Turbulent wake dynamics and flow characteristics over typical hilly terrain: A proper orthogonal decomposition and dynamic mode decomposition analysis DOI
Weicheng Hu, Qingshan Yang, Tong Zhou

и другие.

Physics of Fluids, Год журнала: 2025, Номер 37(5)

Опубликована: Май 1, 2025

The turbulent wake dynamics over hilly terrain with typical topographic shapes and slopes under different oncoming flow conditions are numerically investigated using large-eddy simulations, followed by proper orthogonal decomposition (POD) dynamic mode (DMD) analysis. First, the effects of shape, slope inflow turbulence on statistical spectral characteristics clarified. Then, dominant patterns in identified POD DMD, respectively. Finally, fields reconstructed DMD. results show that peak frequencies at half topography elevation decrease as shape transitions from three-dimensional to two-dimensional but increase decreasing intensity. From DMD analyses, it is demonstrated steep predominantly governed separated shear layer shed hillside hilltop horizontal vertical planes, Some discrepancies observed higher-order modes extracted indicating strong interactions among multi-frequency eddy motions wake. Moreover, incoming can be effectively only 30% reasonable accuracy. reconstruction errors primarily concentrated within due nonlinearity this region.

Язык: Английский

Turbulent wake dynamics and flow characteristics over typical hilly terrain: A proper orthogonal decomposition and dynamic mode decomposition analysis DOI
Weicheng Hu, Qingshan Yang, Tong Zhou

и другие.

Physics of Fluids, Год журнала: 2025, Номер 37(5)

Опубликована: Май 1, 2025

The turbulent wake dynamics over hilly terrain with typical topographic shapes and slopes under different oncoming flow conditions are numerically investigated using large-eddy simulations, followed by proper orthogonal decomposition (POD) dynamic mode (DMD) analysis. First, the effects of shape, slope inflow turbulence on statistical spectral characteristics clarified. Then, dominant patterns in identified POD DMD, respectively. Finally, fields reconstructed DMD. results show that peak frequencies at half topography elevation decrease as shape transitions from three-dimensional to two-dimensional but increase decreasing intensity. From DMD analyses, it is demonstrated steep predominantly governed separated shear layer shed hillside hilltop horizontal vertical planes, Some discrepancies observed higher-order modes extracted indicating strong interactions among multi-frequency eddy motions wake. Moreover, incoming can be effectively only 30% reasonable accuracy. reconstruction errors primarily concentrated within due nonlinearity this region.

Язык: Английский

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