Modelling of unsteady airfoil aerodynamics for the prediction of blade standstill vibrations

1. Modelling of unsteady airfoil aerodynamics for the prediction ofblade standstill vibrations

2. Contents 1. Introduction 2. Tools and methods 2.1 Procedure 2.2 2D and 3D N-S solvers and computational setup 2.3 Engineering model 3. CFD Results 3.1 Computations on a non-moving airfoil 3.2 2D computations in prescribed motion 3.3 3D computations in prescribed motion 4. Conclusions 5. Future work

3. 1. Introduction Blade standstill vibrations Vortex-induced Stall-induced

4. 1. Introduction Blade standstill vibrations Vortex-induced Stall-induced

5. Tools and methods 2.1 Procedure

6. Tools and methods 2.2 2D and 3D N-S solvers and computational setup 2D: 33·103 grid cells • 3D:13·106 grid cells

7. Tools and methods 2.3 Engineering model • Dynamic lift coefficient: • Dynamic drag coefficient:

8. Results 3.1 Computations on a non-moving airfoil • Vorticity magnitude • Complex flow • Separation • 3D: 24 degrees AOA • 2D: 26 degrees AOA • Re = 6·106

9. Results 3.2 2D computations in prescribed motion • Loop direction: counter clockwise

10. Results 3.3 3D computations in prescribed motion • Loop direction: counter clockwise

11. Conclusions

12. Future work • Thank you!