HI Wasim, Have you seen this paper about boundary conditions: https://arc.aiaa.org/doi/10.2514/6.2014-2923 We have not yet looked at the symmetry conditions but night need it for another project. I am cc’ing Joao so he is aware of your interest too. Cheers, Spencer. On 20 Feb 2021, at 03:33, wasim sarwar <waseemsarwar121@hotmail.com<mailto:waseemsarwar121@hotmail.com>> wrote: This email from waseemsarwar121@hotmail.com<mailto:waseemsarwar121@hotmail.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 All, Good Morning, and wishing all of you very good day! I am trying to solve the problem of convergent-divergent nozzle with pressure at inlet and outlet. Does anyone have the idea how to setup the pressure inlet and pressure outlet boundary conditions in compressible Navier-Stokes solver. Also, give an idea of how-to setup the symmetry bc about x-axis. The input file is also attached herein for reference. Mant thanks in advance Wasim Sarwar UPC, Barcelona <Nozzle-input.xml>_______________________________________________ Nektar-users mailing list Nektar-users@imperial.ac.uk<mailto:Nektar-users@imperial.ac.uk> https://mailman.ic.ac.uk/mailman/listinfo/nektar-users