Modeling of Turbulent Flow over a Circular Cylinder using open source software openFoam - Tapa blanda

Sinopsis

Flow over a circular cylinder is a classic problem in fluid mechanics that has been extensively studied due to its relevance in various engineering and natural phenomena. This abstract provides an overview of the key characteristics and flow phenomena associated with the flow over a circular cylinder. The flow over a circular cylinder is characterized by the formation of vortices and the presence of boundary layer separation. The flow behavior depends on several parameters, including the Reynolds number (Re), which represents the ratio of inertial forces to viscous forces in the flow. At low Reynolds numbers (Re < 40), the flow is steady and symmetric, with the formation of two symmetric vortices known as Karman vortices shedding alternately from each side of the cylinder. These vortices result in periodic pressure fluctuations and drag forces on the cylinder. As the Reynolds number increases (40 < Re < 2,000), the flow becomes unsteady, and the Karman vortices exhibit irregular shedding patterns. The shedding frequency and the vortex shedding mode depend on the Reynolds number, resulting in a wide range of flow regimes and vortex shedding patterns. At higher Reynolds numbers (Re > 2,000), the flow becomes turbulent, characterized by chaotic and irregular vortex shedding. The flow separation region on the cylinder surface expands, resulting in increased drag forces. Turbulence intensifies the mixing of fluid layers and enhances heat and mass transfer rates. Researchers have extensively investigated the flow over a circular cylinder using experimental, numerical, and theoretical approaches. The understanding of flow characteristics and vortex shedding patterns has led to advancements in various fields, including aerodynamics, fluid-structure interaction, and marine engineering. In conclusion, the flow over a circular cylinder exhibits complex flow phenomena, including vortex shedding, flow separation, and turbulence, which are influenced by the Reynolds number. The study of this flow problem has contributed to the development of engineering applications and improved our understanding of fluid dynamics.

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