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Instabilities in laminar separation bubbles
| Content Provider | Scilit |
|---|---|
| Author | Robinet, J. -C. |
| Copyright Year | 2013 |
| Description | Wall-bounded flows, in their transition from a laminar state to turbulence, pass through a set of particular stages characterized by different physical processes. Among wall-bounded flows, separated flows have a special place because their dynamics can either be noise amplifiers or oscillators. For several years Marxen and co-workers have been studying the evolution of two- and three-dimensional perturbations in the laminar part of a laminar separation bubble. In Marxen et al. (J. Fluid Mech., vol. 728, 2013, p. 58) they study vortex formation and its evolution in laminar–turbulent transition in a forced separation bubble. By the combined use of numerical and experimental methods, different mechanisms of secondary instabilities have been highlighted: elliptic instability of vortex cores and hyperbolic instability responsible for three-dimensionality in the braid region. This work shows, for the first time in laminar separation bubbles, the first nonlinear stages of transition to turbulence of such a flow. However, since this type of flow is very sensitive to various environmental stresses, several scenarios for transition to turbulence remain to be explored. |
| Related Links | https://www.cambridge.org/core/services/aop-cambridge-core/content/view/62B1EF5C2CD6F33987AB318887095D51/S0022112013003558a.pdf/div-class-title-instabilities-in-laminar-separation-bubbles-div.pdf |
| Ending Page | 4 |
| Page Count | 4 |
| Starting Page | 1 |
| ISSN | 00221120 |
| e-ISSN | 14697645 |
| DOI | 10.1017/jfm.2013.355 |
| Journal | Journal of Fluid Mechanics |
| Volume Number | 732 |
| Language | English |
| Publisher | Cambridge University Press (CUP) |
| Publisher Date | 2013-10-10 |
| Access Restriction | Open |
| Subject Keyword | Journal of Fluid Mechanics Fluids and Plasmas Physics Boundary Layer Separation Nonlinear Instability Vortex Shedding |
| Content Type | Text |
| Resource Type | Article |
| Subject | Applied Mathematics Mechanics of Materials Condensed Matter Physics Mechanical Engineering |
