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- W3201087462 abstract "Large-eddy simulations are used to investigate the origin of the wake asymmetry and symmetry behind notchback Ahmed bodies. Two different effective backlight angles, ${beta _1} = 17.8mathrm{^circ }$ and ${beta _2} = 21.0mathrm{^circ }$ , are simulated resulting in wake asymmetry and symmetry in flows without external perturbations, in agreement with previous experimental observations. In particular, the asymmetric case presents a bi-stable nature showing, in a random fashion, two stable mirrored states characterized by a left or right asymmetry for long periods. A random switch and several attempts to switch between the bi-stability are observed. The asymmetry of the flow is ascribed to the asymmetric separations and reattachments in the wake. The deflection of the near-wall flow structures behind the slant counteracting the asymmetry drives the wake to be temporarily symmetric, triggering the switching process of the bi-stable wake. The consequence of deflection that forces the flow structure to form on the opposite side of the slant is the decisive factor for a successful switch. Modal analysis applying proper orthogonal decomposition is used for the exploration of the wake dynamics of the bi-stable nature observed." @default.
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- W3201087462 date "2021-09-15" @default.
- W3201087462 modified "2023-10-07" @default.
- W3201087462 title "Numerical investigation of the wake bi-stability behind a notchback Ahmed body" @default.
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- W3201087462 doi "https://doi.org/10.1017/jfm.2021.748" @default.
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