Hi Guillermo, I am sorry we do not have that functionality currently implemented. For now we can only write out multiple files and calculate it from post processing. Best, Spencer On 6 Mar 2025, at 10:08, Guillermo Suárez <guillermo180395@gmail.com> wrote:  This email from guillermo180395@gmail.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. Hello, Is there a way to write the time derivatives of velocity and pressure to a file, possibly using FieldConvert? I am specifically interested in the incompressible solver. Thank you. Cheers, Guillermo _______________________________________________ Nektar-users mailing list Nektar-users@imperial.ac.uk https://mailman.ic.ac.uk/mailman/listinfo/nektar-users