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, 1-20, [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 an excellent 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 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 osculation 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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- Faculties (pre 2018 reorg) > Faculty of Engineering and the Environment (pre 2018 reorg) > Southampton Marine & Maritime Institute (pre 2018 reorg)
- Current Faculties > Faculty of Engineering and Physical Sciences
- Current Faculties > Faculty of Engineering and Physical Sciences > School of Engineering > Aeronautical and Astronautical Engineering > Computational Engineering and Design Group
Aeronautical and Astronautical Engineering > Computational Engineering and Design Group - Current Faculties > Faculty of Engineering and Physical Sciences > School of Engineering > Aeronautical and Astronautical Engineering > Aerodynamics and Flight Mechanics Group
Aeronautical and Astronautical Engineering > Aerodynamics and Flight Mechanics Group
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