Methods for Numerical Simulation of Leading Edge Vortex Flow

1987 ◽  
pp. 223-269 ◽  
Author(s):  
H. W. M. Hoeijmakers
Keyword(s):  
Numerical Simulation ◽  
Vortex Flow ◽  
Leading Edge ◽  
Leading Edge Vortex ◽  
Edge Vortex

Scaling law for the lift force of autorotating falling seeds at terminal velocity

2017 ◽  
Vol 835 ◽  
pp. 406-420 ◽  
Author(s):  
Injae Lee ◽  
Haecheon Choi
Keyword(s):  
Numerical Simulation ◽  
Lift Force ◽  
Lift Coefficient ◽  
Scaling Law ◽  
Leading Edge ◽  
Terminal Velocity ◽  
Leading Edge Vortex ◽  
Actuator Disk ◽  
Vortex Theory ◽  
Edge Vortex

We provide a scaling law for the lift force of autorotating falling seeds at terminal velocity to describe the relation among the lift force, seed geometry and terminal descending and rotating velocities. Two theories, steady wing-vortex theory and actuator-disk theory, are examined to derive the scaling law. In the steady wing-vortex theory, the strength of a leading-edge vortex is scaled with the circulation around a wing and the lift force is modelled by the time derivative of vortical impulse, whereas the conservations of mass, linear and angular momentum, and kinetic energy across the autorotating falling seed are applied in the actuator-disk theory. To examine the validity of the theoretical results, an unsteady three-dimensional numerical simulation is conducted for flow around an autorotating seed (Acer palmatum) during free fall. The sectional lift coefficient predicted from the steady wing-vortex theory reasonably agrees with that from the numerical simulation, whereas the actuator-disk theory fails to provide an estimation of the sectional lift coefficient. The weights of 11 different species of autorotating falling seeds fall on the scaling law derived from the steady wing-vortex theory, suggesting that even a simple theoretical approach can explain how falling seeds support their weights by autorotation once the circulation from a leading-edge vortex is properly included in the theory.

Numerical Simulation of the Streamwise Transport of a Delta Wing Leading-Edge Vortex

2021 ◽  
pp. 1-12
Author(s):  
Daniela G. François ◽  
Silvia Probst ◽  
Tobias Knopp ◽  
Cornelia Grabe ◽  
Tim Landa ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Delta Wing ◽  
Leading Edge ◽  
Leading Edge Vortex ◽  
Edge Vortex

Numerical simulation of leading-edge vortex flows

AIAA Journal ◽  
1986 ◽  
Vol 24 (2) ◽  
pp. 237-245 ◽  
Author(s):  
Donald P. Rizzetta ◽  
Joseph S. Shang
Keyword(s):  
Numerical Simulation ◽  
Leading Edge ◽  
Vortex Flows ◽  
Leading Edge Vortex ◽  
Edge Vortex
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