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Tushargh29 / transonic_shock_buffet

This repository is dedicated to the studienarbeit project of "Numerical investigation of 2D transonic shock-buffet around a NACA 0012-34 airfoil using OpenFOAM and flowTorch" undertaken by Mr. Tushar Gholap under the guidance of Dr. Andre Weiner.
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Adoption of final IDDES simulation setup and obtaining buffet onset angle of attack for constant Ma and Re numbers for NACA 0012-34 airfoil #24

Closed Tushargh29 closed 3 years ago

Tushargh29 commented 3 years ago

Hello sir,

I did adopt the final IDDES simulation case setup of Reduced Y Grading of 5000, using wall functions and 450 cells chordwise for NACA 0012-34 airfoil.

Then, I tried to obtained the onset buffet angle of attack for constant Re and Ma numbers specifically for NACA 0012 airfoil using the bisection method.

Thanks.

Best, Tushar

Tushargh29 commented 3 years ago

Here, I got the following results:

  1. alpha of 3.5 degrees = non-buffet case
  2. alpha of 4.5 degrees = buffet case

I will mail you the animation showing the buffet for NACA 0012-34 airfoil, please have a look at it there.

Thank you.

Best, Tushar

nonbuffet(3 5)_0012-34 buffet(4 5)_0012-34

AndreWeiner commented 3 years ago

I suggest placing the next point at 4.0° angle of attack. Best, Andre

Tushargh29 commented 3 years ago

Hello sir,

I tried 4 degrees of alpha last time, I was little skeptical about the proper and complete buffet development there so I moved to 4.5 degrees, I wanted to discuss this in the meeting.

Nevertheless, even 4 degrees of alpha is showing buffet and can be seen in Paraview visualization. I found the Cl fluctuations slightly less than 4.5 case so I thought of 4.5 degrees. But that was my observation might not be correct.

Thanks.

Best, Tushar buffet(4)_0012-34