Experimental study of the bistability in the wake behind three cylinders in triangular arrangement
| Autor: | Luiz Augusto Magalhães Endres, Sergio Viçosa Möller, Alexandre Vagtinski de Paula |
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| Rok vydání: | 2013 |
| Předmět: |
Physics
Bistability Turbulence Mechanical Engineering Applied Mathematics General Engineering Aerospace Engineering Aerodynamics Mechanics Wake Industrial and Manufacturing Engineering Cylinder (engine) law.invention Physics::Fluid Dynamics Wavelet Flow (mathematics) law Automotive Engineering Electronic engineering Upstream (networking) |
| Zdroj: | Journal of the Brazilian Society of Mechanical Sciences and Engineering. 35:163-176 |
| ISSN: | 1806-3691 1678-5878 |
| DOI: | 10.1007/s40430-013-0019-9 |
| Popis: | By means of hot wire anemometry technique and flow visualizations, the presence of the phenomenon of the bistability around three cylinders in two triangular arrangements is investigated in an aerodynamic channel and in a water channel. Bistability occurs in flows over sets of bluff bodies forming a flip-flopping wake characterized by a biased flow switching at irregular intervals, which can represent an additional source of dynamic instabilities. Results of flow around three cylinders in triangular arrangement are presented for two configurations: one cylinder upstream and two downstream, and vice versa. The experimental data are analyzed by means of statistical, spectral and wavelet tools. The joint analysis in time and frequency domains through wavelets allows the detection of non-permanent flow structures. The results show the presence of bistable flow in the configuration with one cylinder upstream and two downstream, but no bistable effect was detected in the second configuration, where the flow shows a distinct shedding frequency. |
| Databáze: | OpenAIRE |
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