Unsteady Aerodynamics of Flapping Wing of a Bird Unsteady Aerodynamics of Flapping Wing of a Bird Unsteady Aerodynamics of Flapping Wing of a Bird  

Oleh:

Sachs, Gottfried ; Putra, Hendra Adi ; Moelyadi, M. Agoes

Jenis: Article from Journal - ilmiah nasional - terakreditasi DIKTI
Dalam koleksi: Journal of Engineering and Technological Sciences vol. 45 no. 01 (2014), page 047-060.
Topik: Dynamic grids; f unsteady aerodynamics. dynamic grids; flapping wing motion; flapping frequency; seagull eagull bird;
Fulltext: 619-1897-1-SM.pdf (629.15KB)

Isi artikel

The unsteady flow behavior and time characteristics of the flapping motion of a bird computational method. During wing surfaces and surrounding flow flow changes in the flow of flapping speed on unsteady aerodynamic load, two kinds of computational simulations were carried out, namely To mimic the movement of flapping path accorded dihedral angle and time. The computations of time based on the solution of applying the k-e turbulen computational domain around the model use provide more accuracy wing and body surfaces research, the seagull bird pointed wing-tips and movement, velocity contours as well as aerodynamic coefficients of motion of the bird at various flapping nsteady flow behavior and time-dependent aerodynamic flapping motion of a bird’s wing were investigated using a computational method. During flapping, aerodynamic interactions between bird surrounding flow may occur, generating local time-dependent flow field and aerodynamic load of birds. To study the of flapping speed on unsteady aerodynamic load, two kinds of computational carried out, namely a quasi-steady and an unsteady simulation To mimic the movement of the down-stroke and the upstroke of a bird, the ed to a sinus function, with the wing attitude changing in dihedral angle and time. The computations of time-dependent viscous flow on the solution of the Reynolds Averaged Navier-Stokes equations turbulence model. In addition, the discretization for computational domain around the model used multi-block structured grid accuracy in capturing viscous flow, especially in the vicinity of the wing and body surfaces, to obtain a proper wing-body geometry model. For this eagull bird was chosen, which has high aspect ratio wings with tips and a high camber wing section. The results include mesh movement, velocity contours as well as aerodynamic coefficients of the flapping motion of the bird at various flapping frequencies. dependent aerodynamic re investigated using a of flapping speed on unsteady aerodynamic load, two kinds of computational simulation. bird, the between bird dependent the effect with the wing attitude changing in dependent viscous flow were equations by model. In addition, the discretization for the block structured grid to especially in the vicinity of the body geometry model. For this which has high aspect ratio wings with esults include mesh flapping motion of the bird at various flaping frequencies.

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