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Numerical/Experimental Investigation of Semi-Spherical Bumps on Separation Control and Lift Enhancement

Lotfikar, Mohammad Amin | 2023

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56685 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Javadi, Khodayar
  7. Abstract:
  8. The main purpose of the current study is to control the boundary layer of the flow passing over the wing and the lift force enhancement. In this research has been tried to introduce a new generation of passive flow control and use bumpy surface structures to control the separated flow and increase the aerodynamic efficiency. Therefore, the wing with the hawk bird’s airfoil section has been designated. Then, assuming a viscous, incompressible flow and a low Reynolds number range (about 2 × 105), the flow formation and boundary layer development on this wing has been investigated. Subsequently, bump structures have been settled on the upper surface of this wing. The numerical simulations have been performed on the new wing and the obtained results have been compared. The embedding of these bump structures with various scales and arrangements has been done by trial-and-error method in distinct positions. To obtain preliminary results, the Reynolds-averaged Navier-Stokes equations and the k-ω SST turbulence model have been applied. In order to a deeper comprehension of the governing physics of the flow, large eddy simulation with WALE model at the subgrid-scale has been applied. All the simulations of the flow have been executed with the finite volume method and using Ansys Fluent software. The results of the k-ω SST method show that by embedding these surface structures near the leading edge, the flow separation is delayed and the aerodynamic efficiency increases to 20.49%. However, the outcomes of using large eddy method demonstrate a decrease in aerodynamic efficiency by 5.85%. In conclusion, the visualization of streamlines of these two models has been implemented in the wind tunnel with the smoke
  9. Keywords:
  10. Lift Force ; Surface Structure Vibration ; Reynolds Average Navier-Stocks (RANS)Method ; Large Eddy Simulation (LES) ; Visualization ; Boundary Layer Control ; Quasi-Spherical Bumps ; Lift Force Enhancement

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