Hi Wei, thanks for getting back to me. I found the error in the code of PulseWaveSystem.cpp and in the analytical solution of the inverse Jacobian in BetaPressureArea.cpp. I also found that the solver is hardcoded for junctions of 3 vessels or less and I am confident that the example Merging.xml is incorrect. I added trifurcations and confluences and currently I am trying to add junctions with multiple inlet/outlets. BW, Kai ________________________________ From: nektar-users-bounces@imperial.ac.uk <nektar-users-bounces@imperial.ac.uk> on behalf of Wei He <weiyh.he@gmail.com> Sent: Wednesday, July 3, 2024 15:33 To: 🌸那慢慢🌸 <2644878715@qq.com> Cc: nektar-users <nektar-users@imperial.ac.uk> Subject: Re: [Nektar-users] Adaptive SFD You don't often get email from weiyh.he@gmail.com. Learn why this is important<https://aka.ms/LearnAboutSenderIdentification> I can see the symmetry bcs for u is defined as D u=1, maybe you can set it as N u=0. Regards, Wei On Tue, 2 Jul 2024 at 12:31, 🌸那慢慢🌸 <2644878715@qq.com<mailto:2644878715@qq.com>> wrote: This email from 2644878715@qq.com<mailto:2644878715@qq.com> 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 nektar++ users and developers, I am using the Adaptive SFD method to calculate the flow field information when a square column experiences vortex shedding. But I have calculated many times according to the prompts in the user guide document, and the following two results are displayed: Vectors are lineary independent NaN found during time integration How should I set up an XML file to ensure correct calculation? I will attach my calculation file. I run the command ：IncNavierStokesSolver Cylinder-4.xml.gz Cylinder-4.xml Hongtao Cheng _______________________________________________ Nektar-users mailing list Nektar-users@imperial.ac.uk<mailto:Nektar-users@imperial.ac.uk> https://mailman.ic.ac.uk/mailman/listinfo/nektar-users