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• W2509372996 abstract "A new reduced-order model based on trajectory piecewise quadratic (TPWQ) approximations and proper orthogonal decomposition (POD) is introduced and applied for subsurface oil–water flow simulation. The method extends existing techniques based on trajectory piecewise linear (TPWL) approximations by incorporating second-derivative terms into the reduced-order treatment. Both the linear and quadratic reduced-order methods, referred to as POD-TPWL and POD-TPWQ, entail the representation of new solutions as expansions around previously simulated high-fidelity (full-order) training solutions, along with POD-based projection into a low-dimensional space. POD-TPWQ entails significantly more offline preprocessing than POD-TPWL as it requires generating and projecting several third-order (Hessian-type) terms. The POD-TPWQ method is implemented for two-dimensional systems. Extensive numerical results demonstrate that it provides consistently better accuracy than POD-TPWL, with speedups of about two orders of magnitude relative to high-fidelity simulations for the problems considered. We demonstrate that POD-TPWQ can be used as an error estimator for POD-TPWL, which motivates the development of a trust-region-based optimization framework. This procedure uses POD-TPWL for fast function evaluations and a POD-TPWQ error estimator to determine when retraining, which entails a high-fidelity simulation, is required. Optimization results for an oil–water problem demonstrate the substantial speedups that can be achieved relative to optimizations based on high-fidelity simulation." @default.
• W2509372996 created "2016-09-16" @default.
• W2509372996 creator A5002057296 @default.
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• W2509372996 date "2016-12-01" @default.
• W2509372996 modified "2023-10-16" @default.
• W2509372996 title "Trajectory piecewise quadratic reduced-order model for subsurface flow, with application to PDE-constrained optimization" @default.
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• W2509372996 doi "https://doi.org/10.1016/j.jcp.2016.08.032" @default.
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