implicit-Explicit (IMEX) scheme to minimize a certain potential function, mimicking the Lagrange functional that appears in the theoretical derivation. We show that theoretical properties such as conservation of mass, total momentum and total energy as well as positivity of the distribution functions are preserved by the numerical method, and illustrate its usefulness and effectiveness with numerical examples.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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