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A reduced order model for turbulent flows in the urban environment using machine learning

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Title: A reduced order model for turbulent flows in the urban environment using machine learning
Authors: Xiao, D
Heaney, CE
Mottet, L
Fang, F
Lin, W
Navon, IM
Guo, Y
Matar, OK
Robins, AG
Pain, CC
Item Type: Journal Article
Abstract: To help create a comfortable and healthy indoor and outdoor environment in which to live, there is a need to understand turbulent air flows within the urban environment. To this end, building on a previously reported method [1], we develop a fast-running Non-Intrusive Reduced Order Model (NIROM) for predicting the turbulent air flows found within an urban environment. To resolve larger scale turbulent fluctuations, we employ a Large Eddy Simulation (LES) model and solve the resulting computational model on unstructured meshes. The objective is to construct a rapid-running NIROM from these results that will have ‘similar’ dynamics to the original LES model. Based on Proper Orthogonal Decomposition (POD) and machine learning techniques, this Reduced Order Model (ROM) is six orders of magnitude faster than the high-fidelity LES model and we demonstrate how ‘similar’ it can be to the high-fidelity model by comparing statistical quantities such as the mean flows, Reynolds stresses and probability densities of the velocities. We also include validation of the high-fidelity model against data from wind tunnel experiments. This paper represents a key step towards the use of reduced order modelling for operational purposes with the tantalising possibility of it being used in place of Gaussian plume models, and the potential for greatly improved model fidelity and confidence.
Issue Date: 15-Jan-2019
Date of Acceptance: 19-Oct-2018
URI: http://hdl.handle.net/10044/1/64418
DOI: https://dx.doi.org/10.1016/j.buildenv.2018.10.035
ISSN: 0360-1323
Publisher: Elsevier BV
Start Page: 323
End Page: 337
Journal / Book Title: Building and Environment
Volume: 148
Copyright Statement: © 2018 Published by Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Sponsor/Funder: Engineering & Physical Science Research Council (E
Funder's Grant Number: RG80519
Keywords: 1201 Architecture
1202 Building
0502 Environmental Science And Management
Building & Construction
Publication Status: Published
Online Publication Date: 2018-11-15
Appears in Collections:Earth Science and Engineering
Chemical Engineering
Faculty of Natural Sciences
Faculty of Engineering