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Direct numerical simulation of flow over a slotted cylinder at low Reynolds number
https://orcid.org/0000-0002-5295-635X
Highlights Flow control of slotted cylinder is investigated by direct numerical simulation. Flow through slits fluctuates over time and the fluctuation cycle depends on slit type. Wall shear stress and flow impact on slit wall should be considered in force evaluation. 4. Straight slit perpendicular to incoming flow plays the best role in suppressing forces. An alternate boundary layer suction and blowing is realized by the transverse slit.
Abstract Direct numerical simulation was conducted to investigate the flow past a slotted cylinder at low Reynolds number (Re) of 100. The slotting of cylinder affects the boundary layer separation, vortex formation position, recirculation region length and wake width, which are determined by the type of slit. The streamwise slit (SS1), T-shaped slit (SS3) and Y-shaped slit (SS4) act as passive jets, while the transverse slit (SS2) achieves an alternate self-organized boundary layer suction and blowing. The flow rate in slits fluctuates over time due to the alternate vortex shedding and fluctuating pressure distribution around the cylinder surface. One fluctuation cycle of flow rate is caused by a pair of vortices shedding for SS2, SS3 and SS4, while it is created by each vortex shedding for SS1. The wall shear stress and flow impact on the slit wall partly contribute to the hydrodynamic forces acting on the slotted cylinder. Taking into account the internal wall of slit, the transverse slit plays the best role in suppressing the fluid forces with drag reduction of 1.7% and lift reduction of 17%.
Direct numerical simulation of flow over a slotted cylinder at low Reynolds number
https://orcid.org/0000-0002-5295-635X
Highlights Flow control of slotted cylinder is investigated by direct numerical simulation. Flow through slits fluctuates over time and the fluctuation cycle depends on slit type. Wall shear stress and flow impact on slit wall should be considered in force evaluation. 4. Straight slit perpendicular to incoming flow plays the best role in suppressing forces. An alternate boundary layer suction and blowing is realized by the transverse slit.
Abstract Direct numerical simulation was conducted to investigate the flow past a slotted cylinder at low Reynolds number (Re) of 100. The slotting of cylinder affects the boundary layer separation, vortex formation position, recirculation region length and wake width, which are determined by the type of slit. The streamwise slit (SS1), T-shaped slit (SS3) and Y-shaped slit (SS4) act as passive jets, while the transverse slit (SS2) achieves an alternate self-organized boundary layer suction and blowing. The flow rate in slits fluctuates over time due to the alternate vortex shedding and fluctuating pressure distribution around the cylinder surface. One fluctuation cycle of flow rate is caused by a pair of vortices shedding for SS2, SS3 and SS4, while it is created by each vortex shedding for SS1. The wall shear stress and flow impact on the slit wall partly contribute to the hydrodynamic forces acting on the slotted cylinder. Taking into account the internal wall of slit, the transverse slit plays the best role in suppressing the fluid forces with drag reduction of 1.7% and lift reduction of 17%.
Direct numerical simulation of flow over a slotted cylinder at low Reynolds number
https://orcid.org/0000-0002-5295-635X
Highlights Flow control of slotted cylinder is investigated by direct numerical simulation. Flow through slits fluctuates over time and the fluctuation cycle depends on slit type. Wall shear stress and flow impact on slit wall should be considered in force evaluation. 4. Straight slit perpendicular to incoming flow plays the best role in suppressing forces. An alternate boundary layer suction and blowing is realized by the transverse slit.
Abstract Direct numerical simulation was conducted to investigate the flow past a slotted cylinder at low Reynolds number (Re) of 100. The slotting of cylinder affects the boundary layer separation, vortex formation position, recirculation region length and wake width, which are determined by the type of slit. The streamwise slit (SS1), T-shaped slit (SS3) and Y-shaped slit (SS4) act as passive jets, while the transverse slit (SS2) achieves an alternate self-organized boundary layer suction and blowing. The flow rate in slits fluctuates over time due to the alternate vortex shedding and fluctuating pressure distribution around the cylinder surface. One fluctuation cycle of flow rate is caused by a pair of vortices shedding for SS2, SS3 and SS4, while it is created by each vortex shedding for SS1. The wall shear stress and flow impact on the slit wall partly contribute to the hydrodynamic forces acting on the slotted cylinder. Taking into account the internal wall of slit, the transverse slit plays the best role in suppressing the fluid forces with drag reduction of 1.7% and lift reduction of 17%.
Direct numerical simulation of flow over a slotted cylinder at low Reynolds number
Zhu, Hongjun (author) / Zhao, Honglei (author) / Zhou, Tongming (author)
Applied Ocean Research ; 87 ; 9-25
2019-01-20
17 pages
Article (Journal)
Electronic Resource
English
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