Turbulent flow around a square cylinder at Reynolds number 22,000: A DNS study
The turbulent flow around a square cylinder at Reynolds number 22,000 (based on the cylinder diameter and the inflow velocity) is studied by means of direct numerical simulation. An overview of the numerical methods and the methodology used to verify the simulation is presented with special emphasis...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2015 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/86080 |
| Acceso en línea: | https://hdl.handle.net/2117/86080 https://dx.doi.org/10.1016/j.compfluid.2015.09.013 |
| Access Level: | acceso abierto |
| Palabra clave: | Vortex shedding Turbulence Fluid dynamics Cylinders Reynolds number DNS square cylinder turbulence vortex shedding navier-stokes equations large-eddy simulation direct numerical-simulation fractional-step method symmetry-preserving discretization circular-cylinder hear-layer rectangular cylinders staggered grids bluff-body Turbulència Dinàmica de fluids computacional Cilindres Àrees temàtiques de la UPC::Enginyeria mecànica::Mecànica de fluids |
| Sumario: | The turbulent flow around a square cylinder at Reynolds number 22,000 (based on the cylinder diameter and the inflow velocity) is studied by means of direct numerical simulation. An overview of the numerical methods and the methodology used to verify the simulation is presented with special emphasis to determine the proper domain size and time-integration period. Then, the time-averaged flow results and turbulent statistics are discussed together with available experimental data showing a fairly good agreement. Finally, frequency analysis of velocity samples is used to analyze both the Kelvin-Helmholtz vortical structures produced by the flow separation at the leading edge of the cylinder and the Von Karman vortex shedding in the wake region. The former are observed more downstream compared with the experiments suggesting that transition to turbulence may occur later. However, comparison of the turbulent statistics in the near wall region indicates that transition is being well captured. |
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