振动多原子气体的ES-BGK模型
An ES-BGK model for vibrational polyatomic gases
摘要：
我们提出了一个扩展的椭球统计BGK模型来解释在稀薄多原子气体的振动能量的离散水平。该模型满足H-定理，并包含参数，允许适合几乎任意值的普朗特数和弛豫时间的旋转和振动能量。与减少的分布技术，这个模型可以减少到一个三个分布系统，可以用来模拟多原子气体的旋转和振动能量的计算成本接近一个简单的单原子气体。
英文摘要：
We propose an extension of the Ellipsoidal-Statistical BGK model to account for discrete levels of vibrational energy in a rarefied polyatomic gas. This model satisfies an H-theorem and contains parameters that allow to fit almost arbitrary values for the Prandtl number and the relaxation times of rotational and vibrational energies. With the reduced distribution technique , this model can be reduced to a three distribution system that could be used to simulate polyatomic gases with rotational and vibrational energy for a computational cost close to that of a simple monoatomic gas.
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