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Aerodynamic correlation between two diagonal square cylinders in various spacings and incidences
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DOI：10.1016/j.jweia.2026.106582.png)
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Abstract
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Wind-tunnel experiments are conducted to investigate the wind loading on two diagonal square cylinders at spacing ratios P/B = 1.75 to 5 (P: central spacing; B: side length), incidences α = 0° to 90°, and a Reynolds number of 8.0 × 104. The first single-street mode is observed at α = 0° to 10°, where the downstream cylinder is in the wake of the upstream one and exhibits lower mean drag and larger fluctuating drag, while both cylinders have a lower Strouhal number. For α > 10°, the second single-street mode, first twin-street mode, and second twin-street mode are found for small, moderate, and large spacings, respectively. For both cylinders, a strong fluctuating lift around α = 45° appears at large spacings but disappears for P/B < 3. At P/B = 3 to 5 and α = 60° to 90°, the flow interference is relatively weak, and the aerodynamics are similar to a single cylinder. Pearson correlation coefficient suggests a strong flow interference at α = 10° to 40° and P/B > 3, while time-lagged correlation analysis indicates the strong flow interference also appears at α = 0° to 10° and P/B < 3. The fluctuating pressure on the downstream cylinder is significantly larger than the upstream cylinder in most cases. At P/B = 5 and α = 60°, the negative pressure on the downstream cylinder is stronger than that on the upstream cylinder. A non-Gaussian pressure is observed near the lower and rear edges of both cylinders.
Keywords:
Two diagonal square cylinders
Flow interference
Wind tunnel test
Wind loading
Non-Gaussian
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