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• W4297678927 abstract "A time-averaged error indicator with POD- h Greedy is developed to drive parametric model order reduction (pMOR) for 2D unsteady natural convection in a high-aspect ratio slot parameterized with the Prandtl number, Rayleigh number, and slot angle with respect to the gravity. The error indicator is extended to accommodate the energy equation and Leray regularization. Despite being two-dimensional and laminar, the target flow regime presents several challenges: 1) there is a bifurcation in the angle parameter space; 2) the solution can be multivalued, even at steady state; and 3) the solution exhibits spatio-temporal chaos at several points in the parameter space. The authors explore several reduced-order models (ROMs) and demonstrate that Leray-regularized Galerkin ROMs provide a robust solution approach for this class of flows. They further demonstrate that error-indicated pMOR can efficiently predict several QOIs, such as mean flow, mean Nusselt number and mean turbulent kinetic energy, even in the presence of a bifurcation. Finally, they show that spatio-temporal chaos can lead to lack of reproducibility in both the full-order model and the reduced-order model and that the variance in the full-order model provides a lower bound on the pMOR error in these cases." @default.
• W4297678927 created "2022-09-30" @default.
• W4297678927 creator A5041558213 @default.
• W4297678927 creator A5081088881 @default.
• W4297678927 date "2022-09-07" @default.
• W4297678927 modified "2023-09-27" @default.
• W4297678927 title "Parametric model-order-reduction development for unsteady convection" @default.
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• W4297678927 doi "https://doi.org/10.3389/fphy.2022.903169" @default.
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