Autonomous uncertainty quantification for discontinuous models using multivariate pade approximations
Problems in turbomachinery computational fluid dynamics (CFD) are often characterized by nonlinear and discontinuous responses. Ensuring the reliability of uncertainty quantification (UQ) codes in such conditions, in an autonomous way, is challenging. In this work, we suggest a new approach that com...
| मुख्य लेखकों: | , , , |
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| स्वरूप: | Journal article |
| प्रकाशित: |
American Society of Mechanical Engineers
2018
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| _version_ | 1826304383853264896 |
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| author | Ahlfeld, R Montomoli, F Carnevale, M Salvadori, S |
| author_facet | Ahlfeld, R Montomoli, F Carnevale, M Salvadori, S |
| author_sort | Ahlfeld, R |
| collection | OXFORD |
| description | Problems in turbomachinery computational fluid dynamics (CFD) are often characterized by nonlinear and discontinuous responses. Ensuring the reliability of uncertainty quantification (UQ) codes in such conditions, in an autonomous way, is challenging. In this work, we suggest a new approach that combines three state-of-the-art methods: multivariate Padé approximations, optimal quadrature subsampling (OQS), and statistical learning. Its main component is the generalized least-squares multivariate Padé- Legendre (PL) approximation. PL approximations are globally fitted rational functions that can accurately describe discontinuous nonlinear behavior. They need fewer model evaluations than local or adaptive methods and do not cause the Gibbs phenomenon like continuous polynomial chaos methods. A series of modifications of the Padé algorithm allows us to apply it to arbitrary input points instead of optimal quadrature locations. This property is particularly useful for industrial applications, where a database of CFD runs is already available, but not in optimal parameter locations. One drawback of the PL approximation is that it is nontrivial to ensure reliability. To improve stability, we suggest to couple it with OQS. Our reasoning is that least-squares errors, caused by an ill-conditioned design matrix, are the main source of error. Finally, we use statistical learning methods to check smoothness and convergence. The resulting method is shown to efficiently and correctly fit thousands of partly discontinuous response surfaces for an industrial film cooling and shock interaction problem using only nine CFD simulations. |
| first_indexed | 2024-03-07T06:16:59Z |
| format | Journal article |
| id | oxford-uuid:f16910df-e8b3-45c0-a166-43d2b3e8f4a1 |
| institution | University of Oxford |
| last_indexed | 2024-03-07T06:16:59Z |
| publishDate | 2018 |
| publisher | American Society of Mechanical Engineers |
| record_format | dspace |
| spelling | oxford-uuid:f16910df-e8b3-45c0-a166-43d2b3e8f4a12022-03-27T11:55:49ZAutonomous uncertainty quantification for discontinuous models using multivariate pade approximationsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:f16910df-e8b3-45c0-a166-43d2b3e8f4a1Symplectic Elements at OxfordAmerican Society of Mechanical Engineers2018Ahlfeld, RMontomoli, FCarnevale, MSalvadori, SProblems in turbomachinery computational fluid dynamics (CFD) are often characterized by nonlinear and discontinuous responses. Ensuring the reliability of uncertainty quantification (UQ) codes in such conditions, in an autonomous way, is challenging. In this work, we suggest a new approach that combines three state-of-the-art methods: multivariate Padé approximations, optimal quadrature subsampling (OQS), and statistical learning. Its main component is the generalized least-squares multivariate Padé- Legendre (PL) approximation. PL approximations are globally fitted rational functions that can accurately describe discontinuous nonlinear behavior. They need fewer model evaluations than local or adaptive methods and do not cause the Gibbs phenomenon like continuous polynomial chaos methods. A series of modifications of the Padé algorithm allows us to apply it to arbitrary input points instead of optimal quadrature locations. This property is particularly useful for industrial applications, where a database of CFD runs is already available, but not in optimal parameter locations. One drawback of the PL approximation is that it is nontrivial to ensure reliability. To improve stability, we suggest to couple it with OQS. Our reasoning is that least-squares errors, caused by an ill-conditioned design matrix, are the main source of error. Finally, we use statistical learning methods to check smoothness and convergence. The resulting method is shown to efficiently and correctly fit thousands of partly discontinuous response surfaces for an industrial film cooling and shock interaction problem using only nine CFD simulations. |
| spellingShingle | Ahlfeld, R Montomoli, F Carnevale, M Salvadori, S Autonomous uncertainty quantification for discontinuous models using multivariate pade approximations |
| title | Autonomous uncertainty quantification for discontinuous models using multivariate pade approximations |
| title_full | Autonomous uncertainty quantification for discontinuous models using multivariate pade approximations |
| title_fullStr | Autonomous uncertainty quantification for discontinuous models using multivariate pade approximations |
| title_full_unstemmed | Autonomous uncertainty quantification for discontinuous models using multivariate pade approximations |
| title_short | Autonomous uncertainty quantification for discontinuous models using multivariate pade approximations |
| title_sort | autonomous uncertainty quantification for discontinuous models using multivariate pade approximations |
| work_keys_str_mv | AT ahlfeldr autonomousuncertaintyquantificationfordiscontinuousmodelsusingmultivariatepadeapproximations AT montomolif autonomousuncertaintyquantificationfordiscontinuousmodelsusingmultivariatepadeapproximations AT carnevalem autonomousuncertaintyquantificationfordiscontinuousmodelsusingmultivariatepadeapproximations AT salvadoris autonomousuncertaintyquantificationfordiscontinuousmodelsusingmultivariatepadeapproximations |