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Design of Hybrid Reconstruction Scheme for Compressible Flow Using Data-Driven Methods

Published online by Cambridge University Press:  06 August 2020

A. Salazar Open the ORCID record for A. Salazar [Opens in a new window]  and
F. Xiao
A. Salazar*
Affiliation:
Department of Mechanical Engineering Tokyo Institute of TechnologyTokyo, Japan
F. Xiao
Affiliation:
Department of Mechanical Engineering Tokyo Institute of TechnologyTokyo, Japan
*
*Corresponding author ([email protected])
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Abstract

Existing numerical schemes used to solve the governing equations for compressible flow suffer from dissipation errors which tend to smear out sharp discontinuities. Hybrid schemes show potential improvements in this challenging problem; however, the solution quality of a hybrid scheme heavily depends on the criterion to switch between the different candidate reconstruction functions. This work presents a new type of switching criterion (or selector) using machine learning techniques. The selector is trained with randomly generated samples of continuous and discontinuous data profiles, using the exact solution of the governing equation as a reference. Neural networks and random forests were used as the machine learning frameworks to train the selector, and it was later implemented as the indicator function in a hybrid scheme which includes THINC and WENO-Z as the candidate reconstruction functions. The trained selector has been verified to be effective as a reliable switching criterion in the hybrid scheme, which significantly improves the solution quality for both advection and Euler equations.

Keywords

Computational Fluid DynamicsCompressible FlowMachine LearningHybrid Schemes
Type
Research Article
Information
Journal of Mechanics , Volume 36 , Issue 5 , October 2020 , pp. 675 - 689
Copyright
Copyright © 2020 The Society of Theoretical and Applied Mechanics

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