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arXiv 2109.03327physics.flu-dyncs.CVcs.LG
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用物理引导的神经网络重建高分辨率湍流

Reconstructing High-resolution Turbulent Flows Using Physics-Guided Neural Networks

University of Pittsburgh(匹兹堡大学)

Shengyu Chen, Shervin Sammak, Peyman Givi, Joseph P. Yurko1, Xiaowei Jia

摘要:

湍流的直接数值模拟(DNS)计算量大,不能应用于大雷诺数的流动。大涡模拟(LES)是一种计算要求较低的替代方法,但无法准确捕获湍流传输的所有尺度。我们在这项工作中的目标是建立一个新的基于超分辨率技术的数据驱动的方法,从LES预测重建DNS数据。我们利用潜在的物理关系来规范不同物理变量之间的关系。我们还引入了一个分层的生成过程和反向退化过程,以充分探索DNS和LES数据之间的对应关系。我们通过单次快照实验和跨时间实验证明了我们的方法的有效性。结果证实,我们的方法可以更好地重建高分辨率DNS数据在空间和时间上的像素级重建误差和结构相似性。视觉比较表明,我们的方法在捕捉精细的流动动力学表现得更好。

英文摘要:

Direct numerical simulation (DNS) of turbulent flows is computationally expensive and cannot be applied to flows with large Reynolds numbers. Large eddy simulation (LES) is an alternative that is computationally less demanding, but is unable to capture all of the scales of turbulent transport accurately. Our goal in this work is to build a new data-driven methodology based on super-resolution techniques to reconstruct DNS data from LES predictions. We leverage the underlying physical relationships to regularize the relationships amongst different physical variables. We also introduce a hierarchical generative process and a reverse degradation process to fully explore the correspondence between DNS and LES data. We demonstrate the effectiveness of our method through a single-snapshot experiment and a cross-time experiment. The results confirm that our method can better reconstruct high-resolution DNS data over space and over time in terms of pixel-wise reconstruction error and structural similarity. Visual comparisons show that our method performs much better in capturing fine-level flow dynamics.

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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