4 th International World Energy Conference, Kayseri, Turkey, 6 - 08 December 2024, pp.718-723
The
flow around a cylinder is a complex and critical phenomenon in fluid mechanics,
aerodynamics, and engineering design. Comprehending the flow dynamics around a
cylinder is essential for forecasting structural integrity, vibrational
characteristics, and load impacts in engineering applications, such as maritime
structures, bridge piers, pipelines, and wind engineering. Examining the flow
properties of a cylinder is crucial for optimizing designs to achieve enhanced
efficiency, stability, and safety. To accomplish this, both computational and
experimental methodologies are extensively employed to furnish a thorough
comprehension of the flow dynamics. This study examined the flow around a
circular cylinder through both numerical and experimental methods. The
influence of the base was disregarded to focus on the principal flow characteristics,
and the Reynolds number (Re) was established at 14,000, a regime characterized
by vortex shedding and turbulent flow behaviour. The cylinder diameter utilized
in the investigation was D = 50 mm, a standard measurement in experimental
validation studies. The experimental analysis employed various measurement
techniques. The smoke-wire technique was employed for flow visualization,
elucidating vortex shedding and boundary layer separation. The aerodynamic
forces exerted on the cylinder were quantified to assess lift and drag forces.
Velocity data were obtained using a hot-wire anemometer, and pressure
measurements were executed to ascertain the pressure distribution over the
cylinder's surface. These experimental techniques yielded significant data for
the validation of the numerical model. The study utilized the finite element
approach for numerical analysis, employing ANSYS FLUENT software. The flow was
simulated in a two-dimensional environment with the standard k-ε (SKE)
turbulence model, a well endorsed method for turbulent flow around cylindrical
structures. The governing equations of fluid dynamics were solved numerically,
and the outcomes were compared with the experimental data. A robust correlation
was noted between the experimental and numerical findings, indicating the
precision and dependability of the computational model.