Abstract
Two-dimensional, isothermal numerical computations are carried out using Ansys Fluent-18. Here, the flow is unsteady and incompressible past confined circular cylinder in a plane rectangular channel. A uniform inlet velocity profile is preferred; the Reynolds number varies in between 50 and 200. The blockage ratios (width of the channel to circular cylinder diameter) are 5, 10, 15 and 20. Flow characteristics like pressure and frictional drag coefficients, and Strouhal number (flow shedding frequency) are optimized. Fuzzy logic analysis has been used to model and predict the results of confined circular cylinder. A Mamdani fuzzy inference system with triangular membership function is used to be fuzzy sets. The results show that fuzzy model will predict the Strouhal number with 0.45% error. The present study recommends the lowest blockage ratio (highest blockage effect) and the highest Reynolds number combination is more suitable in flow shedding region in real-field applications.
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