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On the dynamical relevance of coherent vortical structures in turbulent boundary layers
| Content Provider | Scilit |
|---|---|
| Author | Pirozzoli, Sergio Bernardini, Matteo Grasso, Francesco |
| Copyright Year | 2010 |
| Description | The dynamical relevance of vortex tubes and vortex sheets in a wall-bounded supersonic turbulent flow at Mach numberM= 2 and Reynolds $numberRe_{θ}$≈ 1350 is quantitatively analysed. The flow in the viscous sublayer and in the buffer region is characterized by intense, elongated vorticity tongues forming a shallow angle with respect to the wall, whose characteristic length isO(200) wall units and whose size in the cross-stream direction isO(50) wall units. The formation of vortex tubes takes place starting $fromy^{+}$≈ 10, and it is mainly associated with the roll-up and the interaction of vortex sheets. The analysis of the non-local dynamical effect of tubes and sheets suggests that the latter have a more important collective effect, being closely associated with low-speed streaks, and being responsible for a substantial contribution to the mean momentum balance and to the production of turbulence kinetic energy and enstrophy. |
| Related Links | https://www.cambridge.org/core/services/aop-cambridge-core/content/view/CFCAF1F7636B1A21654EB7268AB849FC/S0022112009993156a.pdf/div-class-title-on-the-dynamical-relevance-of-coherent-vortical-structures-in-turbulent-boundary-layers-div.pdf |
| Ending Page | 349 |
| Page Count | 25 |
| Starting Page | 325 |
| ISSN | 00221120 |
| e-ISSN | 14697645 |
| DOI | 10.1017/s0022112009993156 |
| Journal | Journal of Fluid Mechanics |
| Volume Number | 648 |
| Language | English |
| Publisher | Cambridge University Press (CUP) |
| Publisher Date | 2010-04-10 |
| Access Restriction | Open |
| Subject Keyword | Journal of Fluid Mechanics Fluids and Plasmas Physics Turbulent Boundary Layer |
| Content Type | Text |
| Resource Type | Article |
| Subject | Applied Mathematics Mechanics of Materials Condensed Matter Physics Mechanical Engineering |
