Hi Jian, I'm afraid the mesh is a bit too large, but I have attached the working setup file below. It is likely that by comparing them you will solve the problem, but if you give me more info I'll be happy to help. Guglielmo ________________________________ From: nektar-users-bounces@imperial.ac.uk <nektar-users-bounces@imperial.ac.uk> on behalf of Jian Yu <yuj@buaa.edu.cn> Sent: 06 March 2023 13:19 To: nektar-users <nektar-users@imperial.ac.uk> Subject: [Nektar-users] On the implicit integration scheme for the compressible NS equations This email from yuj@buaa.edu.cn 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. Hi Everyone, We are trying to perform ILES for high Re flow using implicit solver of Nektar++. But we couldn't get the solver running. We feel it is the something wrong with configuration file. Could anyone please provide a valid demo case (including xml and mesh) to show how to use the implicit integration scheme with the compressible NS equations? Thanks! Best Jian