Mechanism of sweep event attenuation using micro-cavities in a turbulent boundary layer
| Autor: | Rey Chin, Anthony C. Zander, Anton Silvestri, Benjamin S. Cazzolato, Farzin Ghanadi, Maziar Arjomandi |
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| Rok vydání: | 2018 |
| Předmět: |
Fluid Flow and Transfer Processes
Physics Mechanical Engineering Attenuation Computational Mechanics 02 engineering and technology Reynolds stress Mechanics Condensed Matter Physics 01 natural sciences GeneralLiterature_MISCELLANEOUS Spectral line 010305 fluids & plasmas Boundary layer Wavelength 020303 mechanical engineering & transports 0203 mechanical engineering Volume (thermodynamics) Mechanics of Materials 0103 physical sciences sense organs Energy (signal processing) Intensity (heat transfer) |
| Zdroj: | Physics of Fluids. 30:055108 |
| ISSN: | 1089-7666 1070-6631 |
| Popis: | Cavity arrays have been identified as a potential passive device to disrupt and capture sweep events, which are responsible for the excess Reynolds stresses in the boundary layer. In the present study, the mechanism of the attenuation of captured sweep events has been analyzed, as well as the non-linear relationship between the volume of the backing cavity and the reduction in sweep intensity. The influence of cavity array on the turbulent boundary layer has been analyzed, with a total of six different backing cavity arrangements with varying volumes. Three of the backing cavities have been used to determine the non-linear relationship between the effectiveness of the cavity array in reducing sweep intensity and the volume of the backing cavity. The other three have been used to determine the mechanism by which the arrays manipulate the captured sweep events. The pre-multiplied energy spectra of multiple velocity histories were significantly reduced, by up to 12.5%, in the low and mid-range wavelength values (λx+ |
| Databáze: | OpenAIRE |
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