Quantifying kinetic uncertainty in turbulent combustion simulations using active subspaces
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 approa...
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier BV
2020
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| Online Access: | https://hdl.handle.net/1721.1/126335 |
| _version_ | 1826208980936949760 |
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| author | Marzouk, Youssef M |
| author2 | Massachusetts Institute of Technology. Department of Aeronautics and Astronautics |
| author_facet | Massachusetts Institute of Technology. Department of Aeronautics and Astronautics Marzouk, Youssef M |
| author_sort | Marzouk, Youssef M |
| collection | MIT |
| description | 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. |
| first_indexed | 2024-09-23T14:15:47Z |
| format | Article |
| id | mit-1721.1/126335 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T14:15:47Z |
| publishDate | 2020 |
| publisher | Elsevier BV |
| record_format | dspace |
| spelling | mit-1721.1/1263352022-10-01T20:11:49Z Quantifying kinetic uncertainty in turbulent combustion simulations using active subspaces Marzouk, Youssef M Massachusetts Institute of Technology. Department of Aeronautics and Astronautics 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. National Natural Science Foundation of China (Grant 91441202) National Natural Science Foundation of China (Grant 51476087) 2020-07-23T13:37:11Z 2020-07-23T13:37:11Z 2018-07 2018-06 2019-10-30T12:33:52Z Article http://purl.org/eprint/type/JournalArticle 1540-7489 https://hdl.handle.net/1721.1/126335 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) en 10.1016/J.PROCI.2018.06.206 Proceedings of the Combustion Institute Creative Commons Attribution-NonCommercial-NoDerivs License http://creativecommons.org/licenses/by-nc-nd/4.0/ application/pdf Elsevier BV Other repository |
| spellingShingle | Marzouk, Youssef M Quantifying kinetic uncertainty in turbulent combustion simulations using active subspaces |
| title | Quantifying kinetic uncertainty in turbulent combustion simulations using active subspaces |
| title_full | Quantifying kinetic uncertainty in turbulent combustion simulations using active subspaces |
| title_fullStr | Quantifying kinetic uncertainty in turbulent combustion simulations using active subspaces |
| title_full_unstemmed | Quantifying kinetic uncertainty in turbulent combustion simulations using active subspaces |
| title_short | Quantifying kinetic uncertainty in turbulent combustion simulations using active subspaces |
| title_sort | quantifying kinetic uncertainty in turbulent combustion simulations using active subspaces |
| url | https://hdl.handle.net/1721.1/126335 |
| work_keys_str_mv | AT marzoukyoussefm quantifyingkineticuncertaintyinturbulentcombustionsimulationsusingactivesubspaces |