Dear Nektarers,

I am running a 3D direct stability analysis test case, the Re15000 Channel Flow from the tutorial (PPF_R15000_3D, ARPACK as the solver). As I understand, this is a BiGlobal stability analysis with 2D base flow and the spanwise wavenumber Beta. It means that for a given Beta, the Eigenvalues can be calculated. What I am seeking is the Eigenvalues under different spanwise wavenumber Beta, so I turn "Beta Set To Zero" as false (as in the PPF_R15000_3D). And the solver converged showing 4 Eigenvalues with Real and Imaginary part of each, with no information of Beta. How can I find the Eigenvalues under different spanwise wavenumber Beta?

Thank you very much.

Best Regards,

Xu