Streamwise self-similarity and log scaling in turbulent boundary layers
| Autor: | Shivsai Ajit Dixit, O. N. Ramesh |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Self-similarity
Turbulence Advection Mechanical Engineering Mathematical analysis Zero (complex analysis) Boundary (topology) Reynolds number Condensed Matter Physics 01 natural sciences 010305 fluids & plasmas Physics::Fluid Dynamics Boundary layer symbols.namesake Mechanics of Materials 0103 physical sciences symbols 010306 general physics Scaling Mathematics |
| Zdroj: | Journal of Fluid Mechanics. 851 |
| ISSN: | 1469-7645 0022-1120 |
| DOI: | 10.1017/jfm.2018.506 |
| Popis: | High Reynolds number is thought to be a fundamental condition essential for the occurrence of log scaling in turbulent boundary layers. However, while log variation of mean velocity is seen to occur at moderate Reynolds numbers in the traditional boundary layer literature, log variations of higher-order moments are evident only at much higher Reynolds numbers, as reported in recent experiments. This observation suggests that, underlying the occurrence of log scaling in turbulent boundary layers, there exists a more fundamental condition (apart from the largeness of Reynolds number) – the requirement of self-similar evolution of a mean-flow quantity of interest along a mean-flow streamline, i.e. the mean advection of the scaled mean quantity of interest is required to be zero. Experimental data from the literature provide strong support for this proposal. |
| Databáze: | OpenAIRE |
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