NDLI: Unsteady RANS and detached-eddy simulations of flow around a circular cylinder in ground effect

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Unsteady RANS and detached-eddy simulations of flow around a circular cylinder in ground effect

Content Provider	Semantic Scholar
Author	Nishino, Takafumi Roberts, Graham T. Zhang, Xin
Copyright Year	2008
Abstract	Abstract Unsteady Reynolds-averaged Navier–Stokes (URANS) simulations and detached-eddy simulations (DES) were performed of flow around a circular cylinder placed near and parallel to a moving ground, on which substantially no boundary layer developed to interfere with the cylinder. The results were compared with experiments previously reported by the authors to examine how accurately the URANS and DES can predict the cessation of von Karman-type vortex shedding and the attendant critical drag reduction of the cylinder in ground effect. The DES, which were performed in a three-dimensional domain with spanwise periodicity imposed, correctly captured the cessation of the vortex shedding, whereas both two- and three-dimensional URANS also predicted it but at a much smaller gap-to-diameter ratio compared with the experiments. The wake structures of the cylinder predicted by the DES were in good agreement with the experiments in both large- and small-gap regimes, and also in the intermediate-gap regime, where the DES captured the intermittence of the vortex shedding in the near-wake region. Based on the results obtained, further discussions are also given to the reason why the von Karman-type vortices in the URANS solutions incorrectly 'survived' until the cylinder came much closer to the ground.
Starting Page	18
Ending Page	33
Page Count	16
File Format	PDF HTM / HTML
DOI	10.1016/j.jfluidstructs.2007.06.002
Volume Number	24
Alternate Webpage(s)	https://eprints.soton.ac.uk/64092/1/JFS_Nishino.pdf
Alternate Webpage(s)	https://doi.org/10.1016/j.jfluidstructs.2007.06.002
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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