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2021-09-11T16:02:16+05:01
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2021-09-28T07:47:28+00:00
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Downloaded from https://www.cambridge.org/core. Chalmers Tekniska Högskola, on 28 Sep 2021 at 07:47:28, subject to the Cambridge Core terms of use, available at https://www.cambridge.org/core/terms.
Not for further distribution unless allowed by the License or with the express written permission of Cambridge University Press.
https://doi.org/10.1017/jfm.2021.748
Chalmers Tekniska Högskola
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/Subject(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\(1\) = 17.8 degrees and beta\(2\) = 21.0 degrees, 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.)
/Author(He, K., Minelli, G., Wang, J. et al)
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/Keywords(wakes, )
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/Title(Numerical investigation of the wake bi-stability behind a notchback Ahmed body)
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