NUMERICAL ANALYSIS FOR 2D FLOW OVER DIFFERENT RATIO’S RECTANGULAR
Keywords:
Different ratio’s model, Rectangular cylinder, Numerical analysis, 2D simulation, Viscous laminar, Viscous K-epsilon modelAbstract
A fundamental fluid mechanics problem is that fluid flow over the solid body’s like a rectangular (square) cylinder, and it has been a popular research focus for many years. The simple two-dimensional solver implemented using a staggered structured mesh with used two models for analysis, one is viscous laminar for Re ≥40, and another model is viscous K-epsilon (2 equation) for 50≤ Re ≤1,000 where the blockage ratio is 0.01. For this simulation using FVM (Finite volume method) with a SIMPLE algorithm. Six different ratios rectangular cylinder used for finding the alliance between solid body’s length and flow characteristic. Where the length and width ratio were A/D = 0.25, 0.50, 1, 2, 3, and 4. Numerical results for the generated bubble’s width and length, the drag coefficient, velocity, and pressure reported. It observed that the generated bubble’s width and length decreasing with the increasing cylinder length at the same Reynolds number (3≤ Re ≥30). The drag coefficient decreases proportionally with the increasing Reynolds number. After passed the stable to unstable critical Reynolds number for each ratio, the drag coefficient started to increase. At Reynolds number 300, the flow over A/D = 0.25, 0.50, and 1 is unstable That time the flow over A/D = 2, 3, and 4 is stable. It also observed that flow stability also depends on the ratios of the rectangular cylinder. The current prediction for the square cylinder is in a good covenant with the previous numerical and experimental study.
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