基于高阶赫米特多项式的博尔兹曼模型为色度梯度格子的概括平衡:一个简化的实现与中心时刻
Shimpei Saito1, Naoki Takada1, Soumei Baba1
1Research Institute for Energy Conservation (iECO), National Institute of Advanced Industrial Science and Technology (AIST), 1-2-1 Namiki, Tsukuba 3058564, Japan.
Physical review. E
|January 20, 2024
概括
这项研究为二相流中的格子博尔兹曼模型引入了通用平衡,增强了利略的不变性和数值稳定性,特别是在高雷诺兹数下.
科学领域:
- 计算流体动力学 计算流体动力学
- 多相流量建模多相流量建模
- 数字方法 数字方法.
背景情况:
- 格子波兹曼方法 (LBM) 广泛用于模拟流体动力学.
- 双组件双相流在精确的数值模拟中提出了挑战.
- 现有的LBM平衡可能缺乏利略的不变性,影响准确性.
研究的目的:
- 为3D颜色梯度格子博尔茨曼模型开发通用平衡.
- 为了提高加利利的不变性和数值稳定性在两个组件的两相流动模拟.
- 为了研究更高阶赫米特多项式对平衡中心时刻的影响.
主要方法:
- 使用更高阶的赫米特多项式来导出一般化的平衡.
- 对速度独立性和简化的形式分析平衡中心时刻 (CMs).
- 实现和测试模型的动态问题与不同的密度比和雷诺兹数.
主要成果:
- 提出的一般化平衡表现出速度独立的CMs,以简化的形式.
- 与传统的LBM方法相比,证明了加利利的不变性得到了改善.
- 对于高达10的密度比率,可以实现高精度,限制在1000.
- 在较低密度比的非常高的雷诺兹数下观察到增强的数值稳定性.
结论:
- 一般化平衡为双组分双相流提供了更好的准确性和稳定性.
- 基于CM的多重放松时间模型从这些通用平衡中受益.
- 可能需要进一步的研究,以将精度扩展到更高密度比率.
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