“Feasibility of Deep Neural Network Surrogate Models in Fluid Dynamics”

Authors: Niels C. Bender, Torben Ole Andersen and Henrik C. Pedersen,
Affiliation: Aalborg University
Reference: 2019, Vol 40, No 2, pp. 71-87.

Keywords: Artificial Neural Networks, CFD, Digital Valves, Flow-induced Forces, Reduced Order Models, Lumped Parameter Models

Abstract: This paper studies reduced-order-models for the fluid flow problem of a digital valve, and whether it may efficiently be formulated by a deep Artificial Neural Network (ANN) to model e.g. the valve flow, flow-induced force, stiction phenomena and steep local pressure gradients that arise before plunger impact, which may otherwise require CFD to be accurately modeled. Several methodologies are investigated to evaluate both the required computation time and the accuracy. The accuracy is benchmarked against CFD solutions of flows and forces. As basis for comparison an analytical model is proposed where some fitting parameters are allowed, and the equation is tested outside its fitting range. A similar model is built as a deep ANN which is trained with data from the analytical model to investigate the amount of data required for an ANN and its fitting capabilities. The results show that in higher dimensions the required training data can be maintained low if data is structured by a Latin Hypercube, otherwise the amount becomes infeasible. This makes an ANN surrogate feasible when compared to a look-up table, and may be expanded to higher dimension where dynamical effects are included. However, the required data and computational cost for this is too extensive for the valve design considered as basis for the analysis. Instead, for this specific problem, the derived analytical model is sufficient to describe the valve dynamics and reduces the computation time significantly.

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DOI forward links to this article:
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BibTeX:
@article{MIC-2019-2-1,
  title={{Feasibility of Deep Neural Network Surrogate Models in Fluid Dynamics}},
  author={Bender, Niels C. and Andersen, Torben Ole and Pedersen, Henrik C.},
  journal={Modeling, Identification and Control},
  volume={40},
  number={2},
  pages={71--87},
  year={2019},
  doi={10.4173/mic.2019.2.1},
  publisher={Norwegian Society of Automatic Control}
};