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• W4387675398 abstract "Unstable motions of bridge stay cables have been observed on site and in wind tunnel tests when a cable is yawed at certain orientations to wind. To uncover the underlying mechanisms, flow around a circular cylinder at a yaw angle of 30° has been numerically analyzed in the current study using delayed detached eddy simulation (DDES) at Re=104. A comparison with the reference normal flow case indicates the presence of a more coherent span-wise flow structure when the cylinder is yawed at 30°. The application of proper orthogonal decomposition further reveals that at this orientation, a synchronized flow structure exists, which is characterized by continuous anti-symmetric pressure blocks. In addition, a low-frequency flow fluctuation has been identified, the Strouhal number of which is roughly a quarter of that of the conventional Kármán vortex shedding. The pivotal role of axial flow in the intermittent amplification of cylinder sectional lift and the subsequent span-wise propagation of this enhanced local lift event has been revealed. The former is evident from the low-frequency sectional lift peaks occurred during vortex shedding, whereas the propagation speed associated with the latter is in good agreement with the span-wise component of the incoming flow speed. The temporal and spatial impact of axial flow on the surrounding flow structure of the cylinder may serve as a periodic excitation source, which could trigger an unstable response of a cylinder. This, in the context of bridge stay cables, could possibly contribute to the onset mechanism of dry cable galloping." @default.
• W4387675398 created "2023-10-17" @default.
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• W4387675398 date "2023-10-01" @default.
• W4387675398 modified "2023-10-17" @default.
• W4387675398 title "Numerical study of flow characteristics around a 30° yawed circular cylinder at Re=104" @default.
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• W4387675398 doi "https://doi.org/10.1063/5.0172648" @default.
• W4387675398 hasPublicationYear "2023" @default.
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