arXiv:2511.15856cs.LGphysics.flu-dyn2025-11

GLOBE用物理启发架构实现高精度通用偏微分方程代理模型。

GLOBE: Accurate and Generalizable PDE Surrogates using Domain-Inspired Architectures and Equivariances

  • 基于格林函数核的多尺度结构,融合等变性与边界面到目标点的全局感知。
  • 在空气动力学数据集上误差降低100倍以上,远超现有模型。
  • 适合工业级工程仿真,支持非封闭网格和任意点求解。

我们提出GLOBE,一种针对均匀偏微分方程的新神经代理模型,其归纳偏置源自边界元方法与等变机器学习。GLOBE将解表示为从边界面到目标点的可学习格林函数类核的叠加,经多尺度分支与通信超层组合而成。该架构具备平移、旋转与镜像等变性;在细网格极限下对离散化不变;通过严格无量纲化实现单元不变性。显式远场衰减包络稳定外推,边界到边界超层通信建模长程耦合,全连接边界到目标评估实现全局感受野,尊重偏微分方程信息流,即使对椭圆型方程亦然。在AirFRANS(NACA机翼上的稳态不可压缩雷诺平均纳维-斯托克斯方程)数据集上,GLOBE显著提升精度:在“完整”划分中,所有场的均方误差较数据集基准降低约200倍,较次优模型降低约50倍;在“稀疏”划分中,速度与压力场误差低于Transolver的1/100,表面压力误差低至1/600。定性结果表明近壁梯度清晰、尾迹连贯,且在雷诺数与迎角适度外推下误差可控。模型仅含11.7万参数,推理时可在任意点评估场值。还可训练并预测非水密网格,具强实际意义。这些结果表明,严谨的物理与领域启发归纳偏置可大幅提高基于机器学习的偏微分方程代理模型在工业计算机辅助工程中的精度、泛化性与实用性。

原文摘要 · Abstract (English)

We introduce GLOBE, a new neural surrogate for homogeneous PDEs that draws inductive bias from boundary-element methods and equivariant ML. GLOBE represents solutions as superpositions of learnable Green's-function-like kernels evaluated from boundary faces to targets, composed across multiscale branches and communication hyperlayers. The architecture is translation-, rotation-, and parity-equivariant; discretization-invariant in the fine-mesh limit; and units-invariant via rigorous nondimensionalization. An explicit far-field decay envelope stabilizes extrapolation, boundary-to-boundary hyperlayer communication mediates long-range coupling, and the all-to-all boundary-to-target evaluation yields a global receptive field that respects PDE information flow, even for elliptic PDEs. On AirFRANS (steady incompressible RANS over NACA airfoils), GLOBE achieves substantial accuracy improvements. On the "Full" split, it reduces mean-squared error by roughly 200x on all fields relative to the dataset's reference baselines, and roughly 50x relative to the next-best-performing model. In the "Scarce" split, it achieves over 100x lower error on velocity and pressure fields and over 600x lower error on surface pressure than Transolver. Qualitative results show sharp near-wall gradients, coherent wakes, and limited errors under modest extrapolation in Reynolds number and angle of attack. In addition to this accuracy, the model is quite compact (117k parameters), and fields can be evaluated at arbitrary points during inference. We also demonstrate the ability to train and predict with non-watertight meshes, which has strong practical implications. These results show that rigorous physics- and domain-inspired inductive biases can achieve large gains in accuracy, generalizability, and practicality for ML-based PDE surrogates for industrial computer-aided engineering (CAE).

PDE代理等变网络流体仿真神经算子

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