新模型通过分解物理机制,实现长期湍流稳定预测。
Differential-Integral Neural Operator for Long-Term Turbulence Forecasting
- 分离局部微分与全局积分过程,用卷积和Transformer分别建模
- 在2D科莫戈罗夫流动上预测数百步仍保持误差低、能量谱准确
- 适合需要高物理一致性的气候与航天模拟场景
准确预测湍流的长期演化是科学计算中的重大挑战,对气候建模和航空航天工程至关重要。现有深度学习方法,尤其是神经算子,在长期自回归预测中常因灾难性误差累积和物理保真度丧失而失效,根源在于无法同时捕捉湍流动力学的局部耗散效应与全局非局部相互作用。本文提出差分-积分神经算子(Differential-Integral Neural Operator, DINO),基于算子分解的原理设计。DINO通过并行分支显式建模:一个由约束卷积网络实现的局部微分算子(可证明收敛到导数),以及一个由Transformer架构捕获的数据驱动全局核的积分算子。这种物理启发的分解赋予DINO卓越的稳定性与鲁棒性。在具有挑战性的2D科莫戈罗夫流动基准测试中,DINO显著优于现有最优模型,成功抑制数百时间步的误差累积,保持涡量场与能量谱的高保真度,建立了物理一致性、长程湍流预报的新基准。
原文摘要 · Abstract (English)
Accurately forecasting the long-term evolution of turbulence represents a grand challenge in scientific computing and is crucial for applications ranging from climate modeling to aerospace engineering. Existing deep learning methods, particularly neural operators, often fail in long-term autoregressive predictions, suffering from catastrophic error accumulation and a loss of physical fidelity. This failure stems from their inability to simultaneously capture the distinct mathematical structures that govern turbulent dynamics: local, dissipative effects and global, non-local interactions. In this paper, we propose the {\textbf{\underline{D}}}ifferential-{\textbf{\underline{I}}}ntegral {\textbf{\underline{N}}}eural {\textbf{\underline{O}}}perator (\method{}), a novel framework designed from a first-principles approach of operator decomposition. \method{} explicitly models the turbulent evolution through parallel branches that learn distinct physical operators: a local differential operator, realized by a constrained convolutional network that provably converges to a derivative, and a global integral operator, captured by a Transformer architecture that learns a data-driven global kernel. This physics-based decomposition endows \method{} with exceptional stability and robustness. Through extensive experiments on the challenging 2D Kolmogorov flow benchmark, we demonstrate that \method{} significantly outperforms state-of-the-art models in long-term forecasting. It successfully suppresses error accumulation over hundreds of timesteps, maintains high fidelity in both the vorticity fields and energy spectra, and establishes a new benchmark for physically consistent, long-range turbulence forecast.
Thank you to arXiv for use of its open access interoperability. PaperDance 不是 arXiv 官方产品;中文卡片由大模型生成,请以原文为准。