Imperial College London
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Prof Francesco Montomoli

Faculty of Engineering, Department of Aeronautics

Professor in Computational Aerodynamics
 
 
 
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Contact

 

+44 (0)20 7594 5151f.montomoli Website

 
 
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Location

 

215City and Guilds BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Pepper:2021:10.1038/s41598-021-93280-y,
author = {Pepper, N and Gaymann, A and Montomoli, F and Sharma, S},
doi = {10.1038/s41598-021-93280-y},
journal = {Scientific Reports},
pages = {1--11},
title = {Local bi-fidelity field approximation with knowledge based neural networks for computational fluid dynamics},
url = {http://dx.doi.org/10.1038/s41598-021-93280-y},
volume = {11},
year = {2021}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - This work presents a machine learning based method for bi-fidelity modelling. The method, a Knowledge Based Neural Network (KBaNN), performs a local, additive correction to the outputs of a coarse computational model and can be used to emulate either experimental data or the output of a more accurate, but expensive, computational model. An advantage of the method is that it can scale easily with the number of input and output features. This allows bi-fidelity modelling approaches to be applied to a wide variety of problems, for instance in the bi-fidelity modelling of fields. We demonstrate this aspect in this work through an application to Computational Fluid Dynamics, in which local corrections to a velocity field are performed by the KBaNN to account for mesh effects. KBaNNs were trained to make corrections to the free-stream velocity field and the boundary layer. They were trained on a limited data-set consisting of simple two-dimensional flows. The KBaNNs were then tested on a flow over a more complex geometry, a NACA 2412 airfoil. It was demonstrated that the KBaNNs were still able to provide a local correction to the velocity field which improved its accuracy. The ability of the KBaNNs to generalise to flows around new geometries that share similar physics is encouraging. Through knowledge based neural networks it may be possible to develop a system for bi-fidelity, computer based design which uses data from past simulations to inform its predictions.
AU  - Pepper,N
AU  - Gaymann,A
AU  - Montomoli,F
AU  - Sharma,S
DO  - 10.1038/s41598-021-93280-y
EP  - 11
PY  - 2021///
SN  - 2045-2322
SP  - 1
TI  - Local bi-fidelity field approximation with knowledge based neural networks for computational fluid dynamics
T2  - Scientific Reports
UR  - http://dx.doi.org/10.1038/s41598-021-93280-y
UR  - https://www.nature.com/articles/s41598-021-93280-y
UR  - http://hdl.handle.net/10044/1/90596
VL  - 11
ER  -
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