HI Seiman, As Alex has suggested it is possible to use any initial condition but it can take a lot of iterations to get the eigenfunction to converge. Cheers, Spencer. On 2 Feb 2021, at 14:18, A.P. <k210@list.ru<mailto:k210@list.ru>> wrote: Selman, this is Channel-VCS.fld which contains the last u(n+1)=A(T)u(n) iteration from a previous solver run. The calculations from the zero inital condition may take very long time. Alex Proskurin. Вторник, 2 февраля 2021, 19:16 +07:00 от Selman Baysal <selmanbaysal@comu.edu.tr<mailto:selmanbaysal@comu.edu.tr>>: This email from selmanbaysal@comu.edu.tr<x-msg://104/compose?To=selmanbaysal@comu.edu.tr> originates from outside Imperial. Do not click on links and attachments unless you recognise the sender. If you trust the sender, add them to your safe senders list<https://spam.ic.ac.uk/SpamConsole/Senders.aspx> to disable email stamping for this address. Dear all, I’m a Ph.D. student in Istanbul Technical University and trying to learn more about Nektar++ to use it in my future doctorate thesis. I have done all the tutorials that given to users by Nektar++ (in official website) but confused about creating and/or obtaining a restart file (*.rst). For example, in Flow Stability – Channel tutorial, a restart file (Channel-VCS.rst in the Stability folder) was provided to users but i could not understand how it can be created or obtained for other simulations. I read its definition and understand the differences between Channel-VCS.bse and Channel-VCS.rst (the latter one contains eingenvalues/eingenmodes of the system). I would be very grateful if you could help me understand. Sincerely yours. Selman Baysal R. A. in Hydraulics Dept. of Civil Eng’g Çanakkale Onsekiz Mart University — ITU Civil Eng., BSc. ITU Coastal Sci. & Eng., MSc. Gsm: +905436180777 — _______________________________________________ Nektar-users mailing list Nektar-users@imperial.ac.uk<x-msg://104/compose?To=Nektar%2dusers@imperial.ac.uk> https://mailman.ic.ac.uk/mailman/listinfo/nektar-users _______________________________________________ Nektar-users mailing list Nektar-users@imperial.ac.uk<mailto:Nektar-users@imperial.ac.uk> https://mailman.ic.ac.uk/mailman/listinfo/nektar-users