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• W3205682022 abstract "A ubiquitous challenge in design space exploration or uncertainty quantification of complex engineering problems is the minimization of computational cost. A useful tool to ease the burden of solving such systems is model reduction. This work considers a stochastic model reduction method (SMR), in the context of polynomial chaos expansions, where low-fidelity (LF) samples are leveraged to form a stochastic reduced basis. The reduced basis enables the construction of a bi-fidelity (BF) estimate of a quantity of interest from a small number of high-fidelity (HF) samples. A successful BF estimate approximates the quantity of interest with accuracy comparable to the HF model and computational expense close to the LF model. We develop new error bounds for the SMR approach and present a procedure to practically utilize these bounds in order to assess the appropriateness of a given pair of LF and HF models for BF estimation. The effectiveness of the SMR approach, and the utility of the error bound are presented in three numerical examples." @default.
• W3205682022 created "2021-10-25" @default.
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• W3205682022 date "2021-10-09" @default.
• W3205682022 modified "2023-10-07" @default.
• W3205682022 title "Bi-fidelity reduced polynomial chaos expansion for uncertainty quantification" @default.
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• W3205682022 doi "https://doi.org/10.1007/s00466-021-02096-0" @default.
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