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A physics-informed operator regression framework for extracting data-driven continuum models
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DOI：10.1016/j.cma.2020.113500.png)
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Abstract
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The application of deep learning toward discovery of data-driven models requires careful application of inductive biases to obtain a description of physics which is both accurate and robust. We present here a framework for discovering continuum models from high fidelity molecular simulation data. Our approach applies a neural network parameterization of governing physics in modal space, allowing a characterization of differential operators while providing structure which may be used to impose biases related to symmetry, isotropy, and conservation form. We demonstrate the effectiveness of our framework for a variety of physics, including local and nonlocal diffusion processes and single and multiphase flows. For the flow physics we demonstrate this approach leads to a learned operator that generalizes to system characteristics not included in the training sets, such as variable particle sizes, densities, and concentration. (C) 2020 Elsevier B.V. All rights reserved.
Keywords:
Physics-informed machine learning
Operator regression
Spectral methods
Continuum scale modeling
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