Data-driven reduced order model with temporal convolutional neural network

This paper presents a novel model reduction method based on proper orthogonal decomposition and temporal convolutional neural network. The method generates basis functions of the flow field by proper orthogonal decomposition, and the coefficients are taken as the low-dimensional features. Temporal convolutional neural network is used to construct the model for predicting low-dimensional features. In this work, the training data are obtained from high fidelity numerical simulation. Compared with recurrent networks, temporal convolutional neural network is more effective with fewer parameters. The model reduction method developed here depends only on the solution of flow field. The performance of the new reduced order model is evaluated using numerical case: flow past a cylinder. Experimental results illustrate that time cost is reduced by three orders of magnitude, and convolutional architecture is beneficial to construct reduced order model. The speed-up ratio is linear with the computational scale of the numerical simulation. (C) 2019 Elsevier B.V. All rights reserved.