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    陈俊宏, 程辉, 胡贵华. 一种基于冷扩散模型的复杂反应流场建模方法[J]. 华东理工大学学报(自然科学版). DOI: 10.14135/j.cnki.1006-3080.20231010001
    引用本文: 陈俊宏, 程辉, 胡贵华. 一种基于冷扩散模型的复杂反应流场建模方法[J]. 华东理工大学学报(自然科学版). DOI: 10.14135/j.cnki.1006-3080.20231010001
    CHEN Junhong, CHENG Hui, HU Guihua. A Modeling Method for Complex Turbulent Reactive Flow Field via Cold Diffusion Model[J]. Journal of East China University of Science and Technology. DOI: 10.14135/j.cnki.1006-3080.20231010001
    Citation: CHEN Junhong, CHENG Hui, HU Guihua. A Modeling Method for Complex Turbulent Reactive Flow Field via Cold Diffusion Model[J]. Journal of East China University of Science and Technology. DOI: 10.14135/j.cnki.1006-3080.20231010001

    一种基于冷扩散模型的复杂反应流场建模方法

    A Modeling Method for Complex Turbulent Reactive Flow Field via Cold Diffusion Model

    • 摘要: 仿真湍流复杂反应场的计算消耗巨大,为了缓解计算负担,许多研究基于深度学习方法构建数据驱动代理模型,但由于仿真计算消耗巨大,获取训练代理模型所需要的数据具有一定困难。为了解决上述问题,本文提出一种基于冷扩散模型(Cold Diffusion Model,CDM)的代理模型。与去噪扩散概率模型(Denoising Diffusion Probabilistic Model,DDPM)不同,插值冷扩散模型在扩散过程选择逐步插值替代加入随机高斯噪声,为复原过程引入更多信息。二维甲烷燃烧仿真实验证明,相比其他代理模型,插值冷扩散模型能够利用有限的数据,学习到更多的信息,减少训练所需计算数据数量,缓解计算负担。

       

      Abstract: Many data-driven surrogate models have been proposed to alleviate the computational burden of computational fluid dynamics (CFD) simulations. However, building data-driven surrogate models requires an adequate amount of training data. Due to the computational cost, obtaining sufficient training data to construct data-drive surrogate model which aims to solve the CFD computational burden is a dilemma. This paper proposes a data-driven surrogate modeling approach that only uses limited amount of CFD simulation data. The proposed method based on the Interpolation Cold Diffusion Model (ICDM) transforms the prediction of the species mass fraction distributions using boundary conditions into an image-to-image translation task, which translates the source domain species mass fraction distributions to the target domain species mass fraction distributions guided by the target domain boundary conditions. Unlike original denoising diffusion probabilistic model which adds random gaussian noise, ICDM interpolates between distributions in diffusion process which provides more information than the former for reducing the needed amount of the training data. The approach is demonstrated via application to a 2D methane combustion experiment simulated by the CFD. The model trained by 40 data points produces overall normalized mean absolute errors of 1.89% for CH4 mass fraction, which is even better than the models constructed by the other generation models with 800 data points. Besides, it is 7 times faster than CFD model. This approach requires only a small amount of training data to quickly build an accurate and computationally cheaper CFD surrogate model, providing a basis for deploying virtual sensors, visualizing internal reaction processes, conducting rapid reaction analysis and exploring optimization of reaction processes.

       

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