Quantifying kinetic uncertainty in turbulent combustion simulations using active subspaces
Name
1-s2.0-S1540748918303924-main.pdf
Description
Accepted version
Size
1017.46 KB
Format
Adobe PDF
Checksum (MD5)
3195dfdab711d49b95f78cb7fcb55dd1
Author(s)
Marzouk, Youssef M
Date Issued
July 2018
Journal
Proceedings of the Combustion Institute
Publisher
Elsevier BV
Citation
Ji, Weiqi et al. “Quantifying kinetic uncertainty in turbulent combustion simulations using active subspaces.” Proceedings of the Combustion Institute, vol. 37, no. 2, 2019, pp. 2175-2182 © 2019 The Author(s)
Version
Author's final manuscript
Abstract
Uncertainty quantification in expensive turbulent combustion simulations usually adopts response surface techniques to accelerate Monte Carlo sampling. However, it is computationally intractable to build response surfaces for high-dimensional kinetic parameters. We employ the active subspaces approach to reduce the dimension of the parameter space, such that building a response surface on the resulting low-dimensional subspace requires many fewer runs of the expensive simulation, rendering the approach suitable for various turbulent combustion models. We demonstrate this approach in simulations of the Cabra H 2 /N 2 jet flame, propagating the uncertainties of 21 kinetic parameters to the liftoff height. We identify a one-dimensional active subspace for the liftoff height using 84 runs of the simulations, from which a response surface with a one-dimensional input is built; the probability distribution of the liftoff height is then characterized by evaluating a large number of samples using the inexpensive response surface. In addition, the active subspace provides a global sensitivity metric for determining the most influential reactions. Comparison with autoignition tests reveals that the sensitivities to the HO 2 -related reactions in the Cabra flame are promoted by the diffusion processes. The present work demonstrates the capability of active subspaces in quantifying uncertainty in turbulent combustion simulations and provides physical insights into the flame via the active subspace-based sensitivity metric.
MIT Department
Massachusetts Institute of Technology. Department of Aeronautics and Astronautics
Terms of Use
Creative Commons Attribution-NonCommercial-NoDerivs License
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1016/J.PROCI.2018.06.206
