Computing Residual Diffusivity by Adaptive Basis Learning via Super-Resolution Deep Neural Networks

Computing Residual Diffusivity by Adaptive Basis Learning via Super-Resolution Deep Neural Networks
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通过超分辨率深度神经网络的自适应基础学习计算残余扩散率

DOI:
10.1007/978-3-030-38364-0_25
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发表时间:
2020
期刊:
Applied Mathematics and Applications
影响因子:
--
通讯作者:
Yu, Yifeng
Yu, Yifeng
中科院分区:
--
文献类型:
--
作者:
Lyu, Jiancheng;Xin, Jack;Yu, Yifeng

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It is expensive to compute residual diffusivity in chaotic in-compressible flows by solving advection-diffusion equation due to the formation of sharp internal layers in the advection dominated regime. Proper orthogonal decomposition (POD) is a classical method to construct a small number of adaptive orthogonal basis vectors for low cost computation based on snapshots of fully resolved solutions at a particular molecular diffusivity. The quality of POD basis deteriorates if it is applied to. To improve POD, we adapt a super-resolution generative adversarial deep neural network (SRGAN) to train a nonlinear mapping based on snapshot data at two values of. The mapping models the sharpening effect on internal layers asbecomes smaller. We show through numerical experiments that after applying such a mapping to snapshots, the prediction accuracy of residual diffusivity improves considerably that of the standard POD.
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