Three dimensional structures of flow through a square cylinder with an upstream splitter plate and for several velo city ratios
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In the present paper, three-dimensional Fluid structures and wake characteristics are evaluated for a square cylinder with an upstream splitter plate. The splitter plate divides the incoming flow in two streams, the upper and lower one, existing between them a velocity ratio. Two different Reynolds numbers of 56 and 200 and three different velocity ratios are here considered. The effect of the mixing enhancement using a square cylinder located downstream of the splitter plate is evaluated. A Floquet analysis to compute the spanwise wavelengths of three dimensional disturbances appearing in the square cylinder wake with and without a splitter plate is performed. It is observed that the use of the detached splitter plate has a stabilizing effect at low velocity ratios. However, when the velocity ratio increases, the vortex shedding suffers a linear increase and the wake resembles that of a mixing layer. Vortex dislocations appear at ratios larger than 2, which points out the onset of a bifurcation to a more chaotic wake. The wavelength of this secondary instability has been measured by means of Floquet analysis and two-point correlations being in the order of 3.5D.
CitationEl Mansy, R., Sarwar, W., Rodriguez, I., Bergadà, J.M. Three dimensional structures of flow through a square cylinder with an upstream splitter plate and for several velo city ratios. A: International Conference on Computational Fluid Dynamics. "ICCFD10 Proceedings". 2018, p. 1-13.
- Departament de Mecànica de Fluids - Ponències/Comunicacions de congressos 
- Departament de Màquines i Motors Tèrmics - Ponències/Comunicacions de congressos 
- TUAREG - Turbulence and Aerodynamics in Mechanical and Aerospace Engineering Research Group - Ponències/Comunicacions de congressos 
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