颗粒式水破裂的数值模拟:离散元素,纳维埃-斯托克斯和薄层模型之间的比较
Hugo A Martin1,2, Marc Peruzzetto1,3, Sylvain Viroulet1,4
1Université Paris Cité, Institut de physique du globe de Paris, CNRS, F-75005 Paris, France.
Physical review. E
|December 20, 2023
概括
通过比较颗粒式流量模型,可以发现动态的显著差异,尽管在表面演变和底部应力方面存在一些一致性. 这凸显了评估模型局限性的必要性,以准确地质物理和工业流动模拟.
科学领域:
- 地质物理学 地质物理学
- 流体动力学 流体动力学
- 计算科学 计算科学
背景情况:
- 颗粒流在自然和工业环境中普遍存在.
- 基于物理的模型 (离散,纳维埃-斯托克斯,薄层) 存在,但它们的比较连贯性尚未研究.
- 了解模型差异对于准确的颗粒式流量模拟至关重要.
研究的目的:
- 为了比较离散 (COCD),Navier-Stokes (Basilisk) 和薄层 (SHALTOP) 模拟颗粒式水断层的模拟.
- 评估相互连贯性,并确定不同建模方法之间的差异.
- 评估模型尺度对模拟颗粒流动力学的影响.
主要方法:
- 在水平和倾斜的平面上模拟颗粒大破裂场景.
- 采用了三种不同的建模方法:凸起式优化联系动力学 (COCD),巴西利斯克和SHALTOP.
- 分析了自由表面演变,流动动力学和底部应力.
主要成果:
- 所有模型都在水平情况下重现了自由的表面演变 (最初除了SHALTOP).
- 观察到模拟流动动态的显著差异,特别是在停止阶段.
- 底部应力测量显示出很好的一致性,尽管COCD由于复杂的颗粒状格子而表现出差异.
结论:
- 不同尺度的颗粒式流量模型产生显著不同的动态结果.
- 尽管有一些协议,但必须考虑模型特定的行为和限制.
- 这种比较分析对于理解颗粒式流量建模中的不确定性至关重要.
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