Flutter speed index for flutter boundary

[jjywow]

Hello, Thank you in advance for your concern.

I often encountered papers presenting flutter boundary plots with Mach number versus flutter speed index as below.

Given an airfoil shape and Mach number, how can I obtain the flutter speed index as output in SU2?

Is there a specific solver for the flutter speed index?

How can I set the flutter speed index as output?

Or how can I get eigenvalues for stability eigenvalue problem for given aerodynamic conditions

Any guidance or tips will be appreciated!

Thank you for your help!

Sanchez, R., Kline, H.L., Thomas, D., Variyar, A., Righi, M., Economon, T.D., Alonso, J.J., Palacios, R., Dimitriadis, G. and Terrapon, V., 2016. Assessment of the fluid-structure interaction capabilities for aeronautical applications of the open-source solver SU2.

Opgenoord, M.M., Drela, M. and Willcox, K.E., 2018. Physics-based low-order model for transonic flutter prediction. AIAA Journal, 56(4), pp.1519-1531.

[bigfooted]

I do not know anything about flutter, but there is a configuration keyword FLUTTER_SPEED_INDEX and an example in the testcases folder Testcases/aeroelastic/aeroelastic_NACA64A010.cfg:

https://github.com/su2code/SU2/tree/master/TestCases/aeroelastic
https://github.com/su2code/TestCases/tree/master/aeroelastic

[jjywow]

Thank you for looking into this!