Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Aerodynamic validation of vortex-based non-linear methods with leading-edge vortex shedding
Submission Author:
Tiago Monteiro , SP
Co-Authors:
Tiago Monteiro, Kiran Ramesh, Hugh Bird, Flávio Silvestre, ROBERTO GIL ANNES DA SILVA
Presenter: Tiago Monteiro
doi://10.26678/ABCM.COBEM2023.COB2023-2211
Abstract
The aerospace industry worldwide is seeking to develop \green aircraft" which are cleaner, quieter, and more efficient, based on demands for reduction of fuel burn, emission of pollutants and costs of operation. Aeroelastic behavior can impact these developments due to greater flexibility of lighter components, and non-linear aerodynamic models become necessary to simulate aeroelastic phenomena such as flutter. The LESP-modulated discrete vortex method introduces the Leading-Edge Suction Parameter (LESP) concept and presented an approach to allow for two-dimensional vortex-based methods to simulate the onset of leading-edge vortex (LEV) shedding and modulate its shedding during dynamic simulations. This concept was latter used to simulate limit-cycle oscillations on an airfoil at specific low-Reynolds number situations with good results. The same LESP concept was applied to the Unsteady Vortex-Lattice Method which allowed it to produce and modulate a LEV wake sheet in three-dimensional wings. This article aims to compare the two-dimensional and three-dimensional implementations of the LESP concept and study the three-dimensional effects that the UVLM expanded method produces when verified against LDVM and CFD for pitch-ramp-return motion of small and large aspect-ratio wing. The results show that the expanded UVLM produces very close results to LDVM for large aspect-ratios, where the wing tip effect is reduced, and was also capable of providing a good match for CFD results in small aspect-ratio wings. Therefore, both the two-dimensional and three-dimensional methods provide a good medium-fidelity method for low-Reynolds situations that can be applied to simulate flutter scenarios.
Keywords
Aerodynamics, Potential Flow, Leading-Edge Vortex, CFD
