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- Title
Physics-Based Modeling of Viscous Ground Effect for Rotorcraft Applications.
- Authors
Jinggen Zhao; Chengjian He
- Abstract
A physics-based flow solver was used to address the challenging rotor wake and interference problems for rotorcraft operating in-ground effect. The rotor flow solver combines a viscous vortex particle method (VPM) with a viscous ground model. VPM is based on the incompressible Navier-Stokes equations and adopts a grid-free Lagrangian formulation. The viscous ground model is applied to efficiently implement the no-slip boundary condition in VPM for both stationary and moving ground surfaces. This paper discusses the formulation and implementation of the viscous ground model in VPM. The flow solver thus developed was used to simulate various aspects in the modeling of the rotor ground effect, which include the rotor tip vortex dynamics, the ground vortex formation, the rotor performance in hover and forward flight, the moving/stationary ground effect, and the rotor outwash predictions. In addition, the impact of the interference between the main/tail rotors and the ground vortex on the tail rotor performance was also studied.
- Subjects
VISCOUS flow; GROUND-cushion phenomenon; ROTORCRAFT; PARTICLE methods (Numerical analysis); LAGRANGIAN mechanics; ROTORS (Helicopters)
- Publication
Journal of the American Helicopter Society, 2015, Vol 60, Issue 3, p1
- ISSN
0002-8711
- Publication type
Article
- DOI
10.4050/JAHS.60.032006