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Article Dans Une Revue Journal of Fluid Mechanics Année : 2019

Instabilities in non-ideal fluids

Résumé

The recent study of Ren et al. (J. Fluid Mech., vol. 871, 2019, pp. 831–864) investigated the hydrodynamic linear stability of a compressible boundary layer over an insulated flat plate for a non-ideal gas (supercritical $\text{CO}_{2}$). In particular, the authors showed that in the transcritical regime (across the pseudo-critical line) the flow is strongly convectively unstable due to the co-existence of two unstable modes: Mode I, related to Tollmien–Schlichting instabilities and a new inviscid two-dimensional mode (Mode II) with a spatial growth rate one order of magnitude larger than Mode I for high Eckert numbers. In contrast to the transcritical regime, in the sub- and supercritical regimes, Mode II does not exist. Only Mode I drives the instabilities: viscous and two-dimensional for the subcritical regime and inflectional and three-dimensional for the supercritical regime.
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Dates et versions

hal-02464549 , version 1 (03-02-2020)

Identifiants

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Jean-Christophe Robinet, Xavier Gloerfelt. Instabilities in non-ideal fluids. Journal of Fluid Mechanics, 2019, 880, pp.1-4. ⟨10.1017/jfm.2019.719⟩. ⟨hal-02464549⟩
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