arXiv:2411.17433physics.flu-dyncs.AI2024-11

用稀疏数据低成本预测流体动力学,融合降维与浅层网络。

LC-SVD-DLinear: A low-cost physics-based hybrid machine learning model for data forecasting using sparse measurements

  • 用低代价SVD分解时序系数,结合浅层线性网络捕捉非线性动态。
  • 在雷诺数220和2600下,稀疏数据预测误差低于5%且重构效果稳定。
  • 适合流体模拟、工程仿真等需高效建模的场景,尤其关注计算成本。

本文提出一种新方法LC-SVD-DLinear,将低代价奇异值分解(LC-SVD)与DLinear架构结合,用于高分辨率流体力学数据的预测。该方法将输入特征——时间系数——分解为趋势与季节成分,由浅层神经网络学习其非线性动态。模型可直接处理欠采样数据,或通过两种技术从高分辨率数据中下采样,有效降低整体计算成本。此外,还提出了针对高阶数据的变体LC-HOSVD-DLinear,结合低代价高阶奇异值分解(LC-HOSVD)。在两个数据集上验证:三维圆柱绕流(Re=220)的数值模拟,以及雷诺数2600的实验湍流数据。结果通过多种误差指标评估,包含不确定性量化。本工作将集成至ModelFLOWs-app下一版本。

原文摘要 · Abstract (English)

This article introduces a novel methodology that integrates singular value decomposition (SVD) with a shallow linear neural network for forecasting high resolution fluid mechanics data. The method, termed LC-SVD-DLinear, combines a low-cost variant of singular value decomposition (LC-SVD) with the DLinear architecture, which decomposes the input features-specifically, the temporal coefficients-into trend and seasonality components, enabling a shallow neural network to capture the non-linear dynamics of the temporal data. This methodology uses under-resolved data, which can either be input directly into the hybrid model or downsampled from high resolution using two distinct techniques provided by the methodology. Working with under-resolved cases helps reduce the overall computational cost. Additionally, we present a variant of the method, LC-HOSVD-DLinear, which combines a low-cost version of the high-order singular value decomposition (LC-HOSVD) algorithm with the DLinear network, designed for high-order data. These approaches have been validated using two datasets: first, a numerical simulation of three-dimensional flow past a circular cylinder at $Re = 220$; and second, an experimental dataset of turbulent flow passing a circular cylinder at $Re = 2600$. The combination of these datasets demonstrates the robustness of the method. The forecasting and reconstruction results are evaluated through various error metrics, including uncertainty quantification. The work developed in this article will be included in the next release of ModelFLOWs-app

流体预测降维浅层网络

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