Instabilities in non-ideal fluids
Type
Articles dans des revues avec comité de lectureDate
2019Journal
Journal of Fluid MechanicsRésumé
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.
Fichier(s) constituant cette publication
- Nom:
- DYNFLUID_JFM_2019_ROBINET.pdf
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- 1.313Mo
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- Article
- Fin d'embargo:
- 2020-04-04
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