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• W3201527114 abstract "Accurate simulation of turbulent flow with separation is an important but challenging problem. In this paper, a data-driven Reynolds-averaged turbulence modeling approach, field inversion and machine learning is implemented to modify the Spalart–Allmaras model separately on three cases, namely, the S809 airfoil, a periodic hill and the GLC305 airfoil with ice shape 944. Field inversion based on a discrete adjoint method is used to quantify the model-form uncertainty with limited experimental data. An artificial neural network is trained to predict the model corrections with local flow features to extract generalized modeling knowledge. Physical knowledge of the nonequilibrium turbulence in the separating shear layer is considered when setting the prior model uncertainty. The results show that the model corrections from the field inversion demonstrate strong consistency with the underlying physical mechanism of nonequilibrium turbulence. The quantity of interest from the observation data can be reproduced with relatively high accuracy by the augmented model. In addition, the validation in similar flow conditions shows a certain extent of generalization ability." @default.
• W3201527114 created "2021-09-27" @default.
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• W3201527114 date "2022-08-01" @default.
• W3201527114 modified "2023-10-17" @default.
• W3201527114 title "Data-driven turbulence modeling in separated flows considering physical mechanism analysis" @default.
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• W3201527114 doi "https://doi.org/10.1016/j.ijheatfluidflow.2022.109004" @default.
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