Reduced order modeling of dynamical systems using artificial neural networks applied to water circulation

Abstract

General circulation models are essential tools in weather and hydrodynamic simulation. They solve discretized, complex physical equations in order to compute evolutionary states of dynamical systems, such as the hydrodynamics of a lake. However, high-resolution numerical solutions using such models are extremely computational and time consuming, often requiring a high performance computing architecture to be executed satisfactorily. Machine learning (ML)-based low-dimensional surrogate models are a promising alternative to speed up these simulations without undermining the quality of predictions. In this work, we develop two examples of fast, reliable, low-dimensional surrogate models to produce a 36 hour forecast of the depth-averaged hydrodynamics at Lake George NY, USA. Our ML approach uses two widespread artificial neural network (ANN) architectures: fully connected neural networks and long short-term memory. These ANN architectures are first validated in the deterministic and chaotic regimes of the Lorenz system and then combined with proper orthogonal decomposition (to reduce the dimensionality of the incoming input data) to emulate the depth-averaged hydrodynamics of a flow simulator called SUNTANS. Results show the ANN-based reduced order models have promising accuracy levels (within 6% of the prediction range) and advocate for further investigation into hydrodynamic applications.

arXiv comment20 pages, 10 figures, CFDML2020, Lecture Notes in Computer Science 2020

References in corpus (7)

• Deep Learning in Neural Networks: An Overview
• Machine Learning for Fluid Mechanics
• A Physics Informed Machine Learning Approach for Reconstructing Reynolds Stress Modeling Discrepancies Based on DNS Data
• Data-Driven Forecasting of High-Dimensional Chaotic Systems with Long Short-Term Memory Networks
• Deep Fluids: A Generative Network for Parameterized Fluid Simulations
• Construction of Reduced Order Models for Fluid Flows Using Deep Feedforward Neural Networks
• Accelerating Physics-Based Simulations Using Neural Network Proxies: An Application in Oil Reservoir Modeling