Drag reduction of ship airflow using steady Coanda effect

Xu, Kewei; Su, Xinchao; Bensow, Rickard; Krajnović, Siniša

doi:10.1016/j.oceaneng.2022.113051

Cited by 10 publications

(1 citation statement)

References 32 publications

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“…Moreover, a third dynamics, namely, pumping motion at higher Reynolds numbers using the same geometry was observed by Volpe et al (2015) with a normalized frequency of St ¼ fH=U 1 ¼ 0:08 (roughly 1.5-2.5 times vortex shedding timescale). Historical studies over the past few decades on the flow control strategies mainly concentrated on the alteration or suppression of flow separation (Choi et al, 2014;Grandemange et al, 2015;Perry et al, 2016;Minelli et al, 2019;Xu et al, 2022Xu et al, , 2023and Zhou et al, 2022). More recent attention has been focused on the suppression of the wake bi-stability, which is inspired by the 4%-9% drag reduction when the wake symmetric state is restored (Grandemange et al, 2014;Pavia et al, 2018;and Haffner et al, 2020).…”

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confidence: 99%

Comparison of flow characteristics behind squareback bluff-bodies with and without wheels

et al. 2023

Physics of Fluids

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The wake dynamics of two referenced variations of the squareback Windsor model with and without wheels are numerically studied by performing Improved Delayed Detached Eddy Simulation (IDDES). Numerical assessments are validated against publicly available experimental data. The focus of this study is on the wake states influenced by the wheels and the thick oncoming floor boundary layer. Results show that the addition of the wheels significantly changes the aerodynamic forces, the underbody flow, and the wake topology. The wake bi-stability is also enhanced with wheels in place due to the increased curvature of lateral shear layers in the near wake. However, the bi-stable behavior is largely suppressed when immersed in a thick boundary layer. These alterations depend on the degree of interaction between the wake recirculation and the bottom flow, and such degree is strongly affected by the underbody flow momentum. The evolution of low-order flow organizations and complementary spectral analysis highlight the differences in the coherent dynamics of the wake. The finding of the present work suggests that the wake bi-stability behind the squareback body can exist not only for a simplified geometry but also for a more realistic car with wheels in real-world upstream conditions.

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