Lattice Boltzmann simulations of a pitch-up and pitch-down maneuver of a chord-wise flexible wing in a free stream flow | Zendy

Dewei Qi | Zendy; Guowei He | Zendy; Yingming Liu | Zendy

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Lattice Boltzmann simulations of a pitch-up and pitch-down maneuver of a chord-wise flexible wing in a free stream flow

Author(s) -

Dewei Qi,

Guowei He,

Yingming Liu

Publication year - 2014

Publication title -

physics of fluids

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.188

H-Index - 180

eISSN - 1089-7666

pISSN - 1070-6631

DOI - 10.1063/1.4866182

Subject(s) - physics , lattice boltzmann methods , stall (fluid mechanics) , wing , mechanics , chord (peer to peer) , reynolds number , angle of attack , airfoil , vortex , wing twist , lift to drag ratio , pitch angle , drag , lift coefficient , aerodynamics , classical mechanics , aerospace engineering , computer science , engineering , distributed computing , turbulence , thermodynamics , geophysics

A rapid pitch-up and pitch-down maneuver of a chord-wise flexible wing in a steady free stream is studied by using a lattice Boltzmann flexible particle method in a three-dimensional space at a chord based Reynolds number of 100. The pitching rates, flexibility, and wing density are systematically varied, and their effects on aerodynamic forces are investigated. It is demonstrated that the flexibility can be utilized to significantly improve lift forces. The flexible wing has a larger angular momentum due to elasticity and inertia and generates a larger leading edge vortex as compared with a rigid wing. Such lift enhancement occurs mainly during the pitch-down motion while a large stall angle is produced during the pitch-up motion. At a low pitch rate, the flexibility cannot improve lift. (C) 2014 AIP Publishing LLC.

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