A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Suppression of vortex shedding on a bluff body
Abstract Previous experimental observations suggest that a moving ground can be numerically simulated avoiding vorticity generation on it. In this research line the current paper presents a two-dimensional Lagrangian Vortex Method, which is able to analyze the vortex shedding suppression on a circular cylinder near a moving ground in a high Reynolds number flow of . The main purpose is to utilize numerical results to construct the instantaneous velocity and pressure fields for this kind of unsteady viscous flow. The analyses demonstrate that the physical mechanisms involved are associated with an additional circulation caused by the fluid viscosity and with the Venturi effect. Both of these effects are responsible for the increase in lift force as well as for the decrease in drag force acting on body surface.
Highlights Blockage effect: the mechanism responsible for the big and small peaks on the drag curve. Viscosity effect: it causes a change in the stagnation point, which arouses an increase in lift force. Venturi effect: it draws the counter-clockwise vortex structure downstream, which inhibits the boundary layer formation on the ground.
Suppression of vortex shedding on a bluff body
Abstract Previous experimental observations suggest that a moving ground can be numerically simulated avoiding vorticity generation on it. In this research line the current paper presents a two-dimensional Lagrangian Vortex Method, which is able to analyze the vortex shedding suppression on a circular cylinder near a moving ground in a high Reynolds number flow of . The main purpose is to utilize numerical results to construct the instantaneous velocity and pressure fields for this kind of unsteady viscous flow. The analyses demonstrate that the physical mechanisms involved are associated with an additional circulation caused by the fluid viscosity and with the Venturi effect. Both of these effects are responsible for the increase in lift force as well as for the decrease in drag force acting on body surface.
Highlights Blockage effect: the mechanism responsible for the big and small peaks on the drag curve. Viscosity effect: it causes a change in the stagnation point, which arouses an increase in lift force. Venturi effect: it draws the counter-clockwise vortex structure downstream, which inhibits the boundary layer formation on the ground.
Suppression of vortex shedding on a bluff body
Mendonça Bimbato, Alex (author) / Alcântara Pereira, Luiz Antonio (author) / Hiroo Hirata, Miguel (author)
Journal of Wind Engineering and Industrial Aerodynamics ; 121 ; 16-28
2013-06-30
13 pages
Article (Journal)
Electronic Resource
English
Suppression of vortex shedding on a bluff body
| Online Contents | 2013
Vortex shedding from bluff bodies
| British Library Conference Proceedings | 1998
Vortex shedding of bluff bodies: A review
| Tema Archive | 1999
Investigation of bluff body asymmetry on the properties of vortex shedding
| Online Contents | 2008