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- W4283277637 abstract "The flow around roughened circular cylinders and the wake behind them were studied in a wind tunnel flow using the Particle Image Velocimetry (PIV) method. The Reynolds number ranged from 5140 to 11800, and the real diameter of the cylinders including surface roughness ranged from 15.06 to 17.34 mm. The flow properties and forces around the roughened cylinders was evaluated by means of Strouhal number and coefficient of drag. The wake was analysed by means of mean velocities along the cylinder centreline, its width and the Proper Orthogonal Decomposition (POD) method. The added surface roughness was found to decrease the wake length and increase the wake width at lower Reynolds numbers. At higher Reynolds numbers, the added surface roughness did not decrease the wake length, but did increase the wake width, although with less effect. The POD analysis showed changes in the higher modes of the flow. The kinetic energy of the first two modes covers up to 50% of the total kinetic energy; the first two modes in the case of the smooth cylinder have the lowest kinetic energy, whereas the first two modes in the case of the roughest cylinder have the highest kinetic energy. The similarity between the POD modes of the smooth and roughened cylinders might be due the fact that the actual Reynolds number range was below the transitional one." @default.
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- W4283277637 date "2022-11-01" @default.
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- W4283277637 title "Influence of surface roughness on the wake structure of a circular cylinder at Reynolds number 5 × 10<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline id=d1e1272 altimg=si3.svg><mml:msup><mml:mrow /><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msup></mml:math> to 12 × 10<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline id=d1e1280 altimg=si3.svg><mml:msup><mml:mrow /><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msup></mml:math>" @default.
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- W4283277637 doi "https://doi.org/10.1016/j.euromechflu.2022.06.003" @default.
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