Abstract
In the present study, a three-dimensional seagull wing is pitched about the quarter chord axis in a sinusoidal way. To mimic gust-like realistic conditions, a time-varying velocity is imposed at the inlet. The Reynolds number (Re) based on root chord length is equal to 5000 with specified pitching amplitude and frequency. Unsteady numerical simulations are performed using Open Source Field Operation and Manipulation (OpenFOAM-8). The pitching motion is achieved using dynamic mesh utility interpolatingSolidBody motion solver, where the mesh near the wing does not morph but moves rigidly with respect to the wing, and deformation of mesh occurs away from the wing. The effects of gust parameters, i.e. IF and fg* has been studied on flow structure and force coefficients. To visualize highly unsteady and 3-D flow features across the wing, streamline topology has been shown. The effect on aerodynamic features like lift and drag is also considered. The nature of flow and the behaviour of coherent structures is predicted using marginal spectral distribution.
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Abbreviations
- α:
-
Pitch amplitude [rad]
- \(\alpha_{{\text{o}}}\):
-
Maximum pitch amplitude [rad]
- t:
-
Time [s]
- umean:
-
Mean velocity [m/s]
- Ρ:
-
Density [kg/m3]
- C:
-
Root chord length [m]
- P:
-
Pressure [kg/ms2]
- Re:
-
Reynolds number
- St:
-
Strouhal number
- CFL:
-
Courant–Friedrichs–Lewy Number
- IF:
-
Gust intensity factor
- fg*:
-
Non-dimensional gust frequency
- fp*:
-
Non-dimensional pitch frequency
- CLmean:
-
Mean lift coefficient
- CDmean:
-
Mean drag coefficient
- CDrms:
-
RMS of drag coefficient
- CLrms:
-
RMS of lift coefficient
- CD:
-
Drag coefficient
- CL:
-
Lift coefficient
- LEV:
-
Leading-edge vortex
- TEV:
-
Trailing-edge vortex
- TE:
-
Trailing edge
- LE:
-
Leading edge
- M:
-
Number of elements along the wing span
- n:
-
Number of elements along the chord-wise direction
- RMS:
-
Root mean square
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Acknowledgements
This work was performed using AQUA super cluster and the authors acknowledge the support of high performance computing facility of Indian Institute of Technology Madras, Chennai, 600036, India.
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Rana, J., Tiwari, S. (2024). Effect of Wind Gust on Flow Past Pitching Seagull Wing. In: Singh, K.M., Dutta, S., Subudhi, S., Singh, N.K. (eds) Fluid Mechanics and Fluid Power, Volume 2. FMFP 2022. Lecture Notes in Mechanical Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-99-5752-1_57
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DOI: https://doi.org/10.1007/978-981-99-5752-1_57
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