Floquent stability
 

Hi, I am simulating a airfoil and found mode B instability in wake with spanwise wavelength approximately 0.8. But my supervisor is asking me to prove it. I do not know how to prove as I can visualize it through simulation and in papers I read. I read about Floquent stability but have no idea how to use it? Can anyone let me know how may I use it?and what else I can do to prove it?