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Sinusoidal oscillating flow over two tandem square cylinders: Three-dimensional large eddy simulations
https://orcid.org/0000-0001-5949-0233
https://orcid.org/0000-0003-3031-453X
https://orcid.org/0000-0002-6675-250X
Abstract Three-dimensional large eddy simulations are conducted to investigate the sinusoidal oscillating flow over the two tandem square cylinder at Reynolds number Re = 1000 and the spacing ratio L/D = 3.5 (L: center-to-center distance between the cylinders, D: cylinder width). The velocity U of sinusoidal oscillating flow is set as U = U 0 (1+A Rsin2π(f ∗ U 0/D)t), where A R is the velocity amplitude ratio varied from 0.05 to 0.50, and f ∗ (=f u D/U 0) is the non-dimensional frequency ranged from 0.05 to 0.15 with f u being the sinusoidal frequency. The main attention is paid on effects of A R and f ∗ on the flow structure and aerodynamic forces. The results indicate that the flow structures around the cylinders are sensitive to A R and f ∗, and classified into three patterns: reattachment, bistable, and coshedding patterns. At lower value of f ∗ = 0.05, the three flow patterns occur at 0 ≤ A R ≤ 0.25, A R = 0.30 and 0.35 ≤ A R ≤ 0.5, respectively; however, at larger value of f ∗ = 0.10 and 0.15, the occurrence of reattachment pattern is absent and the A R that the bistable pattern appears is advanced to A R = 0.1 at f ∗ = 0.10 and even no occurrence of bistable pattern at f ∗ = 0.15. Correspondingly, the wake structures, Strouhal number and aerodynamic forces exhibit a strong correlation with the flow pattern, leading to a mutation at the transition of flow pattern. Both cylinders in the coshedding flow experience greater mean-drag and fluctuating lift compared to those in the reattachment flow.
Highlights Effects of sinusoidal oscillating flow on two tandem square cylinders are investigated by conducting the three-dimensional large eddy simulations. The flow structures around the cylinders are sensitive to A R and f∗, and classified into three patterns: reattachment, bistable, and coshedding patterns. The flow structures, vortices shedding and fluid-dynamic forces vary according to changes in the flow pattern.
Sinusoidal oscillating flow over two tandem square cylinders: Three-dimensional large eddy simulations
https://orcid.org/0000-0001-5949-0233
https://orcid.org/0000-0003-3031-453X
https://orcid.org/0000-0002-6675-250X
Abstract Three-dimensional large eddy simulations are conducted to investigate the sinusoidal oscillating flow over the two tandem square cylinder at Reynolds number Re = 1000 and the spacing ratio L/D = 3.5 (L: center-to-center distance between the cylinders, D: cylinder width). The velocity U of sinusoidal oscillating flow is set as U = U 0 (1+A Rsin2π(f ∗ U 0/D)t), where A R is the velocity amplitude ratio varied from 0.05 to 0.50, and f ∗ (=f u D/U 0) is the non-dimensional frequency ranged from 0.05 to 0.15 with f u being the sinusoidal frequency. The main attention is paid on effects of A R and f ∗ on the flow structure and aerodynamic forces. The results indicate that the flow structures around the cylinders are sensitive to A R and f ∗, and classified into three patterns: reattachment, bistable, and coshedding patterns. At lower value of f ∗ = 0.05, the three flow patterns occur at 0 ≤ A R ≤ 0.25, A R = 0.30 and 0.35 ≤ A R ≤ 0.5, respectively; however, at larger value of f ∗ = 0.10 and 0.15, the occurrence of reattachment pattern is absent and the A R that the bistable pattern appears is advanced to A R = 0.1 at f ∗ = 0.10 and even no occurrence of bistable pattern at f ∗ = 0.15. Correspondingly, the wake structures, Strouhal number and aerodynamic forces exhibit a strong correlation with the flow pattern, leading to a mutation at the transition of flow pattern. Both cylinders in the coshedding flow experience greater mean-drag and fluctuating lift compared to those in the reattachment flow.
Highlights Effects of sinusoidal oscillating flow on two tandem square cylinders are investigated by conducting the three-dimensional large eddy simulations. The flow structures around the cylinders are sensitive to A R and f∗, and classified into three patterns: reattachment, bistable, and coshedding patterns. The flow structures, vortices shedding and fluid-dynamic forces vary according to changes in the flow pattern.
Sinusoidal oscillating flow over two tandem square cylinders: Three-dimensional large eddy simulations
https://orcid.org/0000-0001-5949-0233
https://orcid.org/0000-0003-3031-453X
https://orcid.org/0000-0002-6675-250X
Abstract Three-dimensional large eddy simulations are conducted to investigate the sinusoidal oscillating flow over the two tandem square cylinder at Reynolds number Re = 1000 and the spacing ratio L/D = 3.5 (L: center-to-center distance between the cylinders, D: cylinder width). The velocity U of sinusoidal oscillating flow is set as U = U 0 (1+A Rsin2π(f ∗ U 0/D)t), where A R is the velocity amplitude ratio varied from 0.05 to 0.50, and f ∗ (=f u D/U 0) is the non-dimensional frequency ranged from 0.05 to 0.15 with f u being the sinusoidal frequency. The main attention is paid on effects of A R and f ∗ on the flow structure and aerodynamic forces. The results indicate that the flow structures around the cylinders are sensitive to A R and f ∗, and classified into three patterns: reattachment, bistable, and coshedding patterns. At lower value of f ∗ = 0.05, the three flow patterns occur at 0 ≤ A R ≤ 0.25, A R = 0.30 and 0.35 ≤ A R ≤ 0.5, respectively; however, at larger value of f ∗ = 0.10 and 0.15, the occurrence of reattachment pattern is absent and the A R that the bistable pattern appears is advanced to A R = 0.1 at f ∗ = 0.10 and even no occurrence of bistable pattern at f ∗ = 0.15. Correspondingly, the wake structures, Strouhal number and aerodynamic forces exhibit a strong correlation with the flow pattern, leading to a mutation at the transition of flow pattern. Both cylinders in the coshedding flow experience greater mean-drag and fluctuating lift compared to those in the reattachment flow.
Highlights Effects of sinusoidal oscillating flow on two tandem square cylinders are investigated by conducting the three-dimensional large eddy simulations. The flow structures around the cylinders are sensitive to A R and f∗, and classified into three patterns: reattachment, bistable, and coshedding patterns. The flow structures, vortices shedding and fluid-dynamic forces vary according to changes in the flow pattern.
Sinusoidal oscillating flow over two tandem square cylinders: Three-dimensional large eddy simulations
Wang, Peiyuan (author) / Zhou, Qiang (author) / Li, Mingshui (author) / Cao, Shuyang (author)
2024-01-24
Article (Journal)
Electronic Resource
English
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