Study of the flow around a square cylinder with an upstream splitter plate
(English) This PhD mostly focuses in studding the flow around a square cylinder with an upstream splitter plate and considering different velocity ratios between the upper and lower inlet velocities. The PhD is based in three main studies: 1.-The flow instabilities, involving the transition from two...
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| Tipo de recurso: | tesis doctoral |
| Estado: | Versión publicada |
| Fecha de publicación: | 2023 |
| País: | España |
| Institución: | CBUC, CESCA |
| Repositorio: | TDR. Tesis Doctorales en Red |
| OAI Identifier: | oai:www.tdx.cat:10803/689271 |
| Acceso en línea: | http://hdl.handle.net/10803/689271 https://dx.doi.org/10.5821/dissertation-2117-396075 |
| Access Level: | acceso abierto |
| Palabra clave: | Àrees temàtiques de la UPC::Enginyeria mecànica 531/534 |
| Sumario: | (English) This PhD mostly focuses in studding the flow around a square cylinder with an upstream splitter plate and considering different velocity ratios between the upper and lower inlet velocities. The PhD is based in three main studies: 1.-The flow instabilities, involving the transition from two dimensional to three dimensional flow, the Hopt, Neimark Sacker bifurcations as well as the road to chaos, all of them were determined as a function of the velocity ratio. A parametric study was also performed involving the instabilities performance as a function of the splitter plate length and the distance splitter plate square cylinder. 2.-Two dimensional and full three dimensional CFD-DNS simulations were undertaken to find out the wake topology and aerodynamic performances such as, dynamic lift, drag, pressure and friction coefficients, Strouhal numbers, boundary layer dynamics as well as the different instability modes. 3.- Wake past circular cylinder has been investigated to characterize the three-dimensional instability in the transitional regime when the boundary layer over the cylinder surface is laminar and shear layer separating the surface undergoes intermittently unstable displacements which manifests in the form of small time and length scale vortical structures. The wake in this flow regime is modestly turbulent and the streamwise velocity profiles across the flow stream feature typical U-shape profile. |
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