Multi-Objective Optimization with Fuzzy Logic Analysis of Confined Flow Characteristics on Circular Cylinder
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ORIGINAL CONTRIBUTION
Multi-Objective Optimization with Fuzzy Logic Analysis of Confined Flow Characteristics on Circular Cylinder Rajendran Senthil kumar1 • Sethuramalingam Prabhu1 • Premalatha Vasudevan2
Received: 5 June 2020 / Accepted: 30 October 2020 Ó The Institution of Engineers (India) 2020
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.
q CDF U? FN CDp St Re F d SN C V S/
Keyword Frictional Pressure drag coefficients Strouhal number Principal component analysis Fuzzy logic analysis
The flow over circular cylinder occurs in many engineering fields like electronic components cooling, heat exchangers and aero dynamic fields. The electronic component such as capacitor, resistor and heat sink with circular cross section obstructs the flow, and also it is essential to evaluate the aerodynamic forces developed on off-shore and supporting structures in the processor. The researchers are analyzed and reported the flow behavior around the cylinder numerically and experimentally. Tritton [1] described the drag measurement on circular cylinders using quartz fibers in between Reynolds number 0.5 and 100. Comparisons are made with other experimental values and theoretical calculations. Kawaguti and Jain [2] studied unconfined circular cylinder between 1 and 100. Up to Reynolds number 50, steady state solutions exist to see beyond which steady
Abbreviations FT Tangential force BR Blockage ratio & Sethuramalingam Prabhu [email protected] 1
Department of Mechanical Engineering, SRM Institute of Science and Technology, Katankulathur, Chennai 603203, India
2
Department of Mathematics, St. Joseph’s College of Engineering, Chennai 600119, India
Fluid density Frictional drag coefficient Free stream velocities Normal pressure force Pressure drag coefficient Strouhal number Reynolds number Frequency of vortex shedding Diameter of the cylinder Signal noise ratio Grey relational grade Grey relational coefficient (U) x component of velocity and (v) y component of velocity
Introduction
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J. Inst. Eng. India Ser. C
state solutions could not been obtained. This issue w
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