首页|Visualization of 3D vortical structures around free-falling rigid and porous plates
Visualization of 3D vortical structures around free-falling rigid and porous plates
扫码查看
点击上方二维码区域，可以放大扫码查看
原文链接
NETL
NSTL
Springer Nature
This study investigates the vortical structure around rigid and porous plates using time-resolved three-dimensional (3D) particle tracking velocimetry (4D-PTV). The shape of plates was square, 2 cm by 2 cm with a thickness of 2 mm. The rigid plate was made of PMMA, and the porous plate was made of fabrics. Both plates were released into a water-filled tank, and then, 4D-PTV measurements were made during free fall motions. Both plates show a zigzag motion, while the rigid plate moves two times faster than that of the porous plate. The 3D vortical structures were obtained by Q criterion using 3D instantaneous velocity field data around the moving plate. Hairpin vortex structures are generated with the first slanting motion of both plates. The hairpin packet structure on the rigid plate resembles with that of turbulent boundary layer. With detachment of vortical structure from the plate edge, the direction change was happened and then turn to the opposite slanting motion. The moving rigid plate has the secondary hairpin vortex consisting of two rolled-up secondary vortices and a hairpin-like vortex, whereas the porous plate has only a secondary hairpin vortex due to slow movement in water.
School of Mechanical Engineering, Pusan National University, Busan 46241, Republic of Korea
School of Mechanical Engineering, Pusan National University, Busan 46241, Republic of Korea||Eco-Friendly Smart Ship Parts Technology Innovation Center, Pusan National University, Busan 46241, Republic of Korea
NETL
NSTL
Springer Nature
