论文标题
汉堡湍流的可区分物理闭合建模
Differentiable physics-enabled closure modeling for Burgers' turbulence
论文作者
论文摘要
数据科学中的算法和硬件开发后,数据驱动的湍流建模正在引起人们的兴趣。我们讨论了一种使用可区分物理范式的方法,该方法将已知物理学与机器学习结合起来,以开发汉堡湍流的闭合模型。我们将1D汉堡系统视为一种原型测试问题,用于建模以对流为主的湍流问题中未解决的术语。我们训练一系列模型,这些模型在后验损耗函数上结合了不同程度的物理假设,以测试模型在一系列系统参数(包括粘度,时间和网格分辨率)上的功效。我们发现,具有偏微分方程形式的归纳偏差的约束模型包含已知物理或现有闭合方法会产生高度数据效率,准确且可推广的模型,并且表现优于最先进的基准。以物理信息形式添加结构还为模型带来了一定程度的解释性,有可能为封闭建模的未来提供垫脚石。
Data-driven turbulence modeling is experiencing a surge in interest following algorithmic and hardware developments in the data sciences. We discuss an approach using the differentiable physics paradigm that combines known physics with machine learning to develop closure models for Burgers' turbulence. We consider the 1D Burgers system as a prototypical test problem for modeling the unresolved terms in advection-dominated turbulence problems. We train a series of models that incorporate varying degrees of physical assumptions on an a posteriori loss function to test the efficacy of models across a range of system parameters, including viscosity, time, and grid resolution. We find that constraining models with inductive biases in the form of partial differential equations that contain known physics or existing closure approaches produces highly data-efficient, accurate, and generalizable models, outperforming state-of-the-art baselines. Addition of structure in the form of physics information also brings a level of interpretability to the models, potentially offering a stepping stone to the future of closure modeling.