From my experience of computing airfoil flow, the leading mode maybe different if your base flow is not well converged. If you compare the eigenspetrum, I believe you will find there is no big difference. I think you can try a higher oder calculations or different Krylov space.

Regards,

Wei

On 18 Feb 2022, at 08:54, shan xiangjun <x_j_shan@outlook.com> wrote:

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Hi Everyone,

For 2D direct stability analysis of Nektar + +, when raising the NumSteps, I get different eigenvectors and I'm not sure which is correct (as shown in the figure).

TimeStep = 0.004                                           TimeStep = 0.004

NumSteps = 4250                                            NumSteps = 8250

<74181780A2BD44EFB8F01C3554F38D2E.png>  <872686C9FAC945B3B3D059AE5B7BA221.png>

Why does NumSteps affect the results and how do I set its value?

Looking forward to your reply!

Best regards,

Xiangjun Shan

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