Unsteady lifting-line theory and the influence of wake vorticity on aerodynamic loads

@article{Bird2021UnsteadyLT,
  title={Unsteady lifting-line theory and the influence of wake vorticity on aerodynamic loads},
  author={Hugh J. A. Bird and Kiran Ramesh},
  journal={Theoretical and Computational Fluid Dynamics},
  year={2021}
}
Frequency-domain unsteady lifting-line theory (ULLT) provides a means by which the aerodynamics of oscillating wings may be studied at low computational cost without neglecting the interacting effects of aspect ratio and oscillation frequency. Renewed interest in the method has drawn attention to several uncertainties however. Firstly, to what extent is ULLT practically useful for rectangular wings, despite theoretical limitations? And secondly, to what extent is a complicated wake model needed… 
Applying inviscid linear unsteady lifting-line theory to viscous large-amplitude problems
Unsteady Lifting-Line Theory (ULLT) is a low order method capable of modeling interacting unsteady and finite wing effects at low computational cost. Most formulations of the method assume inviscid
Applying Frequency-Domain Unsteady Lifting-Line Theory to Time-Domain Problems
TLDR
This paper transforms time-domain kinematics to the frequency domain, performs a convolution and then returns the results back to the time- domains, demonstrating how well-developed frequency-domain methods can be easily applied to time- domain problems.

References

SHOWING 1-10 OF 81 REFERENCES
Influence of aspect ratio on dynamic stall of a finite wing
The influence of aspect ratio (AR) on dynamic stall was studied by comparing experimental performance data and three-component velocity measurements acquired for wings of AR=3, 4, and 5, and an air...
General Theory of Aerodynamic Instability and the Mechanism of Flutter
The aerodynamic forces on an oscillating airfoil or airfoil-aileron combination of three independent degrees of freedom were determined. The problem resolves itself into the solution of certain
An immersed lifting and dragging line model for the vortex particle-mesh method
The numerical study of the wake of full-scale slender devices such as aircraft wings and wind turbine blades requires high-fidelity large eddy simulation tools. The broad spectrum of scales involved
On the leading-edge suction and stagnation-point location in unsteady flows past thin aerofoils
  • K. Ramesh
  • Physics
    Journal of Fluid Mechanics
  • 2020
Unsteady thin-aerofoil theory is a low-order method for calculating the forces and moment developed on a camber line undergoing arbitrary motion, based on potential-flow theory. The vorticity
  • AIAA J.
  • 2019
A Geometrically Non-Linear Time-Domain Unsteady Lifting-Line Theory
Dynamic Stall of a Finite-Aspect-Ratio Wing
An investigation of dynamic stall on a pitching NACA 0012 aspect ratio 4 wing is performed by means of high-fidelity wall-resolved large-eddy simulations. The flow parameters are freestream Mach nu...
Effect of Sweep on Dynamic Stall of a Pitching Finite-Aspect-Ratio Wing
An investigation of the effect of moderate sweep on three-dimensional (3D) dynamic stall of a pitching finite-aspect-ratio wing is performed by means of large-eddy simulations. The wings have an as...
Experimental and Computational Investigation of Transverse Gust Encounters
The flow over a flat-plate wing passing through a transverse gust was investigated using both experimental and computational methods. The gust created physically in a water-filled towing tank was f...
Influence of Aspect Ratio on Dynamic Stall of a Finite Wing
The influence of aspect ratio (AR) on dynamic stall was studied by comparing experimental performance data and three-component velocity measurements acquired for wings of AR=3, 4, and 5, and an air...
...
1
2
3
4
5
...