Vortex dynamics around pitching plates

@article{Jantzen2014VortexDA,
  title={Vortex dynamics around pitching plates},
  author={Ryan Jantzen and Kunihiko Taira and Kenneth Granlund and Michael V. Ol},
  journal={Physics of Fluids},
  year={2014},
  volume={26},
  pages={053606}
}
Vortex dynamics of wakes generated by rectangular aspect-ratio 2 and 4 and two-dimensional pitching flat plates in free stream are examined with direct numerical simulation and water tunnel experiments. Evolution of wake vortices comprised of tip, leading-edge, and trailing-edge vortices is compared with force history for a range of pitch rates. The plate pivots about its leading edge with reduced frequency from π/8 to π/48, which corresponds to pitching over 1 to 6 chord lengths of travel… Expand
Leading Edge Vortex Dynamics of Airfoils, Pitching Continuously at High Amplitudes
Airfoils pitching in the stalled regime have been of keen interest in recent years due to their desirable aerodynamic force characteristics. In this study, we are numerically investigating theExpand
Leading-edge vortex development on a maneuvering wing in a uniform flow
Vortices interacting with the solid surface of aerodynamic bodies are prevalent across a broad range of geometries and applications, such as dynamic stall on wind turbine and helicopter rotors, theExpand
Wake Dynamics of Finite Aspect Ratio Wings. Part II: Computational Study
As the second part of a three-part joint research, direct numerical simulations have been performed to study the three-dimensional wake dynamics of finite NACA0015 wings at a chordbased ReynoldsExpand
A Semi-Empirical Approach to Modeling Lift Production
Predicting force production on a wing operating in the low Reynolds number, high angle of attack flight regime is challenging, largely due to massive flow separation and the formation of strongExpand
Vortex dynamics and scalar transport in the wake of a flat-plate controlled by a vibrating trailing-edge flap
Abstract We investigate the onset and development of vortical flow disturbances introduced into the wake of a horizontally fixed flat-plate by means of the controlled motion of a trailing edge flap.Expand
Flow criticality governs leading-edge-vortex initiation on finite wings in unsteady flow
Abstract Leading-edge-vortex (LEV) formation often characterizes the unsteady flows past airfoils and wings. Recent research showed that initiation of LEV formation on airfoils in two-dimensionalExpand
Vorticity transport and the leading-edge vortex of a plunging airfoil
The three-dimensional flow field was experimentally characterized for a nominally two-dimensional flat-plate airfoil plunging at large amplitude and reduced frequencies, using three-dimensionalExpand
Vortex topology of a pitching and rolling wing in forward flight
Vortex topology is analyzed from measurements of flow over a flat, rectangular plate with an aspect ratio of 2 which was articulated in pitch and roll, individually and simultaneously. The plate wasExpand
The Effect of Pitching Frequency on the Hydrodynamics of Oscillating Foils
The effects of two different pitching frequencies (that is, Strouhal number, St) on the wake structure generated by two foils of aspect ratio 1.0 are examined numerically at a Reynolds number ofExpand
Understanding and controlling vorticity transport in unsteady, separated flows
Vortices interacting with the solid surface of aerodynamic bodies are prevalent across a broad range of geometries and applications, such as dynamic stall on wind turbine and helicopter rotors, theExpand
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 28 REFERENCES
On the Influence of Pitching and Acceleration on Vortex Dynamics Around Low-Aspect-Ratio Rectangular Wings
Abstract : In the present study, we use numerical simulations to investigate the three-dimensional flows over low-aspect-ratio at plates undergoing two canonical motions at low Reynolds numbers. TheExpand
Reynolds number effects on leading edge vortex development on a waving wing
The waving wing experiment is a fully three-dimensional simplification of the flapping wing motion observed in nature. The spanwise velocity gradient and wing starting and stopping acceleration thatExpand
Unsteady pitching flat plates
Abstract Direct force measurements and qualitative flow visualization were used to compare flow field evolution versus lift and drag for a nominally two-dimensional rigid flat plate executingExpand
Unsteady Lift Generation on Rotating Wings at Low Reynolds Numbers
The rotating wing experiment is a fully three-dimensional simplification of the flapping-wing motion observed in nature. The spanwise velocity gradient and the wing starting and stopping accelerationExpand
The leading-edge vortex and quasisteady vortex shedding on an accelerating plate
A computational inquiry focuses on leading-edge vortex (LEV) growth and shedding during acceleration of a two-dimensional flat plate at a fixed 10°–60° angle of attack and low Reynolds number. TheExpand
Three-dimensional flows around low-aspect-ratio flat-plate wings at low Reynolds numbers
Three-dimensional flows over impulsively translated low-aspect-ratio flat plates are investigated for Reynolds numbers of 300 and 500, with a focus on the unsteady vortex dynamics at post-stallExpand
On the evolution of the wake structure produced by a low-aspect-ratio pitching panel
TLDR
Flow visualization is used to interrogate the wake structure produced by a rigid flat panel of aspect ratio 0.54 pitching in a free stream at a Strouhal number of 0.23, which has the appearance of a three-dimensional Kármán vortex street. Expand
Numerical investigation of transitional flow over a rapidly pitching plate
A computational study of a plate undergoing high amplitude, pitch, hold, and return motions is presented. An implicit large eddy simulation (ILES) technique is employed to capture theExpand
The unsteady three-dimensional wake produced by a trapezoidal pitching panel
Abstract Particle image velocimetry (PIV) is used to investigate the three-dimensional wakes of rigid pitching panels with a trapezoidal geometry, chosen to model idealized fish caudal fins.Expand
Three-dimensional flow structure and aerodynamic loading on a revolving wing
A numerical study is conducted to examine the vortex structure and aerodynamic loading on a revolving wing in quiescent flow. A high-fidelity, implicit large eddy simulation technique is employed toExpand
...
1
2
3
...