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8th Thermal and Fluids Engineering Conference (TFEC)
March, 26-29, 2023, College Park, MD, USA

NUMERICAL INVESTIGATION OF FLOW OVER A LOW ASPECT RATIO ELLIPTICAL CYLINDER NEAR A MOVING WALL

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DOI: 10.1615/TFEC2023.fnd.046041

要約

In this paper, flow around an elliptical cylinder located near a moving wall is investigated numerically. Numerical simulations are performed at an aspect ratio (AR) of 0.1 to analyze and compare the flow behavior with respect to cylinders having a higher AR. The distance of the cylinder from the moving wall in reference to its major-axis is characterized by the gap ratio (G/D), which is varied from 0.1 to 0.7 in the simulations. The Reynolds number (Re) based on free-stream velocity and major-axis is considered in the range 5-150. It is observed that the effect of low AR geometry on flow behavior in terms of separation, steady wake pattern as well as vortex shedding is more prominent at low gap ratios. For G/D = 0.1, a flow pattern with only a clockwise vortex is formed behind the upper part of the cylinder for Re up to 47. While the vortex remains stagnant in position, an increase in the recirculation length of the vortex is observed with an increase in Re. Concomitantly, there is no major variation in the upper separation angle with Re as compared to a steep increase in low Re range for higher AR cylinders. For G/D ≤ 0.5, the effect of low AR is manifested as an early onset of vortex shedding in terms of Re.