Dear Matt, I think waiting for 20 modes with the Arnoldi method is too much. I suggest seeking one mode and keeping the Krylov space of 16. You can do something like following : <P> kdim = 16 </P> <P> nvec = 1 </P> <P> nits = 500 </P> <P> evtol = 1e-06 </P> With regards Abhishek --------------------------------------------------------------------------------------- Abhishek Kumar Assistant Professor (Research) Centre for Fluid and Complex Systems Coventry University, Coventry CV15FB, UK Web: https://sites.google.com/view/abhishekkir --------------------------------------------------------------------------------------- On Sun, Mar 13, 2022 at 10:18 PM Matt Duran <matt.duran60@gmail.com> wrote:
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Hello Nektar++ community,
I recently have been running an adjoint stability simulation and am interested in the vortex shedding mode.
From the Strouhal number found in the literature I know the eigenmode of interest is the one highlighted below with a magnitude of 0.97 and a frequency of 0.731.
[image: image.png][image: image.png]
I have tried using a Krylov space of 40 and instructing Nektar to wait for the 20 modes with the highest magnitude to converge but I have no luck in getting the specific mode of interest to converge.
I was wondering whether there was some way I could narrow down the convergence criteria so the specific mode I need will converge, rather than these other 20 modes I’m getting. I have tried to also converge modes by the highest imaginary part but I can’t seem to get the specific mode I need.
Thank you,
Matt Duran
PhD student
University of Central Florida
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