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• W2898025025 abstract "Approximate Bayesian computation (ABC) is a data-driven technique that uses many low-cost numerical simulations to estimate unknown physical or model parameters (e.g., boundary conditions and material properties), as well as their uncertainties, given reference data from real-world experiments or higher-fidelity numerical simulations. In this study, ABC is used to estimate unknown parameters in complex thermal-fluid flows, and the technique is demonstrated on a periodically forced high-temperature jet and a steadily forced helium-air plume. In the first case, computational reference data are used to assess the accuracy of ABC when estimating the frequency, amplitude, and mean of the periodic velocity forcing at the jet inlet. These tests show that ABC provides accurate and reasonably certain estimates of inflow parameters even when the model simulations imperfectly represent the physics underlying the reference data. These tests also show that measurements far from the inlet can be used to perform the estimation, and that temperature measurements can be used to infer velocity inflow parameters. For the second case, ABC is used to estimate the inlet Richardson number and its uncertainty given experimental measurements of the Strouhal number within the plume. Once again, the approach is able to accurately estimate unknown parameters with relatively low uncertainty. As a result, ABC is shown to be a versatile technique for estimating unknown physical parameters when knowledge of a real-world system is limited or incomplete.1 MoreReceived 7 May 2018DOI:https://doi.org/10.1103/PhysRevFluids.3.104602©2018 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasCompressible flowsConvectionWakes & jetsFluid Dynamics" @default.
• W2898025025 created "2018-10-26" @default.
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• W2898025025 date "2018-10-11" @default.
• W2898025025 modified "2023-10-17" @default.
• W2898025025 title "Parameter estimation for complex thermal-fluid flows using approximate Bayesian computation" @default.
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• W2898025025 doi "https://doi.org/10.1103/physrevfluids.3.104602" @default.
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