Large eddy simulation of flow past stationary and oscillating square cylinders
Large eddy simulation of flow past stationary and oscillating square cylinders
Flow past stationary and oscillating square cylinders at Reynolds number 22,000 are studied using immersed boundary method (IBM) in large eddy simulation (LES), as the IBM is able to seamlessly simulate arbitrarily-moving bodies at a high efficiency. The square cylinders are forced to oscillate in a prescribed sinusoidal motion at reduced velocity 7.7, which corresponds to the resonance point. Two amplitude ratios A∕D = 0.05 and 0.1 based on a cylinder height D are studied. The accuracy of the current solver with the immersed boundary method is rigorously assessed against the reference data. To understand the effect of structural motion on the flow and turbulence, aerodynamics of the oscillating cylinder is compared with that of the stationary cylinder. It is found that the oscillation motion reduces the spanwise correlation of flow field and triggers earlier reattachment on the side faces. Consequently, more chaotic surface pressure is generated downstream the reattachment point, and a smaller correlation is observed between upper and lower surface pressures. This helps to fully understand the interaction of turbulence and the flow-induced motion of a structure.
Correlation, Immersed boundary method, Large eddy simulation, Oscillating square cylinders
1-20
Chen, Yongxin
634612c1-2eee-429e-b9f5-cea9fc105ffc
Djidjeli, Kamal
94ac4002-4170-495b-a443-74fde3b92998
Xie, Zheng-Tong
98ced75d-5617-4c2d-b20f-7038c54f4ff0
August 2020
Chen, Yongxin
634612c1-2eee-429e-b9f5-cea9fc105ffc
Djidjeli, Kamal
94ac4002-4170-495b-a443-74fde3b92998
Xie, Zheng-Tong
98ced75d-5617-4c2d-b20f-7038c54f4ff0
Chen, Yongxin, Djidjeli, Kamal and Xie, Zheng-Tong
(2020)
Large eddy simulation of flow past stationary and oscillating square cylinders.
Journal of Fluids and Structures, 97, , [103107].
(doi:10.1016/j.jfluidstructs.2020.103107).
Abstract
Flow past stationary and oscillating square cylinders at Reynolds number 22,000 are studied using immersed boundary method (IBM) in large eddy simulation (LES), as the IBM is able to seamlessly simulate arbitrarily-moving bodies at a high efficiency. The square cylinders are forced to oscillate in a prescribed sinusoidal motion at reduced velocity 7.7, which corresponds to the resonance point. Two amplitude ratios A∕D = 0.05 and 0.1 based on a cylinder height D are studied. The accuracy of the current solver with the immersed boundary method is rigorously assessed against the reference data. To understand the effect of structural motion on the flow and turbulence, aerodynamics of the oscillating cylinder is compared with that of the stationary cylinder. It is found that the oscillation motion reduces the spanwise correlation of flow field and triggers earlier reattachment on the side faces. Consequently, more chaotic surface pressure is generated downstream the reattachment point, and a smaller correlation is observed between upper and lower surface pressures. This helps to fully understand the interaction of turbulence and the flow-induced motion of a structure.
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Submitted date: 29 April 2019
Accepted/In Press date: 17 July 2020
e-pub ahead of print date: 28 July 2020
Published date: August 2020
Additional Information:
Funding Information:
The computations were performed on the IRIDIS supercomputer facility at the University of Southampton, UK. Yongxin Chen acknowledges the overseas studentship from the Faculty of Engineering and Physical Sciences, the University of Southampton.
Publisher Copyright:
© 2020 Elsevier Ltd
Keywords:
Correlation, Immersed boundary method, Large eddy simulation, Oscillating square cylinders
Identifiers
Local EPrints ID: 430618
URI: http://eprints.soton.ac.uk/id/eprint/430618
ISSN: 0889-9746
PURE UUID: 75702814-6753-42d6-ab27-78804f606990
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Date deposited: 07 May 2019 16:30
Last modified: 16 Mar 2024 03:40
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Yongxin Chen
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