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Spanwise correlation and coherent structures of separated flow around rectangular 5:1 cylinder
https://orcid.org/0000-0001-8415-4856
https://orcid.org/0000-0002-4205-4942
Abstract Spanwise correlation and coherent structure of separated flow around a rectangular cylinder with a side ratio of B/D = 5 (B: breadth; D: depth of cylinder) are numerically investigated by Large Eddy Simulation (LES) at Reynolds number Re = 22,000. The investigation utilizes one series of three-dimensional simulations with various spanwise lengths up to 10D at a grid resolution of D/16 and another series of simulations with various spanwise grid resolutions as small as D/40 at a spanwise length of 5D, in addition to a two-dimensional simulation. The results show that a spanwise coherent flow structure with a wavelength of roughly 1.4D, associated with longitudinal vortices, exists in the separated flow. A spanwise length of 3D seems long enough to eliminate the influence of spanwise coherent flow structure on the global aerodynamic parameters and leads to convergent simulation results. The spanwise correlations of sectional forces and surface pressures decay with the spanwise distance. A finer spanwise resolution results in decreased spanwise correlations in the investigated spanwise resolution region. The results also imply that it is necessary to consider the combined effects of multiple interacting factors such as numerical method, three-dimensional grid discretization and turbulence model when selecting the spanwise resolution.
Highlights The spanwise correlation and coherent flow structure of the rectangular 5:1 cylinder at Re = 22,000 are investigated. A spanwise coherent flow structure with a size of roughly 1.4D, associated with longitudinal vortices, exists in the flow. A spanwise length of 3D seems enough to eliminate the influence of coherent structure on the global aerodynamic parameters. The obtained spanwise correlation decreases with increase in spanwise resolution in the investigated resolution range.
Spanwise correlation and coherent structures of separated flow around rectangular 5:1 cylinder
https://orcid.org/0000-0001-8415-4856
https://orcid.org/0000-0002-4205-4942
Abstract Spanwise correlation and coherent structure of separated flow around a rectangular cylinder with a side ratio of B/D = 5 (B: breadth; D: depth of cylinder) are numerically investigated by Large Eddy Simulation (LES) at Reynolds number Re = 22,000. The investigation utilizes one series of three-dimensional simulations with various spanwise lengths up to 10D at a grid resolution of D/16 and another series of simulations with various spanwise grid resolutions as small as D/40 at a spanwise length of 5D, in addition to a two-dimensional simulation. The results show that a spanwise coherent flow structure with a wavelength of roughly 1.4D, associated with longitudinal vortices, exists in the separated flow. A spanwise length of 3D seems long enough to eliminate the influence of spanwise coherent flow structure on the global aerodynamic parameters and leads to convergent simulation results. The spanwise correlations of sectional forces and surface pressures decay with the spanwise distance. A finer spanwise resolution results in decreased spanwise correlations in the investigated spanwise resolution region. The results also imply that it is necessary to consider the combined effects of multiple interacting factors such as numerical method, three-dimensional grid discretization and turbulence model when selecting the spanwise resolution.
Highlights The spanwise correlation and coherent flow structure of the rectangular 5:1 cylinder at Re = 22,000 are investigated. A spanwise coherent flow structure with a size of roughly 1.4D, associated with longitudinal vortices, exists in the flow. A spanwise length of 3D seems enough to eliminate the influence of coherent structure on the global aerodynamic parameters. The obtained spanwise correlation decreases with increase in spanwise resolution in the investigated resolution range.
Spanwise correlation and coherent structures of separated flow around rectangular 5:1 cylinder
https://orcid.org/0000-0001-8415-4856
https://orcid.org/0000-0002-4205-4942
Abstract Spanwise correlation and coherent structure of separated flow around a rectangular cylinder with a side ratio of B/D = 5 (B: breadth; D: depth of cylinder) are numerically investigated by Large Eddy Simulation (LES) at Reynolds number Re = 22,000. The investigation utilizes one series of three-dimensional simulations with various spanwise lengths up to 10D at a grid resolution of D/16 and another series of simulations with various spanwise grid resolutions as small as D/40 at a spanwise length of 5D, in addition to a two-dimensional simulation. The results show that a spanwise coherent flow structure with a wavelength of roughly 1.4D, associated with longitudinal vortices, exists in the separated flow. A spanwise length of 3D seems long enough to eliminate the influence of spanwise coherent flow structure on the global aerodynamic parameters and leads to convergent simulation results. The spanwise correlations of sectional forces and surface pressures decay with the spanwise distance. A finer spanwise resolution results in decreased spanwise correlations in the investigated spanwise resolution region. The results also imply that it is necessary to consider the combined effects of multiple interacting factors such as numerical method, three-dimensional grid discretization and turbulence model when selecting the spanwise resolution.
Highlights The spanwise correlation and coherent flow structure of the rectangular 5:1 cylinder at Re = 22,000 are investigated. A spanwise coherent flow structure with a size of roughly 1.4D, associated with longitudinal vortices, exists in the flow. A spanwise length of 3D seems enough to eliminate the influence of coherent structure on the global aerodynamic parameters. The obtained spanwise correlation decreases with increase in spanwise resolution in the investigated resolution range.
Spanwise correlation and coherent structures of separated flow around rectangular 5:1 cylinder
Zou, Pengcheng (author) / Cao, Shuyang (author) / Cao, Jinxin (author)
2022-10-11
Article (Journal)
Electronic Resource
English
Spanwise correlation of aerodynamic forces on oscillating rectangular cylinder
| Online Contents | 2016