Flow mechanism investigation on interference effect of two square cylinders in tandem arrangement

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (8) : 230-238.

FAN Xiaoyu1, QIN Hao1, SHANG Jingmiao2, HU Shuai1

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Abstract

The present paper is aimed at studying the flow field around the building group and reducing the loss caused by the interference effect in the engineering.The particle image velocimetry (PIV) and numerical simulation were used to study the flow characteristics and spatial structure of the flow field when the flow field of two square cylinders were disturbed under large Reynolds number and different spacing conditions.Characteristic parameters of flow field, such as lift and drag coefficient, vortex shedding frequency and Strauhal number, were analyzed to study the effects of different spacing on the two cylinders in a tandem arrangement.When Re=3.42×104, there is a critical spacing ratio of G=4, causing a sudden change in the flow field structure of two cylinders in the tandem arrangement.A bistable phenomenon appears in the flow field.When G<4, the average drag coefficient of the downstream square cylinder is negative, which is smaller than that of the single cylinder.The shielding effect is obvious at this point.The vortex shedding behind the upstream square cylinder was suppressed, and the average drag coefficient has a significant decrease, with a maximum drop of around 10%.When G>4, both the upstream and downstream square cylinders have seen vortexes shedding.Thse results can serve as references for engineering application.

Key words

two square cylinders in tandem arrangement / interference effect / particle image velocimetry（PIV） / Reynolds number / wind tunnel experiment / numerical simulation

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FAN Xiaoyu1, QIN Hao1, SHANG Jingmiao2, HU Shuai1. Flow mechanism investigation on interference effect of two square cylinders in tandem arrangement[J]. Journal of Vibration and Shock, 2020, 39(8): 230-238

References

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