[KDD 2020] Towards physics-informed deep learning for turbulent flow prediction

[KDD 2020] Towards physics-informed deep learning for turbulent flow prediction

Dec 16, 2020
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While deep learning has shown tremendous success in a wide range,of domains, it remains a grand challenge to incorporate physical,principles in a systematic manner to the design, training and inference of such models. In this paper, we aim to predict turbulent,flow by learning its highly nonlinear dynamics from spatiotemporal velocity fields of large-scale fluid flow simulations of relevance,to turbulence modeling and climate modeling. We adopt a hybrid,approach by marrying two well-established turbulent flow simulation techniques with deep learning. Specifically, we introduce,trainable spectral filters in a coupled model of Reynolds-averaged,Navier-Stokes (RANS) and Large Eddy Simulation (LES), followed,by a specialized U-net for prediction. Our approach, which we call,Turbulent-Flow Net (,TF-Net,), is grounded in a principled physics,model, yet offers the flexibility of learned representations. We compare our model,,TF-Net,, with state-of-the-art baselines and observe,significant reductions in error for predictions,60,frames ahead. Most,importantly, our method predicts physical fields that obey desirable,physical characteristics, such as conservation of mass, whilst faithfully emulating the turbulent kinetic energy field and spectrum,,which are critical for accurate prediction of turbulent flows.

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