arXiv:2410.14024physics.ao-phcs.AI2024-10被引 4

用生成模型从观测数据重建风机入流风场,精度达秒级。

Ensemble-based, large-eddy reconstruction of wind turbine inflow in a near-stationary atmospheric boundary layer through generative artificial intelligence

  • 基于大涡模拟与扩散模型融合观测数据生成风场概率集合。
  • 合成数据中顺流向速度相关系数0.20至0.85,真实案例中0.25至0.75。
  • 适用于风机动态仿真与大气边界层模拟,适合风电研究者。

为验证现场实验中风机的秒级动态行为,需精确重构进入风机的风场。现有时间分辨入流重构技术依赖较简单的谱模型,难以捕捉复杂大气湍流。本文提出一种基于大涡模拟的大气入流重构方法,通过扩散模型机器学习算法融合观测与大气模型信息,生成单个10分钟观测时段的概率性风场集合。重构风场可直接用于气动弹性代码或作为大涡模拟的边界条件。在三个合成野外试验中验证,真实与重构的顺流向速度相关系数在0.20至0.85之间;未观测场(横向速度、垂直速度、温度)也表现出正相关。在三个真实案例中,将重构风场驱动大涡模拟,结果与独立观测一致:视觉相似、符合预期功率谱特性,并能追踪秒级变化(相关系数0.25至0.75)。

原文摘要 · Abstract (English)

To validate the second-by-second dynamics of turbines in field experiments, it is necessary to accurately reconstruct the winds going into the turbine. Current time-resolved inflow reconstruction techniques estimate wind behavior in unobserved regions using relatively simple spectral-based models of the atmosphere. Here, we develop a technique for time-resolved inflow reconstruction that is rooted in a large-eddy simulation model of the atmosphere. Our "large-eddy reconstruction" technique blends observations and atmospheric model information through a diffusion model machine learning algorithm, allowing us to generate probabilistic ensembles of reconstructions for a single 10-min observational period. Our generated inflows can be used directly by aeroelastic codes or as inflow boundary conditions in a large-eddy simulation. We verify the second-by-second reconstruction capability of our technique in three synthetic field campaigns, finding positive Pearson correlation coefficient values (0.20>r>0.85) between ground-truth and reconstructed streamwise velocity, as well as smaller positive correlation coefficient values for unobserved fields (spanwise velocity, vertical velocity, and temperature). We validate our technique in three real-world case studies by driving large-eddy simulations with reconstructed inflows and comparing to independent inflow measurements. The reconstructions are visually similar to measurements, follow desired power spectra properties, and track second-by-second behavior (0.25 > r > 0.75).

风场重建生成模型大涡模拟风电

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