arXiv:2504.11383cs.LG2025-04被引 20

用AI加速物理模拟,实现高效精准的多尺度动态仿真。

Time Marching Neural Operator FE Coupling: AI Accelerated Physics Modeling

  • 结合有限元与深度算子网络,通过区域分解和时间步进策略协同求解。
  • 计算成本降低,收敛速度提升20%,误差始终低于3%。
  • 自适应调整机器学习区域,无需重划分网格即可捕捉细节变化。

偏微分方程数值求解在多尺度、时变系统中常面临计算成本与精度难以平衡的问题。神经算子虽具加速潜力,但受限于大量训练数据、时间累积误差及多物理场泛化能力差。本文提出一种新型混合框架,将物理信息深度算子网络(DeepONet)与有限元法(FEM)通过域分解结合,并引入数值分析指导的时间推进机制。创新性地采用Schwarz方法高效耦合FEM与DeepONet子域,预训练的DeepONet处理复杂非线性区域,其余部分由传统FEM求解。通过在DeepONet中嵌入时间步进方案,显著抑制长期误差传播;并设计自适应子域演化策略,使机器学习区域可动态扩展,捕捉精细特征而无需重划分网格。实验表明,该框架收敛速度提升最高达20%,保持解精度误差低于3%。本工作实现了先进物理模型与机器学习求解器的统一融合,为高保真多尺度模拟提供可靠、可扩展的新范式。

原文摘要 · Abstract (English)

Numerical solvers for PDEs often struggle to balance computational cost with accuracy, especially in multiscale and time-dependent systems. Neural operators offer a promising way to accelerate simulations, but their practical deployment is hindered by several challenges: they typically require large volumes of training data generated from high-fidelity solvers, tend to accumulate errors over time in dynamical settings, and often exhibit poor generalization in multiphysics scenarios. This work introduces a novel hybrid framework that integrates physics-informed deep operator network with FEM through domain decomposition and leverages numerical analysis for time marching. Our innovation lies in efficient coupling FE and DeepONet subdomains via a Schwarz method, expecting to solve complex and nonlinear regions by a pretrained DeepONet, while the remainder is handled by conventional FE. To address the challenges of dynamic systems, we embed a time stepping scheme directly into the DeepONet, substantially reducing long-term error propagation. Furthermore, an adaptive subdomain evolution strategy enables the ML-resolved region to expand dynamically, capturing fine-scale features without remeshing. Our framework shows accelerated convergence rates (up to 20% improvement in convergence rates compared to conventional FE coupling approaches) while preserving solution fidelity with error margins consistently below 3%. Our study shows that our proposed hybrid solver: (1) reduces computational costs by eliminating fine mesh requirements, (2) mitigates error accumulation in time-dependent simulations, and (3) enables automatic adaptation to evolving physical phenomena. This work establishes a new paradigm for coupling state of the art physics based and machine learning solvers in a unified framework, offering a robust, reliable, and scalable pathway for high fidelity multiscale simulations.

神经算子有限元多尺度模拟AI加速

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